[XviD-devel] Re: Aspect Ratio

Milan Cutka xvid-devel@xvid.org
Thu, 24 Oct 2002 10:28:39 +0200


C> If its easy to do and both dshow filters for XviD, means ffdshow
C> and xvid filter, support it, there are no incompatibilities either,
C> maybe only with elder playback filters.

I'm not sure if this will be so easy to support, because ffdshow (and
XviD DirectShow filter propably too) needs to know aspect ratio before
decoding first frame. MPEG2 demuxers provide this information in
VIDEOINFOHEADER2 structure, but I don't know where this information
would be stored in AVI - maybe appended to VIDEOINFOHEADER (if that's
possible).

   Milan