[vlc-devel] Re: Problem playing some MPEG-4 audio RTSP/RTP streams

[Laurent Aimar]

On Mon, Feb 23, 2004, Ross Finlayson wrote:
> I have recently been experimenting with the RTSP/RTP support (using our 
> "LIVE.COM Streaming Media" libraries) that was recently added to 
> VLC.  Overall, I'm very pleased with VLC - I'm now promoting VLC as the 
> leading standards-based media player (having pretty much given up on 
> QuickTime Player, due to its generally poor performance and its increasing 
> list of unfixed bugs).
> 
> However, I did notice a problem playing some MPEG-4 audio 
> ("audio/MPEG4-GENERIC") streams (which QuickTime Player plays OK).  For 
> example:
> 	rtsp://mpeg4.sunsite.utk.edu/wuot.sdp
> 		This plays for only 4 seconds.
> 	rtsp://rocky.marlboro.edu:554/test1.sdp
> 		This doesn't play at all.
> However, the following stream plays OK:
> 	rtsp://inet.orban.com/test.sdp
 I have tested with rtsp://mpeg4.sunsite.utk.edu/wuot.sdp and it seems
that live.com return a weird value (or I misunterstood the meaning):

In the main loop function (Demux) I do (line 777):

            tk->readSource->getNextFrame( tk->buffer, 65536,
                                          StreamRead, tk,
                                          StreamClose, tk );

 where tk->buffer is my buffer, StreamRead and StreamClose are callbacks.
(tk->readSource is a FrameSource * from MediaSubsessionIterator->readSource)

with :
static void StreamRead( void *p_private, unsigned int i_size, struct timeval pts );

After a few seconds pts.tv_sec becomes (and stays) negative, and this break the PTS
computation and no audio samples are played.

....
pts.tv_sec=1077528378 pts.tv_usec=26051 
pts.tv_sec=1077528378 pts.tv_usec=26051 
pts.tv_sec=1077528378 pts.tv_usec=26051 
pts.tv_sec=1077528378 pts.tv_usec=26051 
pts.tv_sec=1077528378 pts.tv_usec=118930
pts.tv_sec=1077528378 pts.tv_usec=118930
pts.tv_sec=1077528378 pts.tv_usec=118930
pts.tv_sec=1077528378 pts.tv_usec=118930
pts.tv_sec=-530742096 pts.tv_usec=237329
pts.tv_sec=-530742096 pts.tv_usec=237329
pts.tv_sec=-530742096 pts.tv_usec=237329
pts.tv_sec=-530742096 pts.tv_usec=237329
pts.tv_sec=-530742096 pts.tv_usec=330208
pts.tv_sec=-530742096 pts.tv_usec=330208
.....

Any ideas ?

-- 
fenrir

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