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• ffmpeg - Adding chapters to mp3 : How to create CTOC frame ?

  30 mai 2019, par yknivag

  Following this guide and this documentation I am trying to add chapters to an mp3 file using this command :

  ffmpeg -i input.mp3 -i ffmetadata.txt -map_metadata 1 -codec copy -id3v2_version 3 output.mp3

  The format of ffmetadata.txt is lifted straight from the ffmpeg.org site with a [CHAPTER] section for each chapter.

  ffmpeg adds the global metadata perfectly well, and creates CHAP frames for each chapter with corresponding TIT2 subframes with each chapter title. However no CTOC (table of contents) frame is created. Because no CTOC frame is created the iTunes podcast player doesn’t show the "next chapter" button.

  I have taken an mp3 with known working chapters and used the reverse ffmpeg command to extract the metadata to a file in ffmetadata syntax and there is no additional information in that file, no specific CTOC entries. Yet browsing the metadata from that file does reveal a correctly formatted CTOC frame present.

  Is there a specific flag I need to pass to ffmpeg to force it to build the CTOC frame ? Or do I have to include it in the ffmetadata file somehow ?

  If anyone has done this I’d be very grateful if you would share what works for you.

  PS Yes I know there are lots of GUI programs out there that can do this but I need to automate this so I need something that will run in a linux command line.

• Adding chapters to MP4 files, and being identified on iOS 12 podcast app

  5 avril 2019, par Craig Francis

  I have an MP4 file, where I’ve added chapters via ffmpeg.

  But in the iOS 12 Podcasts app, from Apple, the chapters don’t appear. This should happen, as noted by idownloadblog.com

  

  In comparison, when using QuickLook on MacOS, the list of chapters can be seen by clicking the chapters button (in the bottom right hand side of the window).

  

  And opening in QuickTime Player, while there isn’t a list of chapters to view, you can use the "View > Next Chapter" menu item.

  So I’m assuming this is a bug in iOS... but I’m wondering if there is another way to add chapters ? or if I’ve made a mistake ?

  ---

  My current process is to create a "ffmetadata" file, as noted in the ffmpeg documentation :

  ;FFMETADATA1
  
  title=Example
  
  
  
  [CHAPTER]
  
  TIMEBASE=1/1000
  
  START=0
  
  END=221913
  
  title=Chapter 1
  
  
  
  [CHAPTER]
  
  TIMEBASE=1/1000
  
  START=221913
  
  END=1169241
  
  title=Chapter 2

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

  Then I’ve tried each of the following commands :

  ffmpeg -i 2019-01-02.mp4 -i 2019-01-02.meta -map_metadata 1 -codec copy 2019-01-02-chapters.mp4
  
  ffmpeg -i 2019-01-02.mp4 -i 2019-01-02.meta -map_metadata 1 2019-01-02-chapters.mp4
  
  ffmpeg -i 2019-01-02.mp4 -i 2019-01-02.meta -map_metadata 1 2019-01-02-chapters.mp3

  • The first one is from the ffmpeg documentation, where -codec copy means the audio file is not re-encoded.
  • The second one takes longer, while it re-encodes the audio data.
  • The third one requires re-encoding to convert it into an MP3 file (which uses ID3 tags for the chapter data).

  ---

  On a slightly unrelated note, the third party app "RSSRadio" does list the chapters, but the feature added in version 4 that allows you to "skip directly to the start of the next chapter", if the next chapter starts within the next 3 minutes, does not seem to work.

• How to remove everything but video and stereo audio stream from video with ffmpeg ?

  20 octobre 2019, par user3776738

  I’m trying to get a clean h264 video from a mkv file.With clean I mean that it has only a video stream plus stereo sound.
  The inputfile can have multiple channels and subtitles and other unknown stuff, which I don’t need.
  I’m using ffmpeg with this command :

   ffmpeg -i "input.mkv" -ac 2 -vf scale=trunc(oh*a/2)*2:480 -c:v libx264 "output.mp4"

  This should give me a 480p video with stereo sound,which I require.
  I tried multiple -map or dispositions commands with ffmpeg to remove the subtitles whithout any success.

