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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.

• MP4Box does not create final segment

  5 janvier 2019, par Dhruva

  MP4Box is not creating the final segment of video when I dash it. If I run this command on the command line I get only 15 segments out of 16(there is no error) and running it in Google’s Shaka player gives me a 404 at the end of the video saying that the 16th video segment is not found. I am running MP4Box version 0.5.2.

  MP4Box -dash 4000 -rap -frag-rap -sample-groups-traf -profile dashavc264:live -bs-switching multi -url-template video-700k-encrypted.mp4 video-1000k-encrypted.mp4 video-1500k-encrypted.mp4 video-2000k-encrypted.mp4 audio-encrypted.mp4 -out "dash_protected/manifest.mp4"

  .mpd file

  <?xml version="1.0"?>
  
  
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" minbuffertime="PT1.500S" type="static" mediapresentationduration="PT0H1M0.096S" maxsegmentduration="PT0H0M4.000S" profiles="urn:mpeg:dash:profile:isoff-live:2011,http://dashif.org/guidelines/dash264">
  
   <programinformation moreinformationurl="http://gpac.sourceforge.net">
  
    
  
   </programinformation>
  
  
  
   <period duration="PT0H1M0.096S">
  
    <adaptationset segmentalignment="true" bitstreamswitching="true" maxwidth="1024" maxheight="576" maxframerate="24" par="16:9" lang="eng">
  
     <segmenttemplate initialization="manifest_set1_init.mp4"></segmenttemplate>
  
     <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="852" height="480" framerate="24" sar="1:1" startwithsap="1" bandwidth="1477735">
  
      <segmenttemplate timescale="12288" media="source-video-1500k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="512" height="288" framerate="24" sar="1:1" startwithsap="1" bandwidth="689308">
  
      <segmenttemplate timescale="12288" media="source-video-700k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="1024" height="576" framerate="24" sar="1:1" startwithsap="1" bandwidth="1968345">
  
      <segmenttemplate timescale="12288" media="source-video-2000k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
     <representation mimetype="video/mp4" codecs="avc3.64002a" width="640" height="360" framerate="24" sar="1:1" startwithsap="1" bandwidth="994771">
  
      <segmenttemplate timescale="12288" media="source-video-1000k-encrypted_dash_track1_$Number$.m4s" startnumber="1" duration="49152"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" lang="eng">
  
     <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>
  
     <representation mimetype="audio/mp4" codecs="mp4a.40.2" audiosamplingrate="22050" startwithsap="1" bandwidth="69486">
  
      <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
  
      <segmenttemplate timescale="22050" media="source-audio-encrypted_dash$Number$.m4s" startnumber="1" duration="88045" initialization="source-audio-encrypted_dashinit.mp4"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
   </period>
  
  </mpd>

• PHP-FFMpeg Error while opening encoder for output stream

  5 janvier 2019, par Valor_

  I’m trying to use this PHP-FFMpeg library, but I’m keep getting errors like

  Error while opening encoder for output stream #0:0

  This is my PHP code

  private function createTeaserVideos($fullVideoPath, $databasePath, $uploadPath) {
  
          $ffmpeg = FFMpeg::create([
  
              'ffmpeg.binaries' => '/usr/bin/ffmpeg',
  
              'ffprobe.binaries' => '/usr/bin/ffprobe',
  
              'timeout'          => 0,
  
          ]);
  
  
  
          $ffmpeg->getFFMpegDriver()->listen(new \Alchemy\BinaryDriver\Listeners\DebugListener());
  
          $ffmpeg->getFFMpegDriver()->on('debug', function ($message) {
  
              var_dump($message);
  
          });
  
  
  
          // Create teaser_video_thumb
  
          $videoNameThumb = $this->randomTimeString() . '-thumb.mp4';
  
          $video = $ffmpeg->open($fullVideoPath);
  
          $video
  
              ->filters()
  
              ->resize(new \FFMpeg\Coordinate\Dimension(400, 280))
  
              ->synchronize();
  
