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Experimental option to transcode surround sound audio to AC3 (#947)

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## Description
Adds an experimental setting to prefer transcoding audio with more than
2 channels to AC3. Stereo audio does not transcode.

This is basically a workaround for HDMI ARC (not eARC) or optical audio
devices because instead of 2 uncompressed PCM channels, 6 AC3 channels
(ie 5.1) is possible.

An downside of enabling this is that embedded subtitles be burned in
causing a video transcode as well.

### Related issues
Fixes #255
Incorporates some code from #1410

### Testing
Just on the emulator so far to observe if the settings trigger the
transcode or not

## Screenshots
N/A

## AI or LLM usage
None

---------

Co-authored-by: darkflame91 <darkflame91@gmail.com>
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Damontecres 2026-07-09 13:15:42 -04:00 • committed by GitHub
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app/src/main/proto/WholphinDataStore.proto
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@ -215,6 +215,7 @@ message MusicPreferences {
message ExperimentalPreferences {
bool enabled = 1;
bool video_tunneling_enabled = 2;
bool prefer_ac3_surround = 3;
}
message AppPreferences {