  How can I remove everything but video and stereo stream with ffmpeg and get a 480p stereo sound video ?

  Edit :
  Output of ffmpeg - "input.mkv" -i "output.mp4" :

  ffmpeg -i "input.mkv" -i "output.mp4"
  
  ffmpeg version N-91972-gbd10c1e9a8 Copyright (c) 2000-2018 the FFmpeg developer
  
  
  
    built with gcc 8.2.1 (GCC) 20180813
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconf
  
  g --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-li
  
  freetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-am
  
  wb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy -
  
  enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-
  
  ibwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 -
  
  enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --e
  
  able-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --e
  
  able-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --
  
  nable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --ena
  
  le-avisynth
  
    libavutil      56. 19.101 / 56. 19.101
  
    libavcodec     58. 30.100 / 58. 30.100
  
    libavformat    58. 18.101 / 58. 18.101
  
    libavdevice    58.  4.103 / 58.  4.103
  
    libavfilter     7. 32.100 /  7. 32.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  [hevc @ 00000000004a5940] Invalid default display window
  
  Input #0, matroska,webm, from 'input.mkv':
  
    Metadata:
  
      title           : Elysium (2013)
  
      encoder         : libebml v1.3.3 + libmatroska v1.4.4
  
      creation_time   : 2016-01-05T22:30:41.000000Z
  
    Duration: 00:01:02.73, start: 0.166000, bitrate: 53638 kb/s
  
      Chapter #0:0: start 0.000000, end 62.896000
  
      Metadata:
  
        title           : 00:00:00.000
  
      Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv), 3840x1606, SAR 1:
  
   DAR 1920:803, 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
  
      Metadata:
  
        title           : Elysium (2013) - Release for ULTRAHDCLUB
  
        BPS             : 51036975
  
        BPS-eng         : 51036975
  
        DURATION        : 00:01:02.604000000
  
        DURATION-eng    : 00:01:02.604000000
  
        NUMBER_OF_FRAMES: 1501
  
        NUMBER_OF_FRAMES-eng: 1501
  
        NUMBER_OF_BYTES : 399389852
  
        NUMBER_OF_BYTES-eng: 399389852
  
        _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_DATE_UTC: 2016-01-05 22:30:41
  
        _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-05 22:30:41
  
        _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
      Stream #0:1(eng): Audio: dts (DTS-HD MA), 48000 Hz, 7.1, s16p (default)
  
      Metadata:
  
        title           : DTS-HD MA 7.1 - Blu-ray CEE
  
        BPS             : 2706639
  
        BPS-eng         : 2706639
  
        DURATION        : 00:01:02.561000000
  
        DURATION-eng    : 00:01:02.561000000
  
        NUMBER_OF_FRAMES: 5865
  
        NUMBER_OF_FRAMES-eng: 5865
  
        NUMBER_OF_BYTES : 21166260
  
        NUMBER_OF_BYTES-eng: 21166260
  
        _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_DATE_UTC: 2016-01-05 22:30:41
  
        _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-05 22:30:41
  
        _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Elysium (2013)
  
      encoder         : Lavf58.18.101
  
    Duration: 00:01:02.73, start: 0.000000, bitrate: 1671 kb/s
  
      Chapter #1:0: start 0.000000, end 62.730000
  
      Metadata:
  
        title           : 00:00:00.000
  
      Stream #1:0(eng): Video: h264 (High 10) (avc1 / 0x31637661), yuv420p10le, 1
  
  46x480 [SAR 2030:2027 DAR 38773:16216], 1543 kb/s, SAR 15563:15540 DAR 1920:803
  
   23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fl
  
  p, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #1:2(eng): Data: bin_data (text / 0x74786574), 0 kb/s
  
      Metadata:
  
        handler_name    : SubtitleHandler
  
  At least one output file must be specified