Après avoir exécuté cette commande ffmpeg -f concat -i mylist.txt -c copy output.mp4- je reçois un output.mp4fichier corrompu et ce message:
ffmpeg -f concat -i mylist.txt -c copy output.mp4
ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  libavutil      54. 20.100 / 54. 20.100
  libavcodec     56. 26.100 / 56. 26.100
  libavformat    56. 25.101 / 56. 25.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 11.102 /  5. 11.102
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, concat, from 'mylist.txt':
  Duration: N/A, start: 0.000000, bitrate: 829 kb/s
    Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1440x900, 701 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf56.25.101
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1440x900, q=2-31, 701 kb/s, 30 fps, 30 tbr, 15360 tbn, 15360 tbc
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0x7f897a01bc00] Non-monotonous DTS in output stream 0:0; previous: 598061, current: 467644; changing to 598062. This may result in incorrect timestamps in the output file.
[mp4 @ 0x7f897a01bc00] Non-monotonous DTS in output stream 0:0; previous: 598062, current: 468044; changing to 598063. This may result in incorrect timestamps in the output file.
[mp4 @ 0x7f897a01bc00] Non-monotonous DTS in output stream 0:0; previous: 598063, current: 468444; changing to 598064. This may result in incorrect timestamps in the output file.
...
[mp4 @ 0x7f897a01bc00] Non-monotonous DTS in output stream 0:0; previous: 598362, current: 588044; changing to 598363. This may result in incorrect timestamps in the output file.
frame= 1472 fps=0.0 q=-1.0 Lsize=    5825kB time=00:00:49.04 bitrate= 973.0kbits/s
video:4903kB audio:877kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.776358%
Contenu de mylist.txt
file 'cut.mp4'
file 'cut2.mp4'
sortie cut.mp4 de ffmpeg:
ffmpeg -i cut.mp4
ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  libavutil      54. 20.100 / 54. 20.100
  libavcodec     56. 26.100 / 56. 26.100
  libavformat    56. 25.101 / 56. 25.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 11.102 /  5. 11.102
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cut.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.25.101
  Duration: 00:00:39.04, start: 0.036281, bitrate: 837 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1440x900, 701 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
sortie cut2.mp4 de ffmpeg:
ffmpeg -i cut2.mp4
ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  libavutil      54. 20.100 / 54. 20.100
  libavcodec     56. 26.100 / 56. 26.100
  libavformat    56. 25.101 / 56. 25.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 11.102 /  5. 11.102
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cut2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.25.101
  Duration: 00:00:10.07, start: 0.000000, bitrate: 1498 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1440x900, 1271 kb/s, 30 fps, 30 tbr, 12k tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 218 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
cut.mp4 J'ai obtenu par cette commande ffmpeg -ss 00:00:11 -i myfile.mp4 -to 00:00:39 -vf 'drawbox= : x=0 : y=0 : color=invert' cut.mp4
cut2.mp4 J'ai obtenu par cette commande ffmpeg -ss 00:00:00 -i myfile.mp4 -to 00:00:10 -c copy cut2.mp4
J'ai beaucoup cherché - je n'ai trouvé aucune solution, peut-être que quelqu'un peut m'aider avec celle-ci.
output.mp4 est jouable, mais semble bizarre.

-c copypour autoriser le réencodage ou l'utilisation -c:a copyuniquement. Ensuite, l'étape de concaténation peut toujours être utilisée -c copycar toutes les vidéos sont déjà ré-encodées. Notez que certaines vidéos avec cet avertissement semblent toujours correctes après la concaténation et donc tout -c copyva bien.