[FFmpeg-trac] #2539(undetermined:new): indeo 4 artefacts with low quality (keyframes)

FFmpeg trac at avcodec.org
Mon May 6 14:15:29 CEST 2013


#2539: indeo 4 artefacts with low quality (keyframes)
-------------------------------------+-------------------------------------
               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
-------------------------------------+-------------------------------------
 ffmpeg's indeo4 decoder decodes with artefacts files encoded in low
 quality when keyframes are repeated every 2 frames or more (bigger value -
 more visible artefacts

 {{{
 C:\>ffmpeg -i 5p_every_20.avi -vcodec msmpeg4v2 out.avi
 ffmpeg version N-52725-ge756635 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on May  4 2013 02:45:38 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      52. 28.100 / 52. 28.100
   libavcodec     55.  7.100 / 55.  7.100
   libavformat    55.  4.101 / 55.  4.101
   libavdevice    55.  0.100 / 55.  0.100
   libavfilter     3. 63.101 /  3. 63.101
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, avi, from '5p_every_20.avi':
   Duration: 00:00:04.67, start: 0.000000, bitrate: 177 kb/s
     Stream #0:0: Video: indeo4 (IV41 / 0x31345649), yuv410p, 240x180, 15
 tbr, 15
  tbn, 15 tbc
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.4.101
     Stream #0:0: Video: msmpeg4v2 (MP42 / 0x3234504D), yuv420p, 240x180,
 q=2-31,
  200 kb/s, 15 tbn, 15 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (indeo4 -> msmpeg4v2)
 Press [q] to stop, [?] for help
 frame=   49 fps=0.0 q=3.7 size=     121kB time=00:00:03.26 bitrate=
 303.0kbits/s
 frame=   70 fps=0.0 q=4.0 Lsize=     166kB time=00:00:04.66 bitrate=
 290.9kbits/
 s
 video:158kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 4.553662%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2539>
FFmpeg <http://ffmpeg.org>
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