Identified issues in existing AVIF files

Identified issues in existing AVIF files

Here are some issues that have been identified in existing AVIF files and how they may be fixed or avoided.

Incorrect profile brands

Missing ispe

ispe comes after transformational properties

Missing or incorrect pixi

Bad av1C

av1C contains optional config OBUs

Missing colr box

Missing NCLX colr box

Incorrect profile brands

Incorrect track handler type for auxiliary track

Incorrect value for track_in_movie flag

ccst not present for pict track

auxi not present for auxv track