[Live-devel] Sync problems streaming H.263+ and MPEG4

[Juan Jose Galvez]

Hi,

I'm trying to stream H.263+ and MPEG4 (with MP3) with the LIVE.COM 
libraries. I want to receive the streams with MPlayer but i'm having several 
A/V sync problems when viewing (video is ahead of audio).

Although VLC plays these streams correctly, I've been looking into the 
problem and right now I suspect it's not a problem of MPlayer. MPlayer 
reproduces correctly MPEG1/2 and MP3 sent with the streamer I'm programming. 
It also reproduces correctly H.263+ and MPEG4 with MP3 when sent with VLC 
(over MPEG TS/RTP).

I think the problem is I'm not calculating correctly the presentation stamps 
of each frame. I've implemented FramedSources to give discrete H.263 frames 
and MPEG4 frames to the respective sinks. I'm feeding the output of my MPEG4 
FramedSource to the MPEG4VideoStreamDiscreteFramer. If I feed it to the 
MPEG4VideoStreamFramer, this class seems to calculate correct values for the 
presentation stamps and I get good synk at the receiver, although this class 
doesn't parse very well the frames I'm giving it.

My way of calculating the presentation stamp for each frame (H.263+/MPEG4) 
is based solely on the fps of the video stream. That is, 
timeperframe=100000/fps. I based this on the code for the 
ElphelJPEGVideoSource although I suspect that with H.263+/MPEG4 this is not 
correct...
Could you please tell me if this might be the problem and how I can solve 
this (maybe there's already code for streaming these video formats).

Thanks for your help.

Juan Jose Gálvez.

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