[FFmpeg-devel] Stream pass throught "buffer underflow"

[Pablo Yaggi]

Hi,
????????I have an mpeg encapsulated file with one mp4 video stream and one mp3 
audio 
stream.
????????I open the file and create an ouputContext with the same format as the
input file, i also add to that context one mp4 video stream and one mp3 audio 
stream with the same codecs id's and stream's ids as the input file.
????????I open an output url for the context and did this:

????????????????av_write_header(outputContext);
????????????????while(av_read_frame(inputContext, &packet)>=0) 
????????????????{
????????????????????????????????av_write_frame(outputContext,&packet);
????????????????}
????????????????av_write_trailer(outputContext);????????

????????while the frames were being writen a "buffer underflow" error kept 
showing 
up.
????????when i try to play the resulting file only audio is available and 
mplayer 
warning this :
MPEG-PS file format detected.
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
missing marker bit!
MPEG: bad sequence header
MPEG: FATAL: EOF while searching for sequence header.
Video: Cannot read properties.

????????If it is necesary i could post the full code. I also noticed that with 
mpeg 2 
video streams the buffer underflow error keeps showing but the resulting file 
has playable audio and video.

????????Any ideas how to fix this ?

Best regards
Pablo Yaggi
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Subject: Stream pass throught "buffer underflow"
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