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

Your message dated Sun, 8 Aug 2021 23:03:06 +0200
with message-id <YRBGiiywl69HggLv@ramacher.at>
and subject line Re: Bug#894191: ffmpeg: silence when copying AAC (LC) from MKV to AVI
has caused the Debian Bug report #894191,
regarding ffmpeg: silence when copying AAC (LC) from MKV to AVI
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
894191: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=894191
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: ffmpeg
Version: 7:3.4.2-1
Severity: minor
I have a .mkv file with avc for video and aac (lc) for audio. When i copy audio stream to .avi (i recode avc to mpeg4, so i think it's a better container) in the result file audio get silent after a first one or two second. When i copy the audio to .mkv it works fine so i think it's a muxer problem. I don't really sure if avi supports aac, but if it isn't i think ffmpeg should warn user.
I use ffmpeg 3.4.2 that i build for stretch manually from buster source. Please test it in buster. 

-- System Information:
Debian Release: 9.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 4.9.0-6-686-pae (SMP w/1 CPU core)
Locale: LANG=ru_RU.utf8, LC_CTYPE=ru_RU.utf8 (charmap=UTF-8), LANGUAGE=ru_RU.utf8 (charmap=UTF-8) 
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages ffmpeg depends on:
ii  libavcodec57    7:3.4.2-1
ii  libavdevice57   7:3.4.2-1
ii  libavfilter6    7:3.4.2-1
ii  libavformat57   7:3.4.2-1
ii  libavresample3  7:3.4.2-1
ii  libavutil55     7:3.4.2-1
ii  libc6           2.24-11+deb9u3
ii  libpostproc54   7:3.4.2-1
ii  libsdl2-2.0-0   2.0.5+dfsg1-2
ii  libswresample2  7:3.4.2-1
ii  libswscale4     7:3.4.2-1

ffmpeg recommends no packages.

Versions of packages ffmpeg suggests:
ii  ffmpeg-doc  7:3.4.2-1

-- no debconf information

--- End Message ---
--- Begin Message --- 
On 2018-03-28 13:16:35 +0100, James Cowgill wrote:
> 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.

This message never got a reply, so let's close the bug.

Cheers
-- 
Sebastian Ramacher

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