[Ffmpeg-devel] PTS / DTS with XViD

Loren Merritt lorenm
Mon Jul 17 17:17:37 CEST 2006

On Mon, 17 Jul 2006, Jani Boutellier wrote:

> Hi,
> I'm using ffmpeg's libavformat to read a XViD stream that is wrapped in the 
> OGM container. It works fine as long as I do not use B-Frames in XVid.
> When I use B-frames, I assume that I should read the PTS / DTS -indexes from 
> the AVPacket structure to get the correct frame order for decoding, right?
> Well, PTS ans DTS both show just the ascending index numbers of the frames 
> read from the bitstream, giving no hint of the correct frame decoding order 
> -- and the video gets messed up.
> Is there another place where I should read the PTS and DTS from or what is 
> the correct procedure anyway?
> BTW: I do not use libavcodec to decompress XVid frames, I just want read the 
> frame bitstream from the OGM file with FFMPEG.

OGM doesn't know anything about B-frames (it has all the same limitations 
as AVI in that regard). And all containers I've ever heard of store frames 
in decoding order.

--Loren Merritt

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