Opened 5 months ago

Last modified 4 months ago

#7651 open defect

Corrupted start of mp4 file after "-ss 0 -to XXX -c copy"

Reported by: v0lt Owned by:
Priority: important Component: undetermined
Version: git-master Keywords: mov
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no

Description

Summary of the bug:
The beginning of the file is corrupted when copying data, even if "-ss 0" is specified. Any other value for "-ss" (indicating a keyframe, of course) can also give a problem.
It looks like #7644, but this is a bug.

How to reproduce:
ffmpeg version N-92868-g51b356eef8
I run the following commands.

ffplay "movie.mp4"
ffmpeg -hide_banner -i "movie.mp4" -ss 0.000 -to 603.480 -c copy "movie.1.mp4"
ffplay "movie.1.mp4"

"movie.mp4" plays without errors.
"movie.1.mp4" play with an error at the beginning of the playback.

[mov,mp4,m4a,3gp,3g2,mj2 @ 0000000000459900] Could not find codec parameters for
 stream 0 (Video: h264 (avc1 / 0x31637661), none, 1280x720, 417 kb/s): unspecifi
ed pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options

MPC-HC and MPC-BE players have a black screen at the start of playback.

movie.mp4

Attachments (1)

movie_cut.mp4 (2.4 MB) - added by cehoyos 4 months ago.

Change History (4)

comment:1 Changed 5 months ago by v0lt

Here is an example with a non-zero keyed keyframe.

ffmpeg -i "movie.mp4" -ss 603.480 -to 1207.840 -c copy "movie.2.mp4"
ffplay "movie.2.mp4"

I also noticed that frame 603.480 is in both files (movie.1.mp4 and movie.2.mp4), although the previous frame with time 603.440 is a P-frame. IMHO, it should be the last frame for the movie.1.mp4. I moved the range to "-ss 0.000 -to 603.470", but it did not change anything.

comment:2 follow-up: Changed 4 months ago by cehoyos

  • Keywords mov added
  • Reproduced by developer set
  • Status changed from new to open

For future tickets: Do not use -hide_banner and provide the command line you tested together with the complete, uncut console output to make your tickets valid.
If there is an issue it is a regression since 3fa72de8 / 56ee3f9d

$ ffmpeg -i movie_cut.mp4 -vcodec copy -acodec copy -ss 0 -t 10 out.mov
ffmpeg version N-93028-gd8ebfd1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 6.4.0 (GCC)
  configuration: --enable-opengl --enable-gpl --enable-libxml2 --enable-gnutls --enable-gmp --enable-version3 --enable-libx264
  libavutil      56. 26.100 / 56. 26.100
  libavcodec     58. 44.100 / 58. 44.100
  libavformat    58. 26.100 / 58. 26.100
  libavdevice    58.  6.101 / 58.  6.101
  libavfilter     7. 48.100 /  7. 48.100
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_cut.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2018-10-21T16:02:52.000000Z
  Duration: 00:40:34.73, start: 0.000000, bitrate: 8 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 510 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2018-10-21T16:02:52.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/21/2018.
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2018-10-21T16:02:52.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/21/2018.
Output #0, mov, to 'out.mov':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf58.26.100
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 510 kb/s, 25 fps, 25 tbr, 90k tbn, 90k tbc (default)
    Metadata:
      creation_time   : 2018-10-21T16:02:52.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/21/2018.
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2018-10-21T16:02:52.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/21/2018.
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=  123 fps=0.0 q=-1.0 Lsize=     442kB time=00:00:09.98 bitrate= 362.3kbits/s speed=4.38e+03x
video:282kB audio:154kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.417745%
$ ffmpeg -i out.mov
ffmpeg version N-93028-gd8ebfd1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 6.4.0 (GCC)
  configuration: --enable-opengl --enable-gpl --enable-libxml2 --enable-gnutls --enable-gmp --enable-version3 --enable-libx264
  libavutil      56. 26.100 / 56. 26.100
  libavcodec     58. 44.100 / 58. 44.100
  libavformat    58. 26.100 / 58. 26.100
  libavdevice    58.  6.101 / 58.  6.101
  libavfilter     7. 48.100 /  7. 48.100
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x3dc1240] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1280x720, 469 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf58.26.100
  Duration: 00:00:10.01, start: 0.000000, bitrate: 361 kb/s
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 1280x720, 469 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/21/2018.
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/21/2018.
At least one output file must be specified

The issue disappears with -analyzeduration 6M.

Changed 4 months ago by cehoyos

comment:3 in reply to: ↑ 2 Changed 4 months ago by v0lt

Replying to cehoyos:

The issue disappears with -analyzeduration 6M.

I have not changed anything. I also do not see the title at the beginning when playing movie.1.mp4.
ffmpeg version N-92868-g51b356eef8

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