TL;DR: Use ffmpeg Man, if these reads like ad hominem, I wish you could read the whole story. The linked comment is admirably restrained to the point it prefer

TL;DR: Use ffmpeg Man, if these reads like ad hominem, I wish you could read the whole story. The linked comment is admirably restrained to the point it prefers being confusing over explaining what happened (fwiw I have no dog in the fight, was privy to the goings-on because my project depended on ffmpeg)