[FFmpeg-trac] #2700(undetermined:new): Stream mapping not predictable when using -ss option

[FFmpeg]

#2700: Stream mapping not predictable when using -ss option
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  claudelepoisson                    |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  mpegps       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 {{{
 $ ffmpeg -i fate-suite/svq3/Vertical400kbit.sorenson3.mov -qscale 15 -t 3
 out.mpg
 }}}
 {{{
 $ ffmpeg -i out.mpg -acodec copy -vcodec copy -t 1 -ss 2 av.mpg
 ffmpeg version N-54166-g5dba888 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jun 24 2013 08:54:40 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 37.101 / 52. 37.101
   libavcodec     55. 16.100 / 55. 16.100
   libavformat    55.  9.100 / 55.  9.100
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 77.101 /  3. 77.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mpeg, from 'out.mpg':
   Duration: 00:00:02.98, start: 0.522422, bitrate: 297 kb/s
     Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR
 4:3], 104857 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc
     Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
 Output #0, mpeg, to 'av.mpg':
   Metadata:
     encoder         : Lavf55.9.100
     Stream #0:0: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR 4:3],
 q=2-31, 104857 kb/s, 30 fps, 90k tbn, 30 tbc
     Stream #0:1: Audio: mp2, 44100 Hz, mono, 128 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 frame=   18 fps=0.0 q=-1.0 Lsize=      34kB time=00:00:01.00 bitrate=
 277.4kbits/s
 video:17kB audio:16kB subtitle:0 global headers:0kB muxing overhead
 3.637554%
 }}}
 {{{
 $ ffmpeg -i out.mpg -acodec copy -vcodec copy -t 1 -ss 1 va.mpg
 ffmpeg version N-54166-g5dba888 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jun 24 2013 08:54:40 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 37.101 / 52. 37.101
   libavcodec     55. 16.100 / 55. 16.100
   libavformat    55.  9.100 / 55.  9.100
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 77.101 /  3. 77.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mpeg, from 'out.mpg':
   Duration: 00:00:02.98, start: 0.522422, bitrate: 297 kb/s
     Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR
 4:3], 104857 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc
     Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
 Output #0, mpeg, to 'va.mpg':
   Metadata:
     encoder         : Lavf55.9.100
     Stream #0:0: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR 4:3],
 q=2-31, 104857 kb/s, 30 fps, 90k tbn, 30 tbc
     Stream #0:1: Audio: mp2, 44100 Hz, mono, 128 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 frame=   25 fps=0.0 q=-1.0 Lsize=      34kB time=00:00:01.01 bitrate=
 275.4kbits/s
 video:17kB audio:16kB subtitle:0 global headers:0kB muxing overhead
 5.570211%
 }}}
 {{{
 $ ffmpeg -i av.mpg -i va.mpg
 ffmpeg version N-54166-g5dba888 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jun 24 2013 08:54:40 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 37.101 / 52. 37.101
   libavcodec     55. 16.100 / 55. 16.100
   libavformat    55.  9.100 / 55.  9.100
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 77.101 /  3. 77.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mpeg, from 'av.mpg':
   Duration: 00:00:00.89, start: 0.500000, bitrate: 313 kb/s
     Stream #0:0[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
     Stream #0:1[0x1e0]: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR
 4:3], 104857 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc
 Input #1, mpeg, from 'va.mpg':
   Duration: 00:00:00.99, start: 0.500000, bitrate: 280 kb/s
     Stream #1:0[0x1e0]: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR
 4:3], 104857 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc
     Stream #1:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
 At least one output file must be specified
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2700#comment:2>
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