<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Eric,<DIV><BR class="khtml-block-placeholder"></DIV><DIV>That was a fairly long lag between my post and your response. Hopefully you weren't reading my incredibly wordy post the entire time ;)</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I would be curious to know where/why you're on a dedicated network. Is this like internal use only? I have a hard time seeing how that really equates to what a user would typically experience.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>A handful of small points I forgot to make in my earlier post:</DIV><DIV>1) The TCP/IP stack configuration in the host device/machine can make a huge difference with EDGE which is by nature high latency - tweaking can improve performance a lot.</DIV><DIV>2) Sometimes the link to your device can be a problem, either in software or hardware. Bluetooth 1.x is limited to at most a megabit and I usually only clock it around 25 KB/sec to/from my phone and actually most devices. 2.4 GHz interference can that number far lower. Many interfaces, even if they are USB or something else, are set up as a "serial port" and you need to double check the baud rate is right. Having your baud rate set to 57,600 is a pretty big problem!</DIV><DIV>3) There was a small update made to EDGE a while back (I want to say "R2" but I could be wrong) that roughly halved latency. I have seen it implemented in PC cards only, and it really did what it claimed to do. I'm not sure about network support.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>As for link level compression, I don't think it would have a substantial impact on throughput. Realize that any video bitstream worth its salt already will be compressed. Adding another layer of compression will simply add a little latency and be unlikely to save any useful amount of bandwidth. However, the added latency is likely so small compared to latency associated with EDGE, it is not worth mentioning. I normally leave compression on - overall, it reduces the effect of EDGE's latency by making compressible data smaller.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>If you are having issues with EDGE performance, I would encourage you to really investigate the "flow" of the packets. Just watching a bandwidth graph on a computer using EDGE can be a very telling experience. Even better is to use a program like ethereal and monitor how packets arrive compared to how they are sent. I would encourage you to try a bunch of tests with this. Even just running a simple ping could shed a lot of light on your connection.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>If you hit interference or have a poor tower to tower handoff or something, you will see the data stop completely for up to 10-15 seconds sometimes, then resume. Interference also causes problems. You will rarely if ever get packets out of order with a connection like this, nor do you often get lost packets or "collisions" - the packets usually just get buffered and transmitted later if you are using a protocol like UDP or ICMP that doesn't have SYN/ACK packets that monitor response like TCP/IP. Obviously there is some limit to this, but I'm not sure what it is, and I suspect it depends on the client, the EDGE hardware, the network, etc.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Hopefully this helps a little. You'll probably want to explore your link level stuff some and see how much data you can reliably deliver, then once you get that under control, you can start really optimizing your video settings. There's a lot you can do there (we can go there when you're ready), but you've gotta have the transport worked out and a bandwidth budget before you should really try and optimize compression.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I will be interested to hear how your test comes out. I would be curious to know more about exactly what/why you're attempting to achieve here. Feel free to email me off-list.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>-Galen</DIV><DIV><BR><DIV><DIV>On May 29, 2006, at 1:55 AM, Melin Eric-AEM024 wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"><O:SMARTTAGTYPE namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"><DIV class="Section1"><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">Thanks for taking the time to give all these precious details.</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "> </SPAN></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">Since I will use a dedicated EDGE test network, I was confident at the beginning since I would not have to share the bandwidth with many users and the coverage would be good. However, the first results were quite disappointing …</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "> </SPAN></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">I will take the advice to use the H264 codec, I will also only transmit video and no sound.</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">One thing we are currently investigating is whether GPRS compression is activated for data, which would also make a difference.</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "> </SPAN></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">One thing to investigate also is the timeslot distribution on this test network, thanks for this advice.