Support for Opus in MP4 support

Opus is already supported in the .caf container format, however, it is not supported in .mp4.

Opus is used heavily across the board so I often come across mp4s that don’t have audio on iOS and Safari.

Implementation document: https://opus-codec.org/docs/opus_in_isobmff.html

Support for Opus in MP4 support
 
 
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