          $video->save(new \FFMpeg\Format\Video\X264('aac', 'libx264'), $uploadPath . $videoNameThumb);
  
      }

  So what I’m trying to do here. User uploads his video and I’m trying to resize it and create one smaller video for the preview. The problem that I’m keep getting it is

  ffmpeg version 2.8.15-0ubuntu0.16.04.1' (length=46)
  
   Copyright (c) 2000-2018 the FFmpeg developers' (length=54)
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609' (length=72)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv' (length=1135)
  
    WARNING: library configuration mismatch' (length=49)
  
    avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc' (length=1413)
  
    libavutil      54. 31.100 / 54. 31.100' (length=48)
  
    libavcodec     56. 60.100 / 56. 60.100' (length=48)
  
    libavformat    56. 40.101 / 56. 40.101' (length=48)
  
    libavdevice    56.  4.100 / 56.  4.100' (length=48)
  
    libavfilter     5. 40.101 /  5. 40.101' (length=48)
  
    libavresample   2.  1.  0 /  2.  1.  0' (length=48)
  
    libswscale      3.  1.101 /  3.  1.101' (length=48)
  
    libswresample   1.  2.101 /  1.  2.101' (length=48)
  
    libpostproc    53.  3.100 / 53.  3.100' (length=48)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/vagrant/workspace/spot-scouting-adminpage/static/locations/MjY5MjI2Y2E0NDExOWNmZmQwN/teaser/f4095e9eeb364fe187bf1ed42eedc198.mp4':' (length=185)
  
    Metadata:' (length=19)
  
      major_brand     : mp42' (length=34)
  
      minor_version   : 0' (length=31)
  
      compatible_brands: mp42mp41' (length=39)
  
      creation_time   : 2019-01-04 12:46:43' (length=49)
  
    Duration: 00:00:08.41, start: 0.000000, bitrate: 10261 kb/s' (length=69)
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9982 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)' (length=153)
  
      Metadata:' (length=21)
  
        creation_time   : 2019-01-04 12:46:43' (length=51)
  
        handler_name    : Alias Data Handler' (length=50)
  
        encoder         : AVC Coding' (length=42)
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)' (length=109)
  
      Metadata:' (length=21)
  
        creation_time   : 2019-01-04 12:46:43' (length=51)
  
        handler_name    : Alias Data Handler' (length=50)
  
  -async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.100000:first_pts=0.' (length=107)
  
  [libx264 @ 0x136f620] height not divisible by 2 (400x225)' (length=65)
  
  Output #0, mp4, to '/home/vagrant/workspace/spot-scouting-adminpage/static/locations/MjY5MjI2Y2E0NDExOWNmZmQwN/teaser/gY0RfV9c0y06592770015466174550YfY9-thumb.mp4':' (length=172)
  
    Metadata:' (length=19)
  
      major_brand     : mp42' (length=34)
  
      minor_version   : 0' (length=31)
  
      compatible_brands: mp42mp41' (length=39)
  
      Stream #0:0(eng): Video: h264, none, q=2-31, 128 kb/s, 25 fps (default)' (length=83)
  
      Metadata:' (length=21)
  
        creation_time   : 2019-01-04 12:46:43' (length=51)
  
        handler_name    : Alias Data Handler' (length=50)
  
        start_time      : 0' (length=33)
  
        encoder         : Lavc56.60.100 libx264' (length=53)
  
      Stream #0:1(eng): Audio: aac, 0 channels, 128 kb/s (default)' (length=72)
  
      Metadata:' (length=21)
  
        creation_time   : 2019-01-04 12:46:43' (length=51)
  
        handler_name    : Alias Data Handler' (length=50)
  
        encoder         : Lavc56.60.100 aac' (length=49)
  
  Stream mapping:' (length=23)
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))' (length=63)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))' (length=60)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height' (length=127)
  
  ' (length=8)

  I can’t figure out what is the problem or how to solve it. Can someone please help me out ? I’m using Ubuntu 16 and I have installed ffmpeg via apt-get install ffmpeg.
  If you need any additional infomations, please let me know and I will provide. Thank you