[FFmpeg-devel] [PATCH] mov: Prioritize aspect ratio values found in pasp atom

[Vittorio Giovara]

On Wed, Apr 7, 2021 at 10:00 PM Derek Buitenhuis <derek.buitenhuis at gmail.com>
wrote:

> On 07/04/2021 19:56, Vittorio Giovara wrote:
> > My OS doesn't even let me install Quicktime 7, if anybody could chime in
> > and help solve this point it would be much appreciated.
> > Alternatively, I'd say we shouldn't cargo cult broken files generated by
> 11
> > year old software, but if people disagree we can leave things as they
> are.
>
> For MP4, at least, there is a definitive answer from ISO/IEC
>
>     The pixel aspect ratio and clean aperture of the video may be
> specified using the ‘pasp’ and ‘clap’
>     sample entry boxes, respectively. These are both optional; if present,
> they over-ride the declarations (if any) in
>     structures specific to the video codec, which structures should be
> examined if these boxes are absent. For
>     maximum compatibility, these boxes should follow, not precede, any
> boxes defined in or required by derived
>     specifications.
>

If no other comments/objections i'll fold this paragraph in the commit log
(thanks Derek) and push tomorrow.
-- 
Vittorio