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+--- Thread: SOLVED: AC3 Mono won't play or transcode unless app is set to downmix to stereo (/t-solved-ac3-mono-won-t-play-or-transcode-unless-app-is-set-to-downmix-to-stereo)
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RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - coffeetablecandle - 2025-06-02
(2025-06-02, 09:36 PM)theguymadmax Wrote: On the AndroidTV client downmix to stereo only supports a few codecs:
Codec.Audio.AAC
Codec.Audio.MP2
Codec.Audio.MP3
Anything besides these audio codecs with more than 2 channels will trigger the audio stream to transcode. Since the video stream is compatible, you'll trigger a Direct Stream (Video copy with the audio transcoded to mono AAC). Which is why it works when downmixing vs Direct Play. Subtitles have nothing to do with your situation. It's a container issue.
It's all too complex for me maybe haha.
I guess what I meant was that I don't understand why downmixing to stereo (and therefore transcoding) seems to fix (or bypass) the container issue that prevents Jellyfin from playing the video directly.
In the end it doesn't matter I guess, I'll just have to be content with needing to downmix to stereo, or remux all the affected files, though I should first figure out how to avoid ERR0B1.