[FEAT]: convert surround to AC3

[piter-pit]

Description

I was struggling for a while with 5.1 sound since some movies, despite in 5.1 are played in stereo no matter what passthrough option I select (even force passthrough). I discovered Vimu player that has options to convert from surround (multi choice selectable like: DTS/TrueHD and AAC) and convert to AC3 or eAC3 what allowed to play in 5.1 configuration. Unfortunately Vimu has some other flaws so I still prefer Nova

Additional information

For reference, in jellyfish it was similar issue jellyfin/jellyfin-androidtv#2602
The conclusion was similar to transcode AAC to AC3. Most likely android in messing up with multichannel AAC since I don't understand why despite force passthrough it is playing stereo when only 5.1 track is available, shouldn't be just silence?

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