[XviD-devel] [BUG] BFrame encoder doesn't force intra for 1st frame

[Michael Militzer]

Hi,

> > I get those results when using either divx5 bvop compatibility or plain
> > "xvid style". I'm glad that someone finally confirmed that problem.
> > For me, the xvid decoder crashes on bframes (even if I #define
> > #BFRAME_DEC), either the VFW in vdub and the DShow in WMP.
> > Interesting is that gruel could see that the files produced in windows
> > encoder are wrong (shows the same there), but if encoding in linux
> > everything is fine.
>
> strange. Especially because for me here the encoded files seem not broken,
> DivX5 and ffdshow can play them from the very beginning. So I'd rather
> suppose that something in the decoder part isn't perfect - but we'll
see...

I just commited a fix for the windows b-frame problems, at least for me
everything works fine now.
As supposed the unprocessed but queued frames caused the problem - I solved
this problem by writing N_VOPs to the bitstream while the queue is being
filled. Sure this is not the best solution because a delay is introduced
even if we'd use .MP4 file format, but as long as the API doesn't support
returning a status for every frame like processed/queued, there's nothing we
can do about it.

btw: before my changes there was a BitstreamPutBits(&bs, 0x7f, 8);
(encoder.c, l. 826) while the queue was being filled. I have to admit that I
don't really understand what this should do. Could the original author
(pete?) explain it to me, please?


Michael