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VLC can't open mp4 file with OPUS/CBR. The error is following:
[00007f8cb0c04c60] opus decoder error: Error: corrupted stream?
[00007f8cb0c04c60] main decoder error: buffer deadlock prevented

The same file can be played with Chrome, Firefox and ffplay.

This file was created with following command:
ffmpeg -ss 00:00:00 -i ff-16b-2c-44100hz.opus.ogx -t 00:00:10 -codec libopus -vbr off -frame_duration 10 -strict -2 opus_cbr_10.mp4

Link to source file (but any other audio can be used for that):
https://dl.espressif.com/dl/audio/ff-16b-2c-44100hz.opus

Link to result file:
http://redbaron.atwebpages.com/media/opus_cbr_10.mp4

When mp4 file is created with vbr, then there is no such issue and VLC plays it well.

If VLC is rebuilt with following patch, then VLC plays opus_cbr_10.mp4 well. So, is it a bug in VLC or it is, indeed, corrupted stream?

Link to result file:
http://redbaron.atwebpages.com/media/opus_cbr_10.mp4

This file is not valid, it's 10 seconds long while the source file is 3 minutes and 7 seconds long.

This file is not valid, it's 10 seconds long while the source file is 3 minutes and 7 seconds long.

It was deliberately cut with ffmpeg options -ss 00:00:00 and -t 00:00:10 just to make the result file shorter.
If you omit these options, then the result file will be 3:07. I can provide it, if it matters. But the problem is, that the duration is not relevant to the issue, VLC stil will not be able to open it.

If VLC is rebuilt with following patch, then VLC plays opus_cbr_10.mp4 well.

Code: Select all

--- modules/demux/mp4/mp4.c 2019-12-12 12:58:53.775303509 +0300 +++ modules/demux/mp4/mp4_new.c 2019-12-12 12:59:04.292969877 +0300 @@ -3743,6 +3743,7 @@ case VLC_CODEC_DTS: case VLC_CODEC_MP4A: case VLC_CODEC_A52: + case VLC_CODEC_OPUS: i_max_v0_samples = 1; break; /* fixme, reverse using a list of uncompressed codecs */

So, is it a bug in VLC or it is, indeed, corrupted stream?

Sounds like it needs that fix, but it only depends on muxer as we already have opus in mp4 working :/

Sounds like it needs that fix, but it only depends on muxer as we already have opus in mp4 working :/

So, if it needs that fix, will it be fixed? The suggested patch is very simple though there may be a better solution.

I also noticed this issue by Android and Linux versions. Android is up to date so it seems this is not fixed.