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    Jellyfin Forum Support Troubleshooting SOLVED: AC3 Mono won't play or transcode unless app is set to downmix to stereo

     
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    SOLVED: AC3 Mono won't play or transcode unless app is set to downmix to stereo

    coffeetablecandle
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    #9
    2025-06-02, 08:20 PM
    (2025-06-02, 12:34 AM)theguymadmax Wrote: You can use mkvalidator to check the mkv containers. I'm sure it'll come back with errors vs the remuxed version. Besides checking manually, I know of no other way to determine this, other than noticing the video has errors when played.

    Interesting results, neither are valid. The remux that works has way more errors than the original, but different errors all related to the subtitles.

    Original.mkv that does not work has ERR200: "Missing element 'SimpleTag' in Tag at 745 and 769" and Warning WRN0E7: "DisplayUnit seems to be pixels not aspect-ratio for Video track 1 1480px width from 1480, 1080px height from 1080". Created with Lavf57.7.2 / Handbrake

    Remux.mkv that does work has a huge amount of ERR0B1: "Block at insertlongnumber track 3 is not a keyframe". Created with Lavf58.45.100

    Subtitles work no problem though.

    Curious that the issue with the original resolves by downmixing to stereo, but I can't seem to find any info on what those particular errors mean.
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    Messages In This Thread
    AC3 Mono won't play or transcode unless app is set to downmix to stereo - by coffeetablecandle - 2025-05-25, 10:33 PM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by coffeetablecandle - 2025-05-30, 04:16 AM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by gnattu - 2025-05-30, 04:33 AM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by coffeetablecandle - 2025-05-30, 05:42 AM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by gnattu - 2025-05-30, 07:32 AM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by theguymadmax - 2025-05-30, 03:51 PM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by coffeetablecandle - 2025-06-01, 11:01 PM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by theguymadmax - 2025-06-02, 12:34 AM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by coffeetablecandle - 2025-06-02, 08:20 PM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by theguymadmax - 2025-06-02, 09:36 PM
    RE: AC3 Mono won't play or transcode unless app is set to downmix to stereo - by coffeetablecandle - 2025-06-02, 10:38 PM

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