[FFmpeg-devel] 16:9 DV AVI not detected

Michael Niedermayer michaelni
Tue Jan 1 23:39:53 CET 2008

On Mon, Dec 31, 2007 at 12:57:41PM -0800, Roman Shaposhnik wrote:
> >>     The only possible workaround that I know of is to
> >> do what is done for AVI type 1 DV, but it'll be more
> >> trouble than it is worth. IMHO.
> >
> > if the dv decoder knows the aspect ratio,
>    It doesn't right now. That logic is in  the DV demuxer. btw, would
> you agree that things like SAR/DAR signaling are actually part
> of the container, not codec info?

some codecs store aspect ratio, some containers store aspect ratio
we currently have just AVCodecContext.sample_aspect_ratio, and both
demuxers and decoders use that ...
we could add AVStream.sample_aspect_ratio if having just one variable
turns out to be insufficient ...

for the specific case of DV, i think the aspect ratio is part of the
codec stream, but thats surely debatable as dv mixes codec and container

but maybe i missunderstood your question, due to having no russian stuff
here ;)


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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