Bug#894191: ffmpeg: silence when copying AAC (LC) from MKV to AVI

[James Cowgill]

Hi,

On 28/03/18 05:42, Рома Тенцер wrote:
> Here's a part of it (all file is too big).
> 
> I find a warning in ffmpeg/ffprobe output:
> 
> "[aac @ 0x169bc80] This stream seems to incorrectly report its last
> channel as LFE[3], mapping to LFE[0]"
> 
> I can't reproduce this bug with other files, so i think it can be a
> problem.
> 
> And i was wrong, it's not a silence. It's a low volume level in avi.
> 
> I use this command:
> 
> "ffmpeg -i sample.mkv -c:v mpeg4 -q:v 1 -c:a copy sample.avi"

I can't seem to reproduce any audio issues with that command. After
running that, both sample.mkv and sample.avi play fine in ffplay and
mpv. I don't think there is any audio within the first 3 seconds of the
sample you gave me. I get the warning you mention, but the LFE channel
appears to be silent throughout the sample so I'm not sure if that is
the issue.

Thanks,
James

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