</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "> </SPAN></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">Eric</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; 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font-family: Arial; font-size: 13.3333px; ">Eric Melin</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN lang="FR" style="font-size:10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">Centre de Recherche de Motorola - Paris (CRM)</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">---------</SPAN><BR style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">Classification POPI:</SPAN><BR style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">[*] GBI General Business Information</SPAN><BR style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">[ ] MIUO Motorola Internal Use Only</SPAN><BR style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; ">[ ] MCP Motorola Confidential Proprietary</SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="2" color="navy" face="Arial"><SPAN style="font-size: 10.0pt;font-family:Arial;color:navy; color: rgb(0, 0, 128); font-size: 13.3333px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "> </SPAN><O:P style="color: rgb(0, 0, 128); font-family: Arial; font-size: 13.3333px; "></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="3" color="navy" face="Times New Roman"><SPAN style="font-size:12.0pt;color:navy; color: rgb(0, 0, 128); font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="color: rgb(0, 0, 128); font-family: Times New Roman; font-size: 16px; "> </SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P></DIV><DIV><DIV class="MsoNormal" align="center" style="text-align:center; font-family: Times New Roman; font-size: 16px; "><FONT size="3" face="Times New Roman"><SPAN style="font-size:12.0pt; font-family: Times New Roman; font-size: 16px; text-align: center; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; text-align: center; "></SPAN><HR size="3" width="100%" align="center" tabindex="-1"></SPAN></FONT></DIV><P class="MsoNormal"><B style="font-family: Times New Roman; font-size: 16px; font-weight: bold; "><FONT size="2" face="Tahoma"><SPAN style="font-size:10.0pt; font-family:Tahoma;font-weight:bold; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; font-weight: bold; ">From:</SPAN></SPAN></FONT></B><FONT size="2" face="Tahoma"><SPAN style="font-size:10.0pt;font-family:Tahoma; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; "> galenz@zinkconsulting.com [<A href="mailto:galenz@zinkconsulting.com">mailto:galenz@zinkconsulting.com</A>] </SPAN><BR style="font-family: Tahoma; font-size: 13.3333px; "><B style="font-family: Tahoma; font-size: 13.3333px; font-weight: bold; "><SPAN style="font-weight:bold; font-family: Tahoma; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; font-weight: bold; ">Sent:</SPAN></SPAN></B><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; "> samedi 20 mai 2006 23:52</SPAN><BR style="font-family: Tahoma; font-size: 13.3333px; "><B style="font-family: Tahoma; font-size: 13.3333px; font-weight: bold; "><SPAN style="font-weight:bold; font-family: Tahoma; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; font-weight: bold; ">To:</SPAN></SPAN></B><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; "> </SPAN><ST1:PERSONNAME w:st="on"><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; "><A href="mailto:vlc@videolan.org">vlc@videolan.org</A></SPAN></ST1:PERSONNAME><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; ">; </SPAN><ST1:PERSONNAME w:st="on"><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; ">Melin Eric-AEM024</SPAN></ST1:PERSONNAME><BR style="font-family: Tahoma; font-size: 13.3333px; "><B style="font-family: Tahoma; font-size: 13.3333px; font-weight: bold; "><SPAN style="font-weight:bold; font-family: Tahoma; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; font-weight: bold; ">Subject:</SPAN></SPAN></B><SPAN class="Apple-style-span" style="font-family: Tahoma; font-size: 13.3333px; "> Re: [vlc] Re: videolan over a gprs connection</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P></DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Eric,</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">I'm not the absolute expert on VLC, particularly when it comes to configuring streaming, but I am extremely familiar with GPRS and media compression. </SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">First lets talk about GPRS. Maybe this is redundant to some people, I'm not sure, but I think it might be worth explaining. GSM phone calls are allocated what's called "timeslots" - GSM works by breaking up the frequency into many channels, then each channel is split up into many timeslots. Basically, this means multiple phones can share the single channel by alternating which phone is broadcasting, in such a way that each timeslot represents the same amount of access to RF bandwidth.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">GSM voice calls normally use one timeslot up and one timeslot down. GPRS uses up to four up and four down simultaneously. The exact number is limited by your provider and your hardware. Depending on your signal strength, you will see anywhere from 8 to 20 kbps per timeslot (standard encoding rates: 8, 12, 14.4, 20 kbps). In my experience, I have rarely if ever seen 20 kbps, 12 kbps is a more reasonable assumption. If you are driving, reception makes a big difference, and unless you have amazing coverage and an antenna, you're unlikely to have a stable datarate the whole way.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Providers may limit the number of timeslots you can use, particularly if the network is very busy or you have an "unlimited" data plan. The policies may be determined at the local towers, based on predetermined rules or rules that vary with network load, so you can easily be driving and move from a tower allowing four slots to a tower only allowing two slots. You also need to check up on your hardware (use a site like </SPAN><A href="http://phonescoop.com"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Times New Roman; font-size: 16px; -khtml-text-decorations-in-effect: underline; ">http://phonescoop.com</SPAN></A><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">/ ) because most hardware will have some limitations. Usually you'll see it noted like this "4+1" which means four downstream timeslots (so 32 to 80 kbps depending on signal quality.) Sometimes you'll see it listed as "Class 4" which has a distinct meaning. (A quick google search will turn up plenty of pages with elaborate tables about this.) Many classes also have a maximum limit on slots - for example, class 10 allows 4 down and 2 up, but no more than 5 simultaneous connections, so (assuming no network restrictions) you will run at 3+2 or 4+1.