Opened 7 years ago

Closed 7 years ago

Last modified 7 years ago

#6162 closed defect (invalid)

concat protocol can't concat the same mp4 file?

Reported by: John Hawkinson Owned by:
Priority: normal Component: undetermined
Version: git-master Keywords:
Cc: john.hawkinson@gmail.com, john.hawkinson.fwd@gmail.com Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Summary of the bug: concat protocol can't concat the same mp4 file?

Attempting to combine a 5-second MP4 file with a copy of itself fails, and produces a 5-second MP4 output instead of a 10-second one.

How to reproduce:

# Produce a manageable file:
$ ffmpeg -t 5 MVI_6105.mp4 -c copy short5.mp4
$ ffmpeg -i concat:'short5.mp4|short5.mp4' 2x5.mp4 # fails
$ ffmpeg -i concat:'short5.mp4|short5.mp4' -c copy 2x5c.mp4 # also fails
$ cp short5.mp4 short5dupe.mp4
$ ffmpeg -i concat:'short5.mp4|short5dupe.mp4' -c copy 2x5c2.mp4 # also also fails

# Here we are with copious output, and some ffprobe -ing as well:

$ ffprobe MVI_6105.mp4
ffprobe version git-2017-02-19-3206ea4 Copyright (c) 2007-2017 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

$ ffmpeg -t 5 -i ../MVI_6105.mp4 -c copy short5.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 'short5.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=  153 fps=0.0 q=-1.0 Lsize=    4945kB time=00:00:04.99 bitrate=8114.3kbits/s speed= 321x    
video:4860kB audio:78kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.128599%
$ ffprobe short5.mp4 
ffprobe version git-2017-02-19-3206ea4 Copyright (c) 2007-2017 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 'short5.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.66.102
  Duration: 00:00:05.11, start: 0.000000, bitrate: 7933 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 7799 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

$ ffmpeg -i concat:'short5.mp4|short5.mp4' 2x5.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
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb94900da00] Found duplicated MOOV Atom. Skipped it
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'concat:short5.mp4|short5.mp4':
  Metadata:
    encoder         : Lavf57.66.102
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
  Duration: 00:00:05.11, start: 0.000000, bitrate: 15866 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 7799 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[libx264 @ 0x7fb949011600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fb949011600] profile High, level 3.1
[libx264 @ 0x7fb949011600] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '2x5.mp4':
  Metadata:
    compatible_brands: isomiso2avc1mp41
    major_brand     : isom
    minor_version   : 512
    encoder         : Lavf57.66.102
    Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc57.80.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc57.80.101 aac
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
frame=  151 fps= 37 q=-1.0 Lsize=     814kB time=00:00:05.01 bitrate=1329.5kbits/s speed=1.23x    
video:726kB audio:81kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.825945%
[libx264 @ 0x7fb949011600] frame I:1     Avg QP:22.06  size: 30505
[libx264 @ 0x7fb949011600] frame P:38    Avg QP:22.24  size: 11265
[libx264 @ 0x7fb949011600] frame B:112   Avg QP:24.77  size:  2536
[libx264 @ 0x7fb949011600] consecutive B-frames:  0.7%  0.0%  4.0% 95.4%
[libx264 @ 0x7fb949011600] mb I  I16..4: 26.2% 57.1% 16.7%
[libx264 @ 0x7fb949011600] mb P  I16..4:  3.4%  5.1%  0.6%  P16..4: 31.6%  9.4%  6.0%  0.0%  0.0%    skip:43.9%
[libx264 @ 0x7fb949011600] mb B  I16..4:  0.5%  1.1%  0.0%  B16..8: 29.4%  2.1%  0.3%  direct: 0.7%  skip:65.9%  L0:42.1% L1:53.0% BI: 4.9%
[libx264 @ 0x7fb949011600] 8x8 transform intra:60.1% inter:78.8%
[libx264 @ 0x7fb949011600] coded y,uvDC,uvAC intra: 24.4% 23.6% 4.5% inter: 5.5% 5.4% 0.0%
[libx264 @ 0x7fb949011600] i16 v,h,dc,p: 27% 35% 10% 28%
[libx264 @ 0x7fb949011600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 23% 38%  3%  4%  3%  4%  3%  3%
[libx264 @ 0x7fb949011600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 19% 12%  5%  6%  6%  6%  7%  4%
[libx264 @ 0x7fb949011600] i8c dc,h,v,p: 73% 13% 13%  2%
[libx264 @ 0x7fb949011600] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fb949011600] ref P L0: 61.6%  9.9% 20.4%  8.2%
[libx264 @ 0x7fb949011600] ref B L0: 83.1% 13.2%  3.7%
[libx264 @ 0x7fb949011600] ref B L1: 93.4%  6.6%
[libx264 @ 0x7fb949011600] kb/s:1179.15
[aac @ 0x7fb949014e00] Qavg: 815.755

