[Ffmpeg-devel] PTS / DTS with XViD

Rich Felker dalias
Sat Jul 22 03:26:59 CEST 2006

On Fri, Jul 21, 2006 at 08:01:13PM +0300, Jani Boutellier wrote:
> As a concluding remark, I'll have to state that the problem was not at all 
> in the OGM format.
> After hours of trial and error I managed to get the XViD-encoded video into 
> a MPEG4 -container (.mp4). Surprisingly the the abovementioned problem with 
> OGM occurred also with mp4, so I figured that the true source of problems 
> was XViD.
> Soon I discovered that the video clips I had used, contained a so-called 
> "packed bitstream", which meant that the B-frames were crammed inside 
> P-frames. After I changed this in encoding settings and re-encoded the 
> video clips, the decoding worked well.

Did ffmpeg generate these bitstreams? I sure hope it's not calling
xvid with packed bitstream enabled...

> This means that although the OGM format was labeled as a "broken format" in 
> this thread, it probably would work well also with b-frames. However, I 
> didn't try that in practice anymore, since I'm happy with mp4 now :)

I imagine the timestamps would still be invalid but I'm not sure..


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