[FFmpeg-user] Audio not playing in Quicktime Player

[Erik Dobberkau]

>
> But as said, I am not convinced that QT is the ideal playback software
> for mp4.
>

Regardless whether it is or not, there is some spec in QuickTime Player
which requires .mp4 containers to have h.264 (and obviously now also h.265)
video, and aac audio. OTOH I can't remember where I got this from, it's
quite some years back...