[FFmpeg-trac] #4042(undetermined:new): ffmpeg is not able to convert mp2 audio

[FFmpeg]

#4042: ffmpeg is not able to convert mp2 audio
--------------------------------+----------------------------------------
             Reporter:  f_rush  |                    Owner:
                 Type:  defect  |                   Status:  new
             Priority:  normal  |                Component:  undetermined
              Version:  2.4.2   |               Resolution:
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
--------------------------------+----------------------------------------

Comment (by f_rush):

 here is mencoder options:
 {{{ mencoder tv:// -tv
 driver=v4l2:device=/dev/video1:alsa:adevice=hw.1:forceaudio:volume=80 -ovc
 copy -oac lavc -lavcopts vcodec=libvorbis -vf harddup -o video2.mpg }}}
 here is convert attempt:
 {{{
 ffmpeg version 2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
   built on Oct  5 2014 09:31:05 with gcc 4.9.1 (Debian 4.9.1-16)
   configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector-
 strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro'
 --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl
 --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac
 --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm
 --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping
 --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger
 --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter
 --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb
 --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64
 -linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-
 gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus
 --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-
 mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi
 --enable-avresample --disable-htmlpages --disable-podpages --enable-
 libiec61883 --enable-libfdk-aac --enable-vaapi --enable-libx265 --enable-
 libdc1394 --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
   libavutil      54.  7.100 / 54.  7.100
   libavcodec     56.  1.100 / 56.  1.100
   libavformat    56.  4.101 / 56.  4.101
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  1.100 /  5.  1.100
   libavresample   2.  1.  0 /  2.  1.  0
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 [avi @ 0x1d2cfa0] non-interleaved AVI
 Input #0, avi, from 'abi.mpg':
   Metadata:
     encoder         : MEncoder SVN-r37289
   Duration: 01:32:15.60, start: 0.000000, bitrate: 123104 kb/s
     Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480,
 122872 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
     Stream #0:1: Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, s16p,
 224 kb/s
 Output #0, mp2, to 'abi.mp2':
   Metadata:
     encoder         : Lavf56.4.101
     Stream #0:0: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
     Metadata:
       encoder         : Lavc56.1.100 mp2
 Stream mapping:
   Stream #0:1 -> #0:0 (mp2 (native) -> mp2 (native))
 Press [q] to stop, [?] for help
 size=      37kB time=00:08:36.10 bitrate=   0.6kbits/s
 video:0kB audio:37kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.000000%
 Received signal 2: terminating.
 }}}
 confirm that result file is incorrect. here is information about output
 file (conversion process was manually stopped after several minutes,
 that's why it's much shorter and anyway it should not affect the process
 itself )

 {{{
 [mp3 @ 0x19f9b20] Estimating duration from bitrate, this may be inaccurate
 Input #0, mp3, from 'abi.mp2':
   Duration: 00:00:00.82, start: 0.000000, bitrate: 372 kb/s
     Stream #0:0: Audio: mp2, 48000 Hz, stereo, s16p, 372 kb/s
 At least one output file must be specified
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4042#comment:3>
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