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Although this only applies in some areas, particularly the </SPAN><ST1:COUNTRY-REGION w:st="on"><ST1:PLACE w:st="on"><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">US</SPAN></ST1:PLACE></ST1:COUNTRY-REGION><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">, there is another protocol called "EDGE" which works just like GPRS but uses a more efficient RF encoding approach allowing better throughput. But all the same ideas apply, and it still works within the same timeslots. Being in the </SPAN><ST1:COUNTRY-REGION w:st="on"><ST1:PLACE w:st="on"><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">US</SPAN></ST1:PLACE></ST1:COUNTRY-REGION><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">, I use EDGE regularly, sometimes moving in excess of a GB of data per month. With a class 10 device I have certainly seen 200 kbps downstream many times, but the upstream is not nearly so great.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Sorry for this lengthy email, but GPRS really is that complex. And we've only discussed the theory so far :)</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">As a general rule, you will want to ensure you have the best possible signal quality for a GPRS link. However, no matter what you do, even if you're in a fixed location, you're likely to still see some variation in signal quality. Interference, varying atmospheric conditions, even vehicles and people blocking signal can affect it. If you're moving, it's almost certain that your data rate will be varying, even if you have a fairly large antenna.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">All of this will inevitably cause your data rate to vary, and this is what makes streaming particularly maddening on GPRS. Your data rate may drop to 32 kbps, then jump to 80 kbps as soon as you come around a corner and handoff to a new tower. </SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">The actual data is also in question. If you sit there running a ping, you normally will never drop a packet - GPRS is generally quite good at getting packets through reliably. It's just a question of timing! With an idle GPRS connection you may be getting ping times between 500 and 1200 ms, and literally one packet may take 500 ms and the next 1200 ms. Packets seem to always be delivered in a sequential manner - this is handled like a PPP link on most computers - so the busier the link, the higher the latency overall.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Sometimes, you'll get bursts of interference (i.e. tower handoffs, other interference) which interrupt the connection and cause packets to queue up, but the sequential delivery method means that everything generally does get through, unless you have an extreme situation where the packets can't be queued up anymore. (I'm not quite sure what defines these parameters, but it will happen.) Packet dropping on a GPRS connection isn't generally like ethernet or 802.11b/g where you have a rather consistant level of drops, due to a bad link or collisions. With GPRS, Similarly, if you take a call most hardware pauses the connection and queues up packets to a certain extent. I'm not entirely sure at what level the queueing is implemented, but I have seen packets queued for 15 minutes or more during a call, and up to 10 or 15 seconds during a connection, particularly if I'm driving.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Another interesting note - it takes more energy to send data than to receive it, by a good bit. You may be shocked at how fast you go through power on your phone and (in many cases) how hot it gets when you're maxing out the upload for long periods of time. I've even seen a number of phones and cards overheat and freeze or act strange when uploading a lot, particularly with poor signal strength where the phone has to broadcast near maximum power.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">The result of all these factors is that GPRS seriously sucks for streaming. If you are going to try it, I would suggest you use substantial buffers, at least several seconds of content or more, if you want a smooth experience, or even "progressive download" of the video if it can be pre-recorded. If you want live, you may just want to use RTSP and realize that you'll have places where it drops and stutters, particularly if both client and server are mobile. (Although you said only the client was mobile.) The very limited bandwidth is also very challenging. A typical good case scenario (4 + 1 at 12 kbps each = 48 kbps down, 12 kbps up) is very similar to streaming over a 56k modem with lots of latency. I'm sure a lot has been written about delivering content to 56k users - and the bottom line is that nothing looks very good, particularly in the days of people watching 720p, 1080i, even 1080p video all over the place.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">I would concur with the earlier poster that your provider may filter ports or protocols, but I'm sure that can be negotiated. I have in some cases simply setup an ssh tunnel over WAP ports or other allowed ports to enable connectivity on an otherwise restricted network connection.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">As for actual compression, the leader of the pack right now is H.264 from the x264 project. Just like other projects like XviD, it's always improving in quality, so be sure you have a recent version for the encoding machine. Be sure to take advantage of all the features it offers to help reduce bitrate - CABAC, etc. If you don't need the video live, I would strongly suggest two-pass encoding for better quality. This would go ideally with the progressive download model, which is (in my opinion) the most preferred means for delivering smooth playback on a mobile. You just end up a waiting a little longer for it to start if your connection is particularly slow - the variable nature of mobile connections is maddening like that.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">The audio is an interesting one. The exact codec you want to use is a little variable, sometimes one codec is actually better suited for a certain type of content, and different content may require vastly different settings or bitrates to sound good. I've been most impressed with AAC-HE ("AAC High Efficiency" - aka AACplus or AAC+) which has some quite impressive performance at low bitrates. I'm not sure if VLC can encode AAC-HE yet, however, but I know it can decode it. Alternatively, I would suggest you look at Ogg Vorbis or regular AAC (usually "AAC Low Complexity"). MP3 is an older audio codec, and has a hard time getting the quality of these newer codecs, particularly at low bitrates, so I would not recommend it.