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

[Рома Тенцер]

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