[FFmpeg-trac] #2929(avformat:new): Wrong duration estimation for dvvideo in mxf

[FFmpeg]

#2929: Wrong duration estimation for dvvideo in mxf
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:  avformat
               Priority:  wish       |               Keywords:  mxf dvvideo
                Version:  git-       |               Blocking:
  master                             |  Analyzed by developer:  0
             Blocked By:             |
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/47691
 A user provided a sample with incorrectly estimated duration because the
 mxf demuxer stores no bitrate for dvvideo.
 {{{
 $ ffmpeg -i TESTSMOKE.mxf -f null -
 ffmpeg version N-55962-gec8a484 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Sep  2 2013 10:17:48 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --enable-libzvbi --disable-indev=jack
   libavutil      52. 43.100 / 52. 43.100
   libavcodec     55. 31.100 / 55. 31.100
   libavformat    55. 15.100 / 55. 15.100
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 82.102 /  3. 82.102
   libswscale      2.  5.100 /  2.  5.100
   libswresample   0. 17.103 /  0. 17.103
   libpostproc    52.  3.100 / 52.  3.100
 [mxf @ 0x3699880] Estimating duration from bitrate, this may be inaccurate
 Guessed Channel Layout for  Input Stream #0.1 : stereo
 Input #0, mxf, from 'TESTSMOKE.mxf':
   Metadata:
     uid             : 058bb481-067c-11e3-9682-a8968af1e82e
     generation_uid  : 058bb482-067c-11e3-a20e-a8968af1e82e
     company_name    : Autodesk
     product_name    : Smoke
     product_version : 2013
     application_platform: Mac OS X
     product_uid     : ec500c00-9200-11dc-940c-000d605329fa
     modification_date: 2013-08-16 13:59:09
     timecode        : 00:00:00:00
   Duration: 00:02:10.48, start: 0.000000, bitrate: 2303 kb/s
     Stream #0:0: Video: dvvideo, yuv422p, 720x576 [SAR 16:15 DAR 4:3], 25
 fps, 25 tbr, 25 tbn, 25 tbc
     Stream #0:1: Audio: pcm_s24le, 48000 Hz, stereo, s32, 2304 kb/s
 Output #0, null, to 'pipe:':
   Metadata:
     uid             : 058bb481-067c-11e3-9682-a8968af1e82e
     generation_uid  : 058bb482-067c-11e3-a20e-a8968af1e82e
     company_name    : Autodesk
     product_name    : Smoke
     product_version : 2013
     application_platform: Mac OS X
     product_uid     : ec500c00-9200-11dc-940c-000d605329fa
     modification_date: 2013-08-16 13:59:09
     timecode        : 00:00:00:00
     encoder         : Lavf55.15.100
     Stream #0:0: Video: rawvideo (Y42B / 0x42323459), yuv422p, 720x576
 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 90k tbn, 25 tbc
     Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (dvvideo -> rawvideo)
   Stream #0:1 -> #0:1 (pcm_s24le -> pcm_s16le)
 Press [q] to stop, [?] for help
 [null @ 0x369d9a0] Encoder did not produce proper pts, making some up.
 frame=  125 fps=0.0 q=0.0 Lsize=N/A time=00:00:05.00 bitrate=N/A
 video:12kB audio:938kB subtitle:0 global headers:0kB muxing overhead
 -100.002263%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2929>
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