[FFmpeg-trac] #1868(undetermined:new): qdm2: 8bps mode decodes with audiable distortions

[FFmpeg]

#1868: qdm2: 8bps mode decodes with audiable distortions
-------------------------------------+-------------------------------------
               Reporter:  ami_stuff  |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:             |  undetermined
  unspecified                        |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 similar problem can be reproduced with file from ticket #742

 {{{
 C:\>ffmpeg -i 44kHz_8kbps.aif out.wav
 ffmpeg version N-45867-g3318d6b Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Oct 23 2012 02:39:33 with gcc 4.5.0 (GCC) 20100414 (Fedora
 MinGW 4.5.
 0-1.fc14)
   configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build
 --arch=
 x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686
 -pc-min
 gw32-gcc' --enable-w32threads --enable-memalign-hack --enable-runtime-
 cpudetect
 --enable-cross-compile --enable-static --disable-shared --extra-
 libs='-lws2_32 -
 lwinmm -lpthread' --extra-cflags='--static
 -I/var/www/users/research/ffmpeg/snap
 shots/build/include' --extra-ldflags='-static
 -L/var/www/users/research/ffmpeg/s
 napshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-
 version3
 --enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora
 --enable-
 libvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb
 --enable-
 libopencore-amrwb --enable-libmp3lame --enable-libvpx --disable-
 decoder=libvpx
   libavutil      51. 77.100 / 51. 77.100
   libavcodec     54. 68.100 / 54. 68.100
   libavformat    54. 33.100 / 54. 33.100
   libavdevice    54.  3.100 / 54.  3.100
   libavfilter     3. 20.104 /  3. 20.104
   libswscale      2.  1.101 /  2.  1.101
   libswresample   0. 16.100 /  0. 16.100
   libpostproc    52.  1.100 / 52.  1.100
 Guessed Channel Layout for  Input Stream #0.0 : mono
 Input #0, aiff, from '44kHz_8kbps.aif':
   Duration: 00:00:00.00, start: 0.000000, bitrate: 33509 kb/s
     Stream #0:0: Audio: qdm2 (QDM2 / 0x324D4451), 44100 Hz, mono, s16, 8
 kb/s
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf54.33.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono,
 s16,
 705 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (qdm2 -> pcm_s16le)
 Press [q] to stop, [?] for help
 size=     400kB time=00:00:00.09 bitrate=34869.7kbits/s
 video:0kB audio:400kB subtitle:0 global headers:0kB muxing overhead
 0.019531%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1868>
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