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• libdash mpd parser integration with custom player

  19 novembre 2016, par Raj

  I have written a multimedia player using ffmpeg and qt-framework. And currently I support local file playback and progressive download playback in my player. Now I want to add support for mpeg-dash vod stream playback. I thought of using libdash opensource dash library. But after so much of googling I couldn’t find any API or developer documentation regarding the same.

  Also another issue is libdash has integrated network module. But I want only mpd parser to be integrated and I have my own network module for downloading. I couln’t find any doxygen and usage documentation for libdash.

  I need help in these :

  1. Can you anyone point me to any developer documentation available for
     libdash ?
  2. Is there any alternative library for libdash ?

• How to not add AdaptationSet for audio in cmd file if audio stream is not present in input video file

  15 juin 2019, par Saurabh

  I am using ffmpeg-dash to create mpd files. I am using following command to generate the same :

  ffmpeg -i input/video.mov \
  
          -map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:a\?:0 \
  
          -b:v:0 350k -c:v:0 libx264 -filter:v:0 "scale=320:-1" \
  
          -b:v:1 1000k -c:v:1 libx264 -filter:v:1 "scale=640:-1" \
  
          -b:v:2 3000k -c:v:2 libx264 -filter:v:2 "scale=1280:-1" \
  
          -use_timeline 1 -use_template 1 -window_size 6  -adaptation_sets "id=0,streams=v id=1,streams=a"  \
  
          -seg_duration 2 -threads 16 -hls_playlist true -f dash output/ffmpeg/output.mpd

  This works with video which has audio streams, but for the case there is no audio stream in the video file, I get empty entry for audio in mpd files like following, which is not valid and fails while playing in Exo Player in Android.

  <adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true">
  
  </adaptationset>

  I tried adding ? in option adaptation_sets like : id=0,streams=v id=1,streams=a?, however that also adds above line.

  One solution is to run different commands for different videos by first checking whether there is audio stream or not, but would be better if there is some option which add audio adaptationSet only if audio stream is present in the input file.

• avformat/mov : Enable stream parsing for VP9.

  7 septembre 2016, par Matthew Gregan

  avformat/mov : Enable stream parsing for VP9.
  MP4 media containing VP9 using superframes (such as
  
  https://github.com/Netflix/vp9-dash/raw/master/DASH-Samples/Fountain_2997_0560kbps_640x480_4x3PAR.ivf_DashUnencrypted.ismv)
  
  does not decode correctly with the built-in VP9 decoder because
  
  superframes are passed to the decoder whole rather than split into
  
  individual frames.
  Signed-off-by : Matthew Gregan <kinetik@flim.org>
  

  • [DH] libavformat/mov.c