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• avformat/{isom,mov,movenc} : add support for CMAF DASH roles

  15 juillet 2021, par Jan Ekström

  avformat/isom,mov,movenc : add support for CMAF DASH roles
  This information is coded in a standard MP4 KindBox and utilizes the
  
  scheme and values as per the DASH role scheme defined in MPEG-DASH.
  
  Other schemes are technically allowed, but where multiple schemes
  
  define the same concepts, the DASH scheme should be utilized.
  Such flagging is additionally utilized by the DASH-IF CMAF ingest
  
  specification, enabling an encoder to inform the following component
  
  of the roles of the incoming media streams.
  A test is added for this functionality in a similar manner to the
  
  matroska test.
  Signed-off-by : Jan Ekström <jan.ekstrom@24i.com>
  

  • [DH] libavformat/isom.c
  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c
  • [DH] libavformat/movenc.c
  • [DH] libavformat/version.h
  • [DH] tests/fate/mov.mak
  • [DH] tests/ref/fate/mov-mp4-disposition-mpegts-remux

• init seg_duration option for dash similar to -hls_init_time option

  5 août 2019, par Saurabh

  Is there any option to set first segment duration for dash files, There is similar option for HLS : hls_init_time ?

  I could not found any such option in documentation.

  ---

  Why I want such option to be there :

  From generated DASH files : in Android ExoPlayer, It always plays first chunk of lowest quality(bitrate/resolution), after first chunk, basis user’s internet speed, it picks the next chunk. If there is no init_seg_duration option, I have to rely only on seg_duration and I can not keep it bit large. Why I will like to keep it large : to reduce the number of files generated.

  With such option, I could had given -init_seg_duraion 2 -seg_duration 6, so video quality would had increased after 2 seconds and total number of files generated would also not had exploded.

• Specifying track title or language in MPEG DASH MANIFEST

  10 février 2019, par Ramesh Navi

  I am creating a manifest to playback Adaptive WebM using DASH. Everything working pretty fine but I need language-name/track-name instead of bitrate. Is it supported ? How can update/optimize to support such feature ?

  Manifest creation :

  ffmpeg \
  
  -f webm_dash_manifest -i webm240.webm \
  
  -f webm_dash_manifest -i webm360.webm \
  
  -f webm_dash_manifest -i webm480.webm \
  
  -f webm_dash_manifest -i webm720.webm \
  
  -f webm_dash_manifest -i audio1.webm \
  
  -f webm_dash_manifest -i audio2.webm \
  
  -f webm_dash_manifest -i audio3.webm \
  
  -f webm_dash_manifest -i audio4.webm \
  
  -c copy -map 0 -map 1 -map 2 -map 3 -map 4 -map 5 -map 6  -map 7 \
  
  -f webm_dash_manifest \
  
  -adaptation_sets "id=0,streams=0,1,2,3 id=1,streams=4,5,6,7" \
  
  manifest.mpd

  Player audio track selection :