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

[FFmpeg]

#3019: fieldmatch + decimate causes out-of-sync audio
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  spookybathtub                      |                   Status:  open
                 Type:  defect       |                Component:  avfilter
             Priority:  normal       |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:  pullup       |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 The original desync problem is also reproducible with the following
 command line:
 {{{
 $ ffmpeg -i NCIS-trim.ts -vf pullup,decimate -qscale 2 out.avi
 ffmpeg version N-56994-g19fda0a Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Oct  9 2013 15:38:08 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 46.101 / 52. 46.101
   libavcodec     55. 35.100 / 55. 35.100
   libavformat    55. 19.100 / 55. 19.100
   libavdevice    55.  4.100 / 55.  4.100
   libavfilter     3. 88.101 /  3. 88.101
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.103 /  0. 17.103
   libpostproc    52.  3.100 / 52.  3.100
 [mpeg2video @ 0x20c58c0] Invalid frame dimensions 0x0.
     Last message repeated 2 times
 Input #0, mpegts, from 'NCIS-trim.ts':
   Duration: 00:00:54.76, start: 11120.950633, bitrate: 15319 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)
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.19.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR
 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 tbn, 23.98 tbc
     Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz,
 5.1(side), fltp, 448 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
   Stream #0:1 -> #0:1 (ac3 -> ac3)
 Press [q] to stop, [?] for help
 [mpeg2video @ 0x20c58c0] ac-tex damaged at 19 150:00:52.76
 bitrate=10965.4kbits/s
 [mpeg2video @ 0x20c58c0] Warning MVs not available
 [mpeg2video @ 0x20c58c0] concealing 6360 DC, 6360 AC, 6360 MV errors in B
 frame
 frame= 1038 fps= 56 q=2.0 Lsize=   72747kB time=00:00:54.01
 bitrate=11032.7kbits/s
 video:69718kB audio:2954kB subtitle:0 global headers:0kB muxing overhead
 0.102079%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3019#comment:11>
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