[FFmpeg-trac] #2506(undetermined:new): Guess output frame rate if input timebase denominator is huge

FFmpeg trac at avcodec.org
Sun Apr 28 14:22:39 CEST 2013


#2506: Guess output frame rate if input timebase denominator is huge
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:
               Priority:  wish       |  undetermined
                Version:  git-       |               Keywords:  ogg mpeg4
  master                             |  videolan
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 (Sample from videolan ticket #8486)
 I will upload a sample from a vlc ticket that can be transcoded fine with
 ffmpeg if a framerate is specified, fails with default framerate:
 {{{
 $ ffmpeg -i File\ 50MB\ DG\ Split\ 206\ Video\ Issue.ogm -qscale 2 out.avi
 ffmpeg version N-52542-g5149407 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Apr 28 2013 14:19:06 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 27.101 / 52. 27.101
   libavcodec     55.  6.100 / 55.  6.100
   libavformat    55.  3.100 / 55.  3.100
   libavdevice    55.  0.100 / 55.  0.100
   libavfilter     3. 61.101 /  3. 61.101
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, ogg, from 'File 50MB DG Split 206 Video Issue.ogm':
   Duration: 00:04:41.11, start: 0.000000, bitrate: 1492 kb/s
     Stream #0:0: Video: mpeg4 (XVID / 0x44495658), yuv420p, 576x432, 23.98
 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
     Stream #0:1(English): Audio: vorbis, 48000 Hz, stereo, fltp, 89 kb/s
     Stream #0:2(Japanese): Audio: vorbis, 48000 Hz, stereo, fltp, 89 kb/s
     Stream #0:3(English): Subtitle: text
 Please use -q:a or -q:v, -qscale is ambiguous
 [mpeg4 @ 0x3226520] timebase 417083/10000000 not supported by MPEG 4
 standard, the maximum admitted value for the timebase denominator is 65535
 Output #0, avi, to 'out.avi':
     Stream #0:0: Video: mpeg4, yuv420p, 576x432, q=2-31, 200 kb/s, 90k
 tbn, 23.98 tbc
     Stream #0:1(English): Audio: ac3, 48000 Hz, stereo, fltp
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg4 -> mpeg4)
   Stream #0:1 -> #0:1 (vorbis -> ac3)
 Error while opening encoder for output stream #0:0 - maybe incorrect
 parameters such as bit_rate, rate, width or height
 }}}
 {{{
 $ ffmpeg -i File\ 50MB\ DG\ Split\ 206\ Video\ Issue.ogm -qscale 2 -r
 24000/1001 out.avi
 ffmpeg version N-52542-g5149407 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Apr 28 2013 14:19:06 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 27.101 / 52. 27.101
   libavcodec     55.  6.100 / 55.  6.100
   libavformat    55.  3.100 / 55.  3.100
   libavdevice    55.  0.100 / 55.  0.100
   libavfilter     3. 61.101 /  3. 61.101
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, ogg, from 'File 50MB DG Split 206 Video Issue.ogm':
   Duration: 00:04:41.11, start: 0.000000, bitrate: 1492 kb/s
     Stream #0:0: Video: mpeg4 (XVID / 0x44495658), yuv420p, 576x432, 23.98
 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
     Stream #0:1(English): Audio: vorbis, 48000 Hz, stereo, fltp, 89 kb/s
     Stream #0:2(Japanese): Audio: vorbis, 48000 Hz, stereo, fltp, 89 kb/s
     Stream #0:3(English): Subtitle: text
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.3.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 576x432,
 q=2-31, 200 kb/s, 23.98 tbn, 23.98 tbc
     Stream #0:1(English): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz,
 stereo, fltp, 192 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg4 -> mpeg4)
   Stream #0:1 -> #0:1 (vorbis -> ac3)
 Press [q] to stop, [?] for help
 frame= 6739 fps=1165 q=2.0 Lsize=   96184kB time=00:04:41.19
 bitrate=2802.1kbits/s
 video:89217kB audio:6590kB subtitle:0 global headers:0kB muxing overhead
 0.393439%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2506>
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