pb3:test jhawk$ ffmpeg -i concat:'short5.mp4|short5.mp4' -c copy 2x5c.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
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f88eb000000] Found duplicated MOOV Atom. Skipped it
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'concat:short5.mp4|short5.mp4':
  Metadata:
    encoder         : Lavf57.66.102
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
  Duration: 00:00:05.11, start: 0.000000, bitrate: 15866 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 7799 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Output #0, mp4, to '2x5c.mp4':
  Metadata:
    compatible_brands: isomiso2avc1mp41
    major_brand     : isom
    minor_version   : 512
    encoder         : Lavf57.66.102
    Stream #0:0(eng): Video: h264 (High) ([33][0][0][0] / 0x0021), yuv420p(tv, bt709), 1280x720, q=2-31, 7799 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=  153 fps=0.0 q=-1.0 Lsize=    4945kB time=00:00:04.99 bitrate=8114.3kbits/s speed= 671x    
video:4860kB audio:78kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.128757%

$ ffprobe 2x5.mp4
ffprobe version git-2017-02-19-3206ea4 Copyright (c) 2007-2017 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 '2x5.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.66.102
  Duration: 00:00:05.04, start: 0.000000, bitrate: 1322 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1180 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 131 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

Attachments (1)

short1.mp4​ (1.1 MB ) - added by John Hawkinson 7 years ago.
1 second extract of video

Download all attachments as: .zip

Change History (9)

by John Hawkinson, 7 years ago

Attachment: short1.mp4​ added

1 second extract of video

comment:1 by John Hawkinson, 7 years ago

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.

comment:2 by John Hawkinson, 7 years ago

Cc: john.hawkinson@gmail.com added

comment:3 by John Hawkinson, 7 years ago

Cc: john.hawkinson.fwd@gmail.com added

comment:4 by Carl Eugen Hoyos, 7 years ago

Keywords: concat removed
Resolution: → invalid
Status: new → closed

The concat protocol cannot work for mov files.

comment:5 by John Hawkinson, 7 years ago

Can we get more user-friendly diagnostics in this case? An error message, an explanation of why, an update to the manpage and maybe to ​https://trac.ffmpeg.org/wiki/Concatenate#protocol?

Rereading the wiki page, if it's true that this basically only works for mpegts and mpg files, it should be easy to check for.

Having ffmpeg behave like it works but then not actually working is not a great outcome.

in reply to:  5 ; comment:6 by Carl Eugen Hoyos, 7 years ago

Replying to JohnHawkinson:

Can we get more user-friendly diagnostics in this case? An error message, an explanation of why,

an update to the manpage and maybe to ​https://trac.ffmpeg.org/wiki/Concatenate#protocol?

The wiki is a wiki, feel free to update.

Rereading the wiki page, if it's true that this basically only works for mpegts and mpg files

It works for all raw formats.

it should be easy to check for.

Then please send a patch.
(Yes, I overreact on easy.)

in reply to:  6 ; comment:7 by John Hawkinson, 7 years ago

Replying to cehoyos:

The wiki is a wiki, feel free to update.

I'd be happy to, but I do want to make sure I understand properly what the constraints are; I wouldn't want to publish wrong information there. Specifically:

Rereading the wiki page, if it's true that this basically only works for mpegts and mpg files

It works for all raw formats.

What is the definition of "raw format"? I presume it means without some sort of container (but not without any periodic headers), but I'm not sure how to tell what kind of format is a raw format and what isn't. Just saying "raw format" in the wiki isn't necessarily going to help a user determine whether their .MP4 file is a "raw format" or not.

Thanks.

in reply to:  7 comment:8 by Carl Eugen Hoyos, 7 years ago

Replying to JohnHawkinson:

Replying to cehoyos:

Rereading the wiki page, if it's true that this basically only works for mpegts and mpg files

It works for all raw formats.

What is the definition of "raw format"?

I fear there is no strict definition.

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