[FFmpeg-trac] #2451(undetermined:new): Inputting some webM files screws up output playback

[FFmpeg]

#2451: Inputting some webM files screws up output playback
-------------------------------------+-------------------------------------
             Reporter:  nealzebub    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  fps          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => fps
 * version:  unspecified => git-master


Comment:

 You have to specify a framerate if you want to convert this sample to
 isom.
 {{{
 $ ffmpeg -i RRSF49.webm -qscale 2 -strict -2 -r 24000/1001 out.mp4
 ffmpeg version N-51678-g1f2ce32 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Apr  8 2013 20:35:54 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 25.100 / 52. 25.100
   libavcodec     55.  2.100 / 55.  2.100
   libavformat    55.  1.100 / 55.  1.100
   libavdevice    55.  0.100 / 55.  0.100
   libavfilter     3. 49.100 /  3. 49.100
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 Input #0, matroska,webm, from 'RRSF49.webm':
   Duration: 00:00:31.79, start: 0.000000, bitrate: 436 kb/s
     Stream #0:0(eng): Video: vp8, yuv420p, 640x360, SAR 1:1 DAR 16:9, 1k
 fps, 1k tbr, 1k tbn, 1k tbc (default)
     Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
 Please use -q:a or -q:v, -qscale is ambiguous
 File 'out.mp4' already exists. Overwrite ? [y/N] y
 Output #0, mp4, to 'out.mp4':
   Metadata:
     encoder         : Lavf55.1.100
     Stream #0:0(eng): Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 640x360
 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 24k tbn, 23.98 tbc (default)
     Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo,
 fltp, 128 kb/s (default)
 Stream mapping:
   Stream #0:0 -> #0:0 (vp8 -> mpeg4)
   Stream #0:1 -> #0:1 (vorbis -> aac)
 Press [q] to stop, [?] for help
 frame=  762 fps=719 q=2.0 Lsize=    5053kB time=00:00:31.81
 bitrate=1301.1kbits/s
 video:4537kB audio:492kB subtitle:0 global headers:0kB muxing overhead
 0.483038%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2451#comment:1>
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