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Hopefully this gives you a start on figuring out how to stream content via GPRS with some modicum of quality. Honestly, I don't know if you'll ever get anything really satisfying out of it. The premier service (at least in the </SPAN><ST1:COUNTRY-REGION w:st="on"><ST1:PLACE w:st="on"><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">US</SPAN></ST1:PLACE></ST1:COUNTRY-REGION><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">) for streaming content via mobile networks is MobiTV ( </SPAN><A href="http://www.mobitv.com"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Times New Roman; font-size: 16px; -khtml-text-decorations-in-effect: underline; ">http://www.mobitv.com</SPAN></A><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">/ ) and they've done a fairly good job of pulling it off - but even that isn't great. </SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">I have tested MobiTV on my class 10 EDGE device with excellent signal (the best case scenario, basically), plenty of CPU (200 MHz ARM CPU), high res bright screen (320x320), high quality stereo headphones, etc and I found it to be pretty terrible - I have unlimited data, and even it were completely free for the service, I don't think I would watch it. I'd sooner listen to a 64 kbps AAC-HE stream of the audio and just hear it in good quality, instead of the tinny sounding voices on MobiTV and distorted, choppy video images. This is what MobiTV calls a "high frame rate experience" device. GPRS only devices are called "standard frame rate experience" and really look even worse.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Fortunately, I believe there is substantial room for doing better than MobiTV, but it probably would require the progressive download approach using multi-pass VBR encoded content and you spending a great deal of time tweaking all the compression settings to maximize the quality.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">I think that mobile video applications are only going to take off when we see wide deployment of UMTS (WCDMA), but that's still a ways away from any substantial penetration in the US market, and internationally suffers from a quagmire of different frequencies and modes that phones must now support to be fully "international" friendly (US UMTS is rolling out at 850 MHz and 1900 MHz, most other UMTS runs at 2100 MHz, and GSM/GPRS/EDGE is deployed at 850, 900, 1800, and 1900 MHz around the world, so now we need a five-band seven-mode phone to work fully internationally! ) Fortunately, mobile bandwidth is only going up while compression is only getting better and better, not to mention that CPU speeds on mobiles are also improving, so the situation is just getting better with time.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Interestingly, in the </SPAN><ST1:COUNTRY-REGION w:st="on"><ST1:PLACE w:st="on"><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">US</SPAN></ST1:PLACE></ST1:COUNTRY-REGION><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> we are migrating to all DTV / HDTV and we use ATSC which uses 8VSB modulation, which precludes the reception of HDTV while in motion due to it being very time sensitive and the doppler effect. Currently, analog is suitable for small handheld devices, but mobile displays are now ready for HD content (particularly in-vehicle displays) and the FCC is forcing ALL broadcasters to switch to DTV in the near future. Both of these factors will soon make other mobile networks the only means of delivering TV content to mobile viewers, so I foresee this market is going to quickly become quite competitive. There is an E-VSB protocol on the table from the ATSC commission, standardized in 2004, but I don't know of any broadcasters that have adopted it, and I'm not sure how easily E-VSB can be integrated into existing broadcast equipment, and TV stations are wary of spending even more in digital infrastructure after all they've spent by FCC mandate.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">As you can tell, I do have a bit of an interest in this matter and I would actually be curious to see what you end up working out in this arena.</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">-Galen</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><A href="mailto:galenz@zinkcconsulting.com"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Times New Roman; font-size: 16px; -khtml-text-decorations-in-effect: underline; ">galenz@zinkcconsulting.com</SPAN></A><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P><DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">On May 20, 2006, at 4:28 AM, Antoine Roussel wrote:</SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P><P class="MsoNormal" style="margin-bottom:12.0pt; font-family: Times New Roman; font-size: 16px; "><FONT size="3" face="Times New Roman"><SPAN style="font-size:12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Hi,</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">I don't know exactly your test configuration so there are two answers :</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">If you have a "perfect network" between your 2 GPRS devices, you can send your data over UDP. By using UDP protocol, there isn't transmission control or stat return from the client (indeed it isn't "connection oriented" like TCP). </SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">If you use an operator network, this will be trickier... Some of them allow only few ports and few protocols. In this case, you should use the http protocol. This is a problem, as you said, because of the low upload bandwidth. </SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Concerning the video codec, the best ratio quality/bit rate is gained by h264. For the audio codec, you an use MP3 or ogg for instance.