[FFmpeg-devel] Brainfart cropping

Jason Garrett-Glaser darkshikari
Thu Sep 11 00:39:00 CEST 2008


On Wed, Sep 10, 2008 at 12:59 PM, Jason Garrett-Glaser
<darkshikari at gmail.com> wrote:
> On Wed, Sep 10, 2008 at 12:58 PM, Jason Garrett-Glaser
> <darkshikari at gmail.com> wrote:
>>> the crop values are AFAIK in chroma samples, so 8 should be correct for 4:2:0
>>> But it should be easy to check with the reference sw how much is cropped.
>
> Ah nevermind, you are right.  Which raises the question, of course,
> why are we getting this message all over the place from x264-encoded
> videos?

And it appears the mistake is actually in x264, and nobody ever
noticed because cropping is almost always handled on the container
level, despite the mistake being there since the original commit to
add support for non-mod16 in late 2005.

Dark Shikari




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