[FFmpeg-trac] #3520(undetermined:new): Remuxing from flv to swf breaks framerate

[FFmpeg]

#3520: Remuxing from flv to swf breaks framerate
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  flv swf
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 (As reported on the forum.)
 Remuxing from flv to swf produces output files with 232fps that play as
 fast as the system allows.
 {{{
 $ ffmpeg -i fate-suite/flash-vp6/clip1024.flv -vcodec copy out.swf
 ffmpeg version N-62025-g909757f Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Apr  1 2014 22:56:40 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 71.100 / 52. 71.100
   libavcodec     55. 56.107 / 55. 56.107
   libavformat    55. 36.100 / 55. 36.100
   libavdevice    55. 11.100 / 55. 11.100
   libavfilter     4.  3.100 /  4.  3.100
   libswscale      2.  5.102 /  2.  5.102
   libswresample   0. 18.100 /  0. 18.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, flv, from 'fate-suite/flash-vp6/clip1024.flv':
   Metadata:
     audiodelay      : 0
     creationdate    : Fri Sep 02 16:45:11 2005
                     :
   Duration: 00:00:17.30, start: 0.000000, bitrate: 51 kb/s
     Stream #0:0: Video: vp6f, yuv420p, 112x80, 49 kb/s, 10 tbr, 1k tbn, 1k
 tbc
 Output #0, swf, to 'out.swf':
   Metadata:
     audiodelay      : 0
     creationdate    : Fri Sep 02 16:45:11 2005
                     :
     encoder         : Lavf55.36.100
     Stream #0:0: Video: vp6f, yuv420p, 112x80, q=2-31, 49 kb/s, 90k tbn,
 1k tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 frame=  174 fps=0.0 q=-1.0 Lsize=     109kB time=00:00:17.30 bitrate=
 51.7kbits/s
 video:106kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 3.095598%
 $ ffmpeg -i out.swf
 ffmpeg version N-62025-g909757f Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Apr  1 2014 22:56:40 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 71.100 / 52. 71.100
   libavcodec     55. 56.107 / 55. 56.107
   libavformat    55. 36.100 / 55. 36.100
   libavdevice    55. 11.100 / 55. 11.100
   libavfilter     4.  3.100 /  4.  3.100
   libswscale      2.  5.102 /  2.  5.102
   libswresample   0. 18.100 /  0. 18.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, swf, from 'out.swf':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: vp6f, yuv420p, 112x80, 232 fps, 232 tbr, 232 tbn
 At least one output file must be specified
 }}}
 {{{
 $ make fate-lavf-flv_fmt
 $ ffmpeg -i tests/data/lavf/lavf.flv -vcodec copy out2.swf
 ffmpeg version N-62025-g909757f Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Apr  1 2014 22:56:40 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 71.100 / 52. 71.100
   libavcodec     55. 56.107 / 55. 56.107
   libavformat    55. 36.100 / 55. 36.100
   libavdevice    55. 11.100 / 55. 11.100
   libavfilter     4.  3.100 /  4.  3.100
   libswscale      2.  5.102 /  2.  5.102
   libswresample   0. 18.100 /  0. 18.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, flv, from 'tests/data/lavf/lavf.flv':
   Metadata:
     title           : lavftest
   Duration: 00:00:01.00, start: 0.000000, bitrate: 2636 kb/s
     Stream #0:0: Video: flv1, yuv420p, 352x288, 200 kb/s, 25 tbr, 1k tbn,
 1k tbc
 Output #0, swf, to 'out2.swf':
   Metadata:
     title           : lavftest
     encoder         : Lavf55.36.100
     Stream #0:0: Video: flv1, yuv420p, 352x288, q=2-31, 200 kb/s, 90k tbn,
 1k tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 frame=   25 fps=0.0 q=-1.0 Lsize=     322kB time=00:00:00.96
 bitrate=2742.8kbits/s
 video:321kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.159599%
 $ ffmpeg -i out2.swf
 ffmpeg version N-62025-g909757f Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Apr  1 2014 22:56:40 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 71.100 / 52. 71.100
   libavcodec     55. 56.107 / 55. 56.107
   libavformat    55. 36.100 / 55. 36.100
   libavdevice    55. 11.100 / 55. 11.100
   libavfilter     4.  3.100 /  4.  3.100
   libswscale      2.  5.102 /  2.  5.102
   libswresample   0. 18.100 /  0. 18.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, swf, from 'out2.swf':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: flv1, yuv420p, 352x288, 232 fps, 232 tbr, 232 tbn
 At least one output file must be specified
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3520>
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