[streaming] Re: Spam: streaming to a nokia phone

[Torben Knerr]

Cavalera Claudio wrote:

>>-----Original Message-----
>>From: streaming-bounce at videolan.org 
>>[mailto:streaming-bounce at videolan.org] On Behalf Of Torben Knerr
>>Sent: Thursday, April 28, 2005 9:17 AM
>>To: streaming at videolan.org
>>Subject: Spam: [streaming] streaming to a nokia phone
>>
>>
>>hi,
>>
>>has anyone managed to stream from vlc to a nokia phone?
>>    
>>
> 
>  
>
>>i have a nokia 6630 umts phone with builtin realplayer, which 
>>should be 
>>capable
>>of (3gp compliant) mp4 content.
>>on the serverside i have darwin streaming server, which 
>>handles the rtsp 
>>setup,
>>and vlc to encode video to mp4. vlc sends the encoded video 
>>over rtp to darwin, which "reflects" or "forwards" the rtp 
>>stream to the client once the rtsp session has been set up.
>>
>>i've tried it with a very low videobitrate (24kBit/s, i.e. 
>>--sout-transcode-vb=3) and no audio,
>>since i'm not in an umts area at the moment (gprs only).
>>other encoding options were:
>>--sout-transcode-width=176 --sout-transcode-height=144 
>>--sout-transcode-vcodec="mp4v"
>>--sout-transcode-vb="3" --sout-transcode-fps="15"
>>
>>first problem, realplayer said there would not be enough bandwidth. i 
>>solved it by manually
>>editing the vlc generated sdp file and added "b=AS:24" to 
>>indicate the 
>>bandwith.
>>after that the realplayer began to do download, but never 
>>started playing...
>>    
>>
> 
>Hello Torben,
>  
>
Dear Claudio,

>I think in advanced network settings of realplayer on Nokia 6630 you can
>adjust bandwidths for GPRS/EGPRS/UMTS, therefore changing the SDP should
>be unnecessary.
>  
>
thanks for pointing me to those settings, they are pretty hidden in the 
menu.

>I would try with less fps, around 7 or so.
>Are you able to play that stream with realone player or VLC on a PC?
>  
>
on PC it plays like a charm with almost all players capable of 
mp4-rtsp-streaming (e.g. real, quicktime,
windows media player (with MPEG4 DS Filters), Mpegable MP4 Player, IBM's 
MP4 Toolkit player,
VLC, and so on...)

>Also ethereal could help debug the rtp stream.
>  
>
I already did, and I believe a major problem is the lack of RTCP support 
of vlc (when acting as a server).
I know of other 3gp players, such as Philips Platform4 Player for 
PocketPC, who start playing only after
having received a RTCP Sender Report from the server.
With the Nokia's Realplayer, it doesn't begin to play the stream also, 
and continuosly sends UDP packets
to the server (which I believe are RTCP Receiver Reports) who in turn 
does not _not_ respond with a Sender Report.

Another big problem is that i'm not able to encode a mp4 file with vlc 
which will play on Nokias realplayer.
They (Nokia) state that they support only 3gp compliant mp4 files, so I 
think vlc is not really 3gp compliant,
which makes me doubt even more that the streaming thing is possible..

>Which is your source?
>  
>
Source should not be the problem, since i'm doing live transcoding.

>Please let me know if you succeed! :-)
>  
>
If this will ever happen I will :)

>Best Regards,
>Claudio
>
>  
>
Torben

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