Opened 6 months ago

#7184 new defect

ffmetadata time are not treated as miliseconds as documentation says

Reported by: jonata Owned by:
Priority: normal Component: ffmpeg
Version: git-master Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Summary: documentation says that ffmetadata time information (ex. "START", "END") needs to be written in miliseconds:

https://ffmpeg.org/ffmpeg-formats.html#Metadata-1

7. ... If the timebase is missing then start/end times are assumed to be in milliseconds.

The documentation should say nanosecond, or ffmpeg is not reading this information correctly.

How to reproduce:

Test movie file:
https://archive.org/download/mov-bbb/mov_bbb.mp4

In this example, I am not specifying the TIMEBASE, because the documentation says that if this information is not present, ffmpeg will consider times as miliseconds int.

I want a chapter at 1 sec and at 2 sec. Milisecond is a thousandth of a second.
(https://en.wikipedia.org/wiki/Millisecond).

1 * 1.000 = 1000
2 * 1.000 = 2000

Considering the following is the content of "chapters.txt":

;FFMETADATA1

[CHAPTER]
START=1000
END=2000
title=First chapter

[CHAPTER]
START=2000
END=4000
title=Second chapter  should start at 2 sec

Applying chapters:

ffmpeg -i mov_bbb.mp4 -i chapters.txt -map_chapters 1 -c:a copy -c:v copy mov_bbb_with_chapters.mp4
ffmpeg version N-90883-g29fd44adf1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-version3
  libavutil      56. 17.100 / 56. 17.100
  libavcodec     58. 19.100 / 58. 19.100
  libavformat    58. 13.100 / 58. 13.100
  libavdevice    58.  4.100 / 58.  4.100
  libavfilter     7. 20.100 /  7. 20.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mov_bbb.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2012-03-13T08:58:06.000000Z
    encoder         : HandBrake 0.9.6 2012022800
  Duration: 00:00:10.03, start: 0.000000, bitrate: 629 kb/s
    Chapter #0:0: start 0.000000, end 10.000000
    Metadata:
      title           : Chapter 1
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 320x176, 300 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
      encoder         : JVT/AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
    Stream #0:3(und): Data: bin_data (text / 0x74786574), 0 kb/s
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
Input #1, ffmetadata, from 'chapters.txt':
  Duration: 00:00:00.00, start: 0.000000, bitrate: 280000 kb/s
    Chapter #1:0: start 0.000001, end 0.000002
    Metadata:
      title           : First chapter
    Chapter #1:1: start 0.000002, end 0.000004
    Metadata:
      title           : Second chapter  should start at 2 sec
Output #0, mp4, to 'mov_bbb_with_chapters.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    encoder         : Lavf58.13.100
    Chapter #0:0: start 0.000001, end 0.000002
    Metadata:
      title           : First chapter
    Chapter #0:1: start 0.000002, end 0.000004
    Metadata:
      title           : Second chapter  should start at 2 sec
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 320x176, q=2-31, 300 kb/s, 25 fps, 25 tbr, 90k tbn, 90k tbc (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
      encoder         : JVT/AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=  250 fps=0.0 q=-1.0 Lsize=     573kB time=00:00:10.00 bitrate= 469.0kbits/s speed= 430x    
video:367kB audio:197kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.671260%

As shown in output, the chapters are not in the correct place.

So, I need to convert the times to nanosecond, that is is a thousand-millionth of a second.
(https://en.wikipedia.org/wiki/Nanosecond).

1 * 1.000.000.000 = 1000000000
2 * 1.000.000.000 = 2000000000

Considering the following is the content of "chapters.txt":

;FFMETADATA1

[CHAPTER]
START=1000000000
END=2000000000
title=First chapter

[CHAPTER]
START=2000000000
END=4000000000
title=Second chapter  should start at 2 sec

Applying chapters:

ffmpeg -i mov_bbb.mp4 -i chapters.txt -map_chapters 1 -c:a copy -c:v copy mov_bbb_with_chapters.mp4
ffmpeg version N-90883-g29fd44adf1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-version3
  libavutil      56. 17.100 / 56. 17.100
  libavcodec     58. 19.100 / 58. 19.100
  libavformat    58. 13.100 / 58. 13.100
  libavdevice    58.  4.100 / 58.  4.100
  libavfilter     7. 20.100 /  7. 20.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mov_bbb.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2012-03-13T08:58:06.000000Z
    encoder         : HandBrake 0.9.6 2012022800
  Duration: 00:00:10.03, start: 0.000000, bitrate: 629 kb/s
    Chapter #0:0: start 0.000000, end 10.000000
    Metadata:
      title           : Chapter 1
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 320x176, 300 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
      encoder         : JVT/AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
    Stream #0:3(und): Data: bin_data (text / 0x74786574), 0 kb/s
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
Input #1, ffmetadata, from 'chapters.txt':
  Duration: 00:00:04.00, start: 0.000000, bitrate: 0 kb/s
    Chapter #1:0: start 1.000000, end 2.000000
    Metadata:
      title           : First chapter
    Chapter #1:1: start 2.000000, end 4.000000
    Metadata:
      title           : Second chapter  should start at 2 sec
Output #0, mp4, to 'mov_bbb_with_chapters.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    encoder         : Lavf58.13.100
    Chapter #0:0: start 1.000000, end 2.000000
    Metadata:
      title           : First chapter
    Chapter #0:1: start 2.000000, end 4.000000
    Metadata:
      title           : Second chapter  should start at 2 sec
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 320x176, q=2-31, 300 kb/s, 25 fps, 25 tbr, 90k tbn, 90k tbc (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
      encoder         : JVT/AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
    Metadata:
      creation_time   : 2012-03-13T08:58:06.000000Z
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=  250 fps=0.0 q=-1.0 Lsize=     573kB time=00:00:10.00 bitrate= 469.0kbits/s speed= 635x    
video:367kB audio:197kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.671260%

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