VLC does not play Multichannel OPUS Audio

[Felixkruemel]

So I've encoded an raw DTS 5.1 stream with ffmpeg to OPUS

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ffmpeg -i test.mkv -map 0:1 -acodec libopus -b:a 384k -mapping_family 255 testout.mkv

Now MPV will playback the Audio just fine, but VLC as of 3.0.12 won't. I'm on Windows 10 if that matters, although it should not.

It shows opus correctly in the Codec information:


And here's the ffprobe output:

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Stream #0:1(ger): Audio: opus, 48000 Hz, 5.1, fltp (default) Metadata: BPS-eng : 1509000 DURATION-eng : 00:45:05.120000000 NUMBER_OF_FRAMES-eng: 253605 NUMBER_OF_BYTES-eng: 510253260 _STATISTICS_WRITING_APP-eng: mkvmerge v52.0.0 ('Secret For The Mad') 64-bit _STATISTICS_WRITING_DATE_UTC-eng: 2021-01-27 16:32:48 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES ENCODER : Lavc58.119.100 libopus DURATION : 00:45:05.127000000

Is that an actual issue or am I too dumb to fix that


VLC Log says:

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opus error: Unsupported Channel Mapping

[Lotesdelere]

Please open Tools -> Messages (set Verbosity to 2) before you start the playback, and then paste the full resulting log here or on Pastebin.com or Justpaste.it if it's too long.

Also upload a short sample of your original problematic file to Zippyshare.com or to WeTransfer.com and then post the link to the file here.
https://www.zippyshare.com
https://wetransfer.com

If needed cut it with DGsplit and read here about how to do it:
https://forum.videolan.org/viewtopic.ph ... 35#p193335
100 MB max should be enough.

[ramonpc]

I had the same issue and solved by Avoiding the metadata network access:


Tools > Preferences(simple) > Uncheck: Allow metadata network access

or:

Tools > Preferences(advanced) > (Show Settings) All > PlayList > Uncheck: Allow metadata network access


I hope this helps.
Best regards.
RamonPC

[boeroboy]

I can confirm this too. Normal libopus works fine but the bug occurs when specifying ffmpeg arg "-ac 6" for 5.1 streams, etc. Media plays fine in other media players. Initially I figured this was a PipeWire issue but it seems to fail in both PipeWire and PulseAudio when the streams are not reading as just "Channels: Stereo" VLC falls on its face where other players work fine. There is a constant flow of corrupted stream errors in stderr as the media plays. In this case, "Channels: 3F2R/LFE"

[00007f91d8c1a780] opus decoder error: Error: corrupted stream?

Will investigate further because honestly VLC is still the best player for me and the other players have other codec issues. The metadata access workaround did not help me.

[Lotesdelere]

I can't reproduce the issue with the OPUS files I have.
Please post a message log and a sample file as requested in my previous post.

[boeroboy]

I can't reproduce the issue with the OPUS files I have.
Please post a message log and a sample file as requested in my previous post.

Right, try this one but I will remove it as soon as you've got a copy.
https://drive.google.com/file/d/1Xl6Xhp ... share_link

This on Fedora 37 using standard rpmfusion packaging:

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> vlc shares.av1.mp4 VLC media player 3.0.18 Vetinari (revision ) [000055672400b520] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. Warning: fallback to QtQuick software backend. [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? [00007fbf58c16490] opus decoder error: Error: corrupted stream? etc thousands of times repeated etc etc

Mediainfo:

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> mediainfo shares.av1.mp4 General Complete name : shares.av1.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/av01/iso2/mp41) File size : 204 KiB Duration : 9 s 93 ms Overall bit rate mode : Variable Overall bit rate : 184 kb/s Writing application : Lavf59.27.100 Video ID : 1 Format : AV1 Format/Info : AOMedia Video 1 Format profile : Main@L2.1 Codec ID : av01 Duration : 9 s 93 ms Bit rate : 149 kb/s Width : 512 pixels Height : 384 pixels Display aspect ratio : 4:3 Frame rate mode : Constant Frame rate : 23.976 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.032 Stream size : 166 KiB (81%) Color range : Limited Codec configuration box : av1C Audio ID : 2 Format : Opus Codec ID : Opus Duration : 9 s 0 ms Source duration : 9 s 6 ms Source_Duration_LastFrame : -14 ms Bit rate mode : Variable Bit rate : 28.9 kb/s Maximum bit rate : 48.0 kb/s Sampling rate : 48.0 kHz Compression mode : Lossy Stream size : 31.8 KiB (16%) Source stream size : 31.9 KiB (16%) Default : Yes Alternate group : 1

Sometimes media causes this over and over instead:

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[00007fc714c047b0] opus decoder error: cannot read Opus header [00007fc714c047b0] opus decoder error: initial Opus header is corrupted

[boeroboy]

Related: https://code.videolan.org/videolan/vlc/-/issues/27808

It looks like this fix was merged 2 weeks ago. Now just need to figure how to successfully build from source or wait for packaging to catch up.

[Lotesdelere]

You could try a nightly build:
https://nightlies.videolan.org