Plex can detect external subtitle files and allow using them during playback
Similar abilities for external audio tracks would be highly appreciated
Possible use cases might be -
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A certain video title has an improved audio source in a different file, may a be a different surround sound mix or a remastered audio track. The feature allow their integration easily
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The video has a new language track or commentary track, previously not available
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The system is incapable of correctly decoding existing track, so a custom transcoded or downmixed track can solve many quality issue
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Doing a downmixing or transcoding of existing multichannel audio, then applying some effects for dialogue clarity or volume normalization is quite common for a little advanced user like me. So, being able to use these modified tracks as external audio files can actually quite handy
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Finally offloading transcoding job and saving files permanently will reduce redundant server processing load
I hope people still won’t consider it a too advanced feature!