Bug#833722: ffmpeg: can hear music but no sound/dialogs from movie

Andreas Cadhalpun andreas.cadhalpun at googlemail.com
Thu Oct 13 21:44:00 UTC 2016

Control: tags -1 unreproducible

Hi shirish,

On 08.08.2016 11:39, shirish शिरीष wrote:
> Last few days, I have been able to hear the audio/songs/singing
> background but no dialogs.
> I see the following on the CLI -

Next time please also copy the command line, or at least mention the
program producing the output. I guess the below comes from mpv.

> [ffmpeg/audio] ac3: Channel layout '5.1(side)' with 6 channels does
> not match specified number of channels 2: ignoring specified channel
> layout
> AO: [pulse] 48000Hz stereo 2ch float
> VO: [opengl] 720x304 yuv420p
> AV: 00:00:00 / 01:30:22 (0%) A-V:  0.000
> [ffmpeg/audio] ac3: exponent 26 is out-of-range
> [ffmpeg/audio] ac3: error decoding the audio block

This looks like the sample is broken/corrupted.

> AV: 00:01:48 / 01:30:22 (1%) A-V:  0.000
> Does this mean the only fix for such movies is a 5.1 output or there
> could be some other fix ?

No. Both ffplay and mpv usually just downmix the audio automatically.
This works fine here without any warnings.

Can you share a sample reproducing the problem?

Otherwise I'm afraid I won't be able to help you.

Best regards,

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