[FFmpeg-trac] #8173(ffmpeg:new): MKV - All streams marked as default when trying to remove all dispositions

FFmpeg trac at avcodec.org
Wed Sep 18 04:57:16 EEST 2019


#8173: MKV - All streams marked as default when trying to remove all dispositions
-------------------------------------+-------------------------------------
             Reporter:  nheelyolis   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:               |  master
  mkv,disposition                    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 == Summary of the bug ==
 When trying to demux or encode an MKV file to another MKV file, all
 streams get marked as "default" when I'm trying to delete all dispositions
 in that file with {{{-disposition[:stream_specifier] 0}}}. You can't see
 it during the process itself, but if you do a {{{ffprobe}}} on the
 resulted file, you'll see that all its streams are marked as default.

 Even if it's expected behavior (which doesn't look so to me), why doesn't
 it say that the output streams will be default during encoding/demuxing?

 == How to reproduce ==
 1. Take any MKV file which has at least 1 stream marked as default.
 2. Demux this file deleting all its dispositions.
 {{{
 % ffmpeg -i in.mkv -map 0 -disposition:v:0 0 -c copy out.mkv
 ffmpeg version N-94959-g96f1d34d0c Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 9.1.0 (GCC)
   configuration:
   libavutil      56. 35.100 / 56. 35.100
   libavcodec     58. 57.100 / 58. 57.100
   libavformat    58. 32.104 / 58. 32.104
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.102 /  7. 58.102
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
 Input #0, matroska,webm, from 'in.mkv':
   Metadata:
     ENCODER         : Lavf58.29.100
   Duration: 00:14:48.06, start: -0.007000, bitrate: 3437 kb/s
     Stream #0:0(eng): Video: vp8, yuv420p(progressive), 1920x818, SAR 1:1
 DAR 960:409, 24 fps, 24 tbr, 1k tbn, 1k tbc (default)
     Metadata:
       DURATION        : 00:14:48.055000000
     Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp
     Metadata:
       DURATION        : 00:14:48.061000000
     Stream #0:2(eng): Subtitle: webvtt
     Metadata:
       DURATION        : 00:10:29.807000000
 Output #0, matroska, to 'out.mkv':
   Metadata:
     encoder         : Lavf58.32.104
     Stream #0:0(eng): Video: vp8 (VP80 / 0x30385056),
 yuv420p(progressive), 1920x818 [SAR 1:1 DAR 960:409], q=2-31, 24 fps, 24
 tbr, 1k tbn, 1k tbc
     Metadata:
       DURATION        : 00:14:48.055000000
     Stream #0:1(eng): Audio: opus ([255][255][255][255] / 0xFFFFFFFF),
 48000 Hz, stereo, fltp
     Metadata:
       DURATION        : 00:14:48.061000000
     Stream #0:2(eng): Subtitle: webvtt
     Metadata:
       DURATION        : 00:10:29.807000000
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
   Stream #0:2 -> #0:2 (copy)
 Press [q] to stop, [?] for help
 frame=22308 fps=13499 q=-1.0 Lsize=  372673kB time=00:14:48.04
 bitrate=3437.8kbits/s speed= 537x
 video:358428kB audio:13768kB subtitle:1kB other streams:0kB global
 headers:0kB muxing overhead: 0.127906%
 }}}

 3. Probe the resulted file and notice that all the streams are "default".
 {{{
 % ffprobe out.mkv
 ffprobe version N-94959-g96f1d34d0c Copyright (c) 2007-2019 the FFmpeg
 developers
   built with gcc 9.1.0 (GCC)
   configuration:
   libavutil      56. 35.100 / 56. 35.100
   libavcodec     58. 57.100 / 58. 57.100
   libavformat    58. 32.104 / 58. 32.104
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.102 /  7. 58.102
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
 Input #0, matroska,webm, from 'out.mkv':
   Metadata:
     ENCODER         : Lavf58.32.104
   Duration: 00:14:48.06, start: -0.007000, bitrate: 3437 kb/s
     Stream #0:0(eng): Video: vp8, yuv420p(progressive), 1920x818, SAR 1:1
 DAR 960:409, 24 fps, 24 tbr, 1k tbn, 1k tbc (default)
     Metadata:
       DURATION        : 00:14:48.062000000
     Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
     Metadata:
       DURATION        : 00:14:48.061000000
     Stream #0:2(eng): Subtitle: webvtt (default)
     Metadata:
       DURATION        : 00:10:29.814000000
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8173>
FFmpeg <https://ffmpeg.org>
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