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• 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

• Matomo’s new story : our stronger vision for the future

  31 octobre 2018, par Matthieu Aubry — Community

  

  Over the past year, the team here at Matomo have been working on a very exciting project we’d love to share with you.

  It’s to do with the impact we hope for Matomo to have.

  As you all know, the world changes at too fast a pace. New technologies, new phones, new everything in the blink of an eye. That’s not what will be happening here.

  Instead, we’d like to believe it’s a refresh. Taking stock of how far we’ve come, what we’ve achieved so far, and how far we still have to go.

  So we’re rebranding.

  The rebrand

  Like a caterpillar emerging from a cocoon, we hope to be a reborn analytics butterfly.

  As a result of some careful planning and reflection we’ll be updating our logo, website and reasserting our voice.

  It’s our chance to look at ourselves in a new light. We are a mighty analytics platform and it should be known we’re comparable to the likes of Google Analytics 360.

  Along with the refresh of imagery, we listened to your feedback about the confusion between our two identities, so we’re also taking this opportunity to unite both the business brand of Innocraft with the community brand Matomo into one website.

  It makes it easier for people from all walks of life, either as individuals or in large companies, to see us as being able to get down to business with a powerful analytics tool, as well as think on behalf of our community.

  We’re the same, but with slight changes in our appearance and a stronger vision for the future.

  How far we’ve come …

  When we started out, it was about building a community around a movement. From the beginning we were concerned about data ownership, privacy and all things that came with that.

  With the help of our community and contributors, we turned Matomo (formerly Piwik) into the trusted #1 open source analytics tool it is today. We’re committed to our community. But we also need to do more.

  We’ve been niche and happy staying small, but now we need to take action and start shouting far and wide about what we do.

  We once said we need : “To create, as a community, the leading international open source digital analytics platform, that gives every user full control of their data.”

  We believe we’ve done that, so we’ll take it one step further.

  A web analytics revolution has begun …

  Begun ?

  The line signifies a new beginning.

  This is us standing up and reasserting our voice.

  Our new chapter.

  The rebrand is our chance to show that, yes, the world is changing, but when it comes to privacy, there are matters meant to be sacred. Privacy is a human right.

  What makes it worse in this ever-changing landscape, with data breaches and stolen information, is that losing control of our data is scary, we have a right to know what’s going on with our information and this must start with us.

  We know we need to champion this cause for privacy and data ownership.

  We came together as a community and built something powerful, a free open-source analytics platform, that kept the integrity of the people using it.

  It’s important for us now to feel more empowered to believe in our right to privacy, information and our ability to act independently of large corporations.

  The time is here for us to speak up and take back control.

  Once more, we need to come together to build something even more powerful, a safer online society.

  Join us.

  Sincerely,
  Matthieu Aubry on behalf of the Matomo team