[FFmpeg-trac] #3019(avfilter:new): fieldmatch + decimate causes out-of-sync audio

[FFmpeg]

#3019: fieldmatch + decimate causes out-of-sync audio
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  spookybathtub                      |                   Status:  new
                 Type:  defect       |                Component:  avfilter
             Priority:  normal       |               Resolution:
              Version:  2.0.1        |               Blocked By:
             Keywords:  pullup       |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by spookybathtub):

 Same thing happens with latest git version.
 {{{
 ffmpeg -i NCIS.ts -ss 00:02:00 -t 30 -vf "fieldmatch,
 yadif=deint=interlaced, decimate" -acodec copy -vcodec mpeg4 test.mkv
 ffmpeg version N-56820-g5e253fd Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Oct  2 2013 09:37:06 with llvm-gcc 4.2.1 (LLVM build
 2336.11.00)
   configuration: --enable-gpl --enable-version3 --enable-postproc
 --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-
 libass --enable-libopenjpeg --enable-openssl --enable-libopus --enable-
 libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-libx264 --enable-yasm --enable-swscale --enable-
 avfilter --enable-libmodplug --enable-libbluray --enable-gnutls --enable-
 shared --enable-pthreads --arch=x86_64 --enable-nonfree --enable-opencl
 --enable-avresample
   libavutil      52. 46.100 / 52. 46.100
   libavcodec     55. 33.101 / 55. 33.101
   libavformat    55. 18.104 / 55. 18.104
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 88.100 /  3. 88.100
   libavresample   1.  1.  0 /  1.  1.  0
   libswscale      2.  5.100 /  2.  5.100
   libswresample   0. 17.103 /  0. 17.103
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mpegts, from 'NCIS.ts':
   Duration: 00:58:56.86, start: 10892.598633, bitrate: 11280 kb/s
   Program 258
     Stream #0:0[0xe0]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
 yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], max. 79975 kb/s, 29.97
 fps, 29.97 tbr, 90k tbn, 59.94 tbc
     Stream #0:1[0x80](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
 5.1(side), fltp, 384 kb/s
     Stream #0:2[0x81](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
 mono, fltp, 96 kb/s (visual impaired)
 Output #0, matroska, to 'test.mkv':
   Metadata:
     encoder         : Lavf55.18.104
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR
 1:1 DAR 16:9], q=2-31, 200 kb/s, 1k tbn, 23.98 tbc
     Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz,
 5.1(side), 384 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 frame=    0 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A
 video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 1353.191489%
 Received signal 2: terminating.
 macpro:NCIS.eyetv elliott$ ffmpeg -ss 00:02:00 -i NCIS.ts -t 30 -vf
 "fieldmatch, yadif=deint=interlaced, decimate" -acodec copy -vcodec mpeg4
 test.mkv
 ffmpeg version N-56820-g5e253fd Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Oct  2 2013 09:37:06 with llvm-gcc 4.2.1 (LLVM build
 2336.11.00)
   configuration: --enable-gpl --enable-version3 --enable-postproc
 --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-
 libass --enable-libopenjpeg --enable-openssl --enable-libopus --enable-
 libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-libx264 --enable-yasm --enable-swscale --enable-
 avfilter --enable-libmodplug --enable-libbluray --enable-gnutls --enable-
 shared --enable-pthreads --arch=x86_64 --enable-nonfree --enable-opencl
 --enable-avresample
   libavutil      52. 46.100 / 52. 46.100
   libavcodec     55. 33.101 / 55. 33.101
   libavformat    55. 18.104 / 55. 18.104
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 88.100 /  3. 88.100
   libavresample   1.  1.  0 /  1.  1.  0
   libswscale      2.  5.100 /  2.  5.100
   libswresample   0. 17.103 /  0. 17.103
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mpegts, from 'NCIS.ts':
   Duration: 00:58:56.86, start: 10892.598633, bitrate: 11280 kb/s
   Program 258
     Stream #0:0[0xe0]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
 yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], max. 79975 kb/s, 29.97
 fps, 29.97 tbr, 90k tbn, 59.94 tbc
     Stream #0:1[0x80](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
 5.1(side), fltp, 384 kb/s
     Stream #0:2[0x81](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
 mono, fltp, 96 kb/s (visual impaired)
 File 'test.mkv' already exists. Overwrite ? [y/N] y
 Output #0, matroska, to 'test.mkv':
   Metadata:
     encoder         : Lavf55.18.104
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR
 1:1 DAR 16:9], q=2-31, 200 kb/s, 1k tbn, 23.98 tbc
     Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz,
 5.1(side), 384 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 [Parsed_fieldmatch_0 @ 0x7fc4fa800000] Frame #138 at 5.39704 is still
 interlaceds
 frame=  720 fps= 20 q=31.0 Lsize=    6856kB time=00:00:30.03
 bitrate=1870.2kbits/s
 video:5440kB audio:1401kB subtitle:0 global headers:0kB muxing overhead
 0.212005%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3019#comment:4>
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