[FFmpeg-trac] #6162(undetermined:new): concat protocol can't concat the same mp4 file?

[FFmpeg]

#6162: concat protocol can't concat the same mp4 file?
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  JohnHawkinson                      |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  concat       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by JohnHawkinson):

 Oops, max filesize for attachments is too large for short5.mp4. So I
 repeated the above tests with short1.mp4, a 1 second extract instead of a
 5-second extract, produced with:
 {{{
 $ ffmpeg -t 1 -i ../MVI_6105.mp4 -c copy short1.mp4
 ffmpeg version git-2017-02-19-3206ea4 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with Apple LLVM version 7.0.2 (clang-700.1.81)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD-3206ea4 --enable-
 shared --enable-pthreads --enable-gpl --enable-version3 --enable-
 hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-
 ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-
 opencl --disable-lzma --enable-vda
   libavutil      55. 47.100 / 55. 47.100
   libavcodec     57. 80.101 / 57. 80.101
   libavformat    57. 66.102 / 57. 66.102
   libavdevice    57.  2.100 / 57.  2.100
   libavfilter     6. 73.100 /  6. 73.100
   libavresample   3.  2.  0 /  3.  2.  0
   libswscale      4.  3.101 /  4.  3.101
   libswresample   2.  4.100 /  2.  4.100
   libpostproc    54.  2.100 / 54.  2.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../MVI_6105.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 1
     compatible_brands: mp42avc1CAEP
     copyright       :
     copyright-eng   :
     creation_time   : 2017-02-14T22:11:24.000000Z
   Duration: 00:24:26.57, start: 0.000000, bitrate: 7509 kb/s
     Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
 bt709), 1280x720, 7372 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc
 (default)
     Metadata:
       creation_time   : 2017-02-14T22:11:24.000000Z
     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 127 kb/s (default)
     Metadata:
       creation_time   : 2017-02-14T22:11:24.000000Z
 Output #0, mp4, to 'short1.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 1
     compatible_brands: mp42avc1CAEP
     copyright       :
     copyright-eng   :
     encoder         : Lavf57.66.102
     Stream #0:0(eng): Video: h264 (High) ([33][0][0][0] / 0x0021),
 yuv420p(tv, bt709), 1280x720, q=2-31, 7372 kb/s, 29.97 fps, 29.97 tbr, 30k
 tbn, 30k tbc (default)
     Metadata:
       creation_time   : 2017-02-14T22:11:24.000000Z
     Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz,
 stereo, fltp, 127 kb/s (default)
     Metadata:
       creation_time   : 2017-02-14T22:11:24.000000Z
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 frame=   33 fps=0.0 q=-1.0 Lsize=    1170kB time=00:00:00.98
 bitrate=9768.2kbits/s speed= 538x
 video:1152kB audio:16kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.199943%
 }}}

 Pretty much the same results.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6162#comment:1>
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