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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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2
app/src/main/res/values/strings.xml
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@ -551,6 +551,8 @@
<string name="display_presets">Display presets</string>
<string name="display_presets_description">Built-in presets to quickly style all rows</string>
<string name="customize_home_summary">Choose rows and images on the home page</string>
<string name="prefer_ac3_for_surround_summary"><![CDATA[Transcode non-stereo audio to AC3/Dolby Digital]]></string>
<string name="prefer_ac3_for_surround">Use AC3 for surround sound audio</string>
<string name="start_after">Start after</string>
<string name="animate">Animate</string>
<string name="max_age_rating">Max age rating</string>