</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">If you succeed, I would be interested in your experience feedback.</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Antoine</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">-- </SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">_______________________________________</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Antoine Roussel</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Telecom </SPAN><ST1:CITY w:st="on"><ST1:PLACE w:st="on"><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">Lille</SPAN></ST1:PLACE></ST1:CITY><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> Student</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">CV : </SPAN><A href="http://cv.antoine-roussel.info"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Times New Roman; font-size: 16px; -khtml-text-decorations-in-effect: underline; ">http://cv.antoine-roussel.info</SPAN></A><BR style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">_______________________________________</SPAN><BR style="font-family: Times New Roman; font-size: 16px; "><BR style="font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P><DIV><P class="MsoNormal"><SPAN class="gmailquote"><FONT size="3" face="Times New Roman"><SPAN style="font-size:12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">On 5/19/06, </SPAN><ST1:PERSONNAME w:st="on"><B style="font-family: Times New Roman; font-size: 16px; font-weight: bold; "><SPAN style="font-weight:bold; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; font-weight: bold; ">Melin Eric-AEM024</SPAN></SPAN></B></ST1:PERSONNAME><B style="font-family: Times New Roman; font-size: 16px; font-weight: bold; "><SPAN style="font-weight:bold; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; font-weight: bold; "> </SPAN></SPAN></B><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "><</SPAN><A href="mailto:erik@motorola.com"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Times New Roman; font-size: 16px; -khtml-text-decorations-in-effect: underline; ">erik@motorola.com</SPAN></A><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; ">> wrote:</SPAN></SPAN></FONT></SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><DIV><DIV link="blue" vlink="purple"><DIV><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt;font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">Hi</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><DIV><P class="MsoNormal"><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt; font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; "> </SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P></DIV><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt;font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">I'm trying to use videolan for streaming a video between 2 laptops (one vlc server and one vlc client), the client using a gprs connection to connect to the server.</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt;font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">I was wondering which would be the most appropriate codecs to use to accommodate the low bandwidth available over gprs (in particular, since the uplink from client to server is particulary low, is there a particular mode in which the videolan signalling from client to server would be minimal).</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><DIV><P class="MsoNormal"><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt; font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; "> </SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P></DIV><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt;font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">Thanks</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt;font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">Eric</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><DIV><P class="MsoNormal"><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt; font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; "> </SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P></DIV><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN lang="FR" style="font-size:10.0pt;font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">Eric Melin</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN lang="FR" style="font-size:10.0pt;font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">Centre de Recherche de Motorola - Paris (CRM)</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><P style="font-family: Times New Roman; font-size: 16px; "><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt;font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">---------</SPAN><BR style="font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">Classification POPI:</SPAN><BR style="font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">[*] GBI General Business Information</SPAN><BR style="font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">[ ] MIUO Motorola Internal Use Only</SPAN><BR style="font-family: Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; ">[ ] MCP Motorola Confidential Proprietary</SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P><DIV><P class="MsoNormal"><FONT size="2" face="Arial"><SPAN style="font-size:10.0pt; font-family:Arial; font-size: 13.3333px; "><SPAN class="Apple-style-span" style="font-family: Arial; font-size: 13.3333px; "> </SPAN></SPAN></FONT><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV><DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN><O:P style="font-family: Times New Roman; font-size: 16px; "></O:P></SPAN></FONT></P></DIV></DIV></DIV></DIV></DIV></DIV><P class="MsoNormal"><FONT size="3" face="Times New Roman"><SPAN style="font-size: 12.0pt; font-family: Times New Roman; font-size: 16px; "><O:P style="font-family: Times New Roman; font-size: 16px; "><SPAN class="Apple-style-span" style="font-family: Times New Roman; font-size: 16px; "> </SPAN></O:P></SPAN></FONT></P></DIV></DIV></O:SMARTTAGTYPE></O:SMARTTAGTYPE></O:SMARTTAGTYPE></O:SMARTTAGTYPE><BR class="Apple-interchange-newline"></SPAN></BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>