[streaming] Re: Streaming mp4+AAC to mobile phones

PERET Pierre-Hugues ph.peret at free.fr
Sat Dec 10 15:35:49 CET 2005 

After hours of compiling and testing :

ffmpeg with faac and amr_nb support.
transcoding and streaming h263video or mpeg4 video with AAC
-------------------------------------------------------------------------------------------------------------
* can play with QTPlayer on windows
* only video on realplayer symbian OS (player complains about sound is not 
readable)

transcoding and streaming h263video or mpeg4 video with AMR narrow band
-------------------------------------------------------------------------------------------------------------
* can play with QTPlayer on windows with horrible sound
* can play on Realplayer symbian OS but sound is unaudible (like volume = 
0) (player doesn't complain about sound)

Note that AMR is transcodable only with these settings : samplerate=8000 , 
channels=1 . So you can turn into trouble for transcoding some sound format 
with 2 channels (eg wma2 ). And this makes impossible to have good sound 
using amr.

Any suggests are welcome !



At 09:03 10/12/2005 +0100, you wrote:
>Wow !!
>installed helix client on windows, and it plays video AND audio.
>
>So it IS a plaform or operator issue .
>trying now to compile ffmpeg with amr support .
>
>
>"Qui vivra verra !"
>
>
>
>At 08:40 10/12/2005 +0100, you wrote:
>>I tried streaming mp4+aac over http, but the mobile phone doesn't 
>>recognize the stream , in fact it's the operator that dosen't recognize 
>>it,if i put http://myserver:port , my operator says "bad url" . that's 
>>too weird ...
>>I didn't try to play the streamed mp4+aac (rtsp) with real player or 
>>helix player on my PC, so i'll try this to know if it's a format/hinting issue.
>>
>>
>>At 11:19 09/12/2005 -0800, Torben Knerr wrote:
>>
>>>On 12/9/05, PERET Pierre-Hugues 
>>><<mailto:ph.peret at free.fr>ph.peret at free.fr> wrote:
>>>>As i can stream a mp4 + AAC file from vlc+DSS to QTplayer on windows, i 
>>>>don't know why i cannot play it on the mobile phone, maybe it's a 
>>>>player issue (Realplayer) .
>>>
>>>Isn't Realplayer based on the Helix DNA Client (described in the link 
>>>you gave)? If that is true, then only amr-wb/samr will be supported over 
>>>rtsp according to their description. AAC+ would be supported via HTTP 
>>>streaming, though. Can VLC encode AAC+?
>>>
>>>>Helix player can be recompiled with mpeg4 support (i'm not able at this 
>>>>time to do this). But if someone can compile helix player with mpeg4 
>>>>support for symbian OS, i would be glad to test it, but it think AAC 
>>>>cannot be streamed with mpeg4 in rtsp or http, anyone can confirm this ?
>>>
>>>I'm sure it can be streamed (as it works fine with QTPlayer etc.), but 
>>>it seems that Realplayer/Helix DNA Client for mobile is just not able to 
>>>play it, which sucks :(
>>>
>>>>if i have time, i will recompile vlc with samr support. but it will not 
>>>>be until next week.
>>>
>>>Btw: did you try to set up vlc to stream mp4+aac over http instead of 
>>>rtsp? Wondering if this would work with the mobile...
>>>
>>>>At 13:21 08/12/2005 -0800, Torben Knerr wrote:
>>>>
>>>>>that sounds interesting... is it possible to stream mp4+aac over http 
>>>>>with vlc?  can you relay this stream via dss and access it through an sdp file?
>>>>>I would be very glad to hear if you succeed in this :)
>>>>>
>>>>>Otherwise my guess is trying to recompile vlc with amr-wb (a.k.a. 
>>>>>samr) enabled, but I'm not sure if vlc can stream it... Maybe this 
>>>>>would be the better solution because of the overhead of http.
>>>>>
>>>>>Plz keep us posted,
>>>>>Torben
>>>>>
>>>>>
>>>>>On 12/8/05, PERET Pierre-Hugues 
>>>>><<mailto:ph.peret at free.fr>ph.peret at free.fr> wrote:
>>>>>>Hello again,
>>>>>>I fall upon a description of the realplayer for mobile phones, and it 
>>>>>>seems that AAC audio cannot be streamed via rtsp with mpeg4 video. 
>>>>>>AAC audio can be streamed in http.
>>>>>>go here for more info 
>>>>>><https://symbian.helixcommunity.org/>https://symbian.helixcommunity.org/
>>>>>>
>>>>>>
>>>>>>At 08:51 08/12/2005 -0800, you wrote:
>>>>>>>Hi,
>>>>>>>
>>>>>>>I tried that about half a year ago with the same setup 
>>>>>>>(vlc+dss+sdp), and I was also facing the same problem with the sound.
>>>>>>>What device do you have? I have a Nokia 6630. The strange thing 
>>>>>>>about it was, that it played mp4/aac content locally without 
>>>>>>>problems -- but when I tried to stream the same mp4/aac content then 
>>>>>>>there was no sound. Maybe it is a problem with the device not 
>>>>>>>supporting aac streamed over rtsp..?
>>>>>>>Because that did not work, I tried to stream with amr/samr audio 
>>>>>>>instead of aac, but it failed because vlc does not officially 
>>>>>>>support amr. Well, you need to compile ffmpeg with amr enabled and 
>>>>>>>then recompile vlc with the amr-enabled ffmpeg. That allowed me to 
>>>>>>>play amr files locally with vlc, but streaming amr was not supported 
>>>>>>>at this time...
>>>>>>>
>>>>>>>If you get it work somehow, either with aac or amr/samr, please let 
>>>>>>>me know!
>>>>>>>@VLC team: is it by now possible to stream amr/samr with a 
>>>>>>>self-compiled ffmpeg lib? Did anyone succeed with that?
>>>>>>>
>>>>>>>Cheers,
>>>>>>>torben
>>>>>>>
>>>>>>>
>>>>>>>On 12/8/05, PERET Pierre-Hugues 
>>>>>>><<mailto:ph.peret at free.fr>ph.peret at free.fr> wrote:
>>>>>>>>Hello,
>>>>>>>>I'm trying to stream contents transcoding or not to mobile phones.
>>>>>>>>At the moment, i'm using VLC + DSS , but i cannot get the sound 
>>>>>>>>working on
>>>>>>>>my mobile phone.
>>>>>>>>The file plays fine when accessed directly through the url
>>>>>>>><http://??>rtsp://my.server.com:554/myfile.mp4 , but if i want to 
>>>>>>>>stream it with vlc +
>>>>>>>>DSS the mobile phone player (realplayer) doesn't load the sound. 
>>>>>>>>Accessing
>>>>>>>>the stream with QTplayer on my PC (windows) works fine.
>>>>>>>>Any idea about that ?
>>>>>>>>Someone got streaming for mobile phone (3GP) working ?
>>>>>>>>The goal would be to have vlc transcode a live stream and feed the DSS
>>>>>>>>server with a .sdp file.
>>>>>>>>
>>>>>>>>thanks
>>>>>>>>
>>>>>>>>--
>>>>>>>>This is the streaming mailing-list, see 
>>>>>>>><http://www.videolan.org/streaming/>http://www.videolan.org/streaming/
>>>>>>>>To unsubscribe, please read 
>>>>>>>><http://www.videolan.org/support/lists.html>http://www.videolan.org/support/lists.html
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