[FFmpeg-trac] #2574(avcodec:new): Uneven speed when reencoding mpeg program stream

FFmpeg trac at avcodec.org
Wed May 15 17:46:15 CEST 2013


#2574: Uneven speed when reencoding mpeg program stream
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:  avcodec
                Version:  git-       |               Keywords:  mpeg2video
  master                             |  regression
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/45738
 A user uploaded a sample that reencodes into a file with uneven speed with
 ffmpeg and shows uneven playback with ffplay and mplayer -vc ffmpeg12,
 plays fine with mplayer -vc mpeg12
 This is a regression since 0127b86
 {{{
 $ ffmpeg -i BAGUTTI\ CAREZZE_cut.mpg -qscale 2 -t 7 out.avi
 ffmpeg version N-53092-gc45b823 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on May 15 2013 17:44:48 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 32.100 / 52. 32.100
   libavcodec     55.  9.100 / 55.  9.100
   libavformat    55.  7.100 / 55.  7.100
   libavdevice    55.  0.100 / 55.  0.100
   libavfilter     3. 67.100 /  3. 67.100
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mpeg, from 'BAGUTTI CAREZZE_cut.mpg':
   Duration: 00:00:07.28, start: 0.168444, bitrate: 8439 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.7.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x576 [SAR
 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
     Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp,
 192 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
   Stream #0:1 -> #0:1 (mp2 -> ac3)
 Press [q] to stop, [?] for help
 frame=  171 fps=0.0 q=2.0 Lsize=    5954kB time=00:00:07.00
 bitrate=6960.2kbits/s
 video:5771kB audio:164kB subtitle:0 global headers:0kB muxing overhead
 0.321262%
 }}}
 out.avi "pauses" for a moment after four seconds.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2574>
FFmpeg <http://ffmpeg.org>
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