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.
- Derek
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