[vlc] VLC 0.8.6 cannot display first seconds of a H264 encoded clip streamed from Darwin

suzie241 at tampabay.rr.com suzie241 at tampabay.rr.com
Wed Nov 14 20:03:10 CET 2007


Can anyone tell me how to remove my name from this mailing list? My question was answered, but I'm getting dozens of emails everyday about VLC stuff. Thanks. Suzanne
---- Gun Akkor <gakkor at patton.com> wrote: 
> Hello David, and All;
> 
> I have been experiencing the same problem on a x86PC based Linux
> platform running VLC version 0.8.6c while streaming UDP unicast or
> multicast.
> 
> My clips were encoded using x264 library -- i can provide the command
> line as well, if needed --
> 
> The debug output on the receiving VLC shows a series of the following
> messages before the decoder can sync up to show the video:
> 
> > [00000392] packetizer_h264 packetizer warning: waiting for SPS
> > [00000392] packetizer_h264 packetizer warning: waiting for SPS
> > [00000392] packetizer_h264 packetizer warning: waiting for SPS
> > [00000392] packetizer_h264 packetizer warning: waiting for SPS
> 
> I thought this may at least eliminate ffmpeg/x264, Windows XP/Linux,
> Darwin and the hardware as the possible culprits. I have to agree with
> David that this has to be related to the modifications to SPS/PPS support.
> 
> Regards,
> Gun Akkor
> 
> David Betrand wrote:
> > Hello all,
> > I use VLC to play a rtsp url pointing to a H264/AAC encoded file. The 
> > streaming server is Darwin. The stream was perfectly OK with VLC 
> > version 0.8.5, but with all versions starting from 0.8.6 (including 
> > 0.8.6c and trunk) show the same problem : the first seconds of the 
> > clip are not displayed (only audio) and then (after a few secs) the 
> > player is able to play the clip until the end. I suspect the player 
> > to be forced to wait until the second I frame to be able to decode it 
> > correctly.
> > The clips are encoded with ffmpeg (i can provide the command line if 
> > necessary) and hinted with MP4box. The problem is of course 
> > reproducible as it occurs systematically.
> > Note that when played locally, everything is fine. The problem is 
> > only when the file is streamed. I also replaced Darwin with VLM and 
> > the same problem occurs.
> > I uploaded a sample file (h264_first_seconds_lost.3gp) on the 
> > videolan ftp server under the h264_first_seconds_lost directory.
> > 
> > here are the details of my test environment :
> > - VLC 0.8.6c
> > - Windows XP SP 2
> > - Darwin Streaming Server 5.5.4
> > - Intel Pentium M 1.5 GHz, 512MB with ATI Mobility Radeon 9600 graphical card
> > 
> > As this problem seems to appear with version 0.8.6, i guess it is a 
> > regression introduced with this version (I saw that h264.c was a lot 
> > modified for SPS/PPS support). Any help will be appreciated.
> > Thanks David
> > 




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