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• MPEG-DASH and fragmented mp4

  15 septembre 2015, par bhh1988

  My understanding of fragmented mp4 is that it is a single file, but internally it is structured as fragments. Can someone explain to me how these fragments can be addressed in the .mpd file for DASH ? The .mpd files that I’ve seen seem to address various segments with separate urls, but a fragmented mp4, I imagine, would have to be addressed by byte offsets into the same url. How does the browser then know what times correspond to what byte ranges ?

• How to create mpeg-dash mpd file with multiple periods ?

  14 septembre 2022, par Nimish Agrawal

  I wanted to join multiple mp4 files to create a mpd file. I wanted to have each of the individual mp4 files to be in different periods.

  


  I tried to do that using ffmpeg

  


  ffmpeg -i INPUT_FILE1.mp4 INPUT_FILE2.mp4 ...options... -f dash output.mpd


  


  But it is only considering first mpd file. Is it possible to do this using ffmpeg or any other tool ?

  


  ffmpeg -y -re -i big_buck_bunny_720p_1mb.mp4  -c:v libx264 -x264opts "keyint=24:min-keyint=24:no-scenecut" -r 24  -c:a aac -b:a 128k  -bf 1 -b_strategy 0 -sc_threshold 0 -pix_fmt yuv420p  -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0  -b:v:0 250k  -filter:v:0 "scale=-2:240" -profile:v:0 baseline  -b:v:1 750k  -filter:v:1 "scale=-2:480" -profile:v:1 main  -b:v:2 1500k -filter:v:2 "scale=-2:720" -profile:v:2 high  -use_timeline 1 -use_template 1 -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a"  -f dash movie-dash\movie.mpd


  


• fate : update reference files after the recent dash manifest muxer changes

  8 avril 2022, par James Almer

  fate : update reference files after the recent dash manifest muxer changes
  Missed in 487b49d8f2e1e81dce86230fc957ca2ee9de00ee.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] tests/ref/fate/webm-dash-manifest
  • [DH] tests/ref/fate/webm-dash-manifest-representations
  • [DH] tests/ref/fate/webm-dash-manifest-unaligned-audio-streams
  • [DH] tests/ref/fate/webm-dash-manifest-unaligned-video-streams