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• dashenc : copy language and role metadata from streams assigned to sets

  29 janvier 2017, par Peter Große

  dashenc: copy language and role metadata from streams assigned to sets
  
  Signed-off-by: Peter Große <pegro@friiks.de>
  Signed-off-by: Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/dashenc.c

• dashenc : default to one AdaptationSet per stream

  29 janvier 2017, par Peter Große

  dashenc: default to one AdaptationSet per stream
  
  Previously all mapped streams of a media type (video, audio) where assigned
  to a single AdaptationSet. Using the DASH live profile it is mandatory, that
  the segments of all representations are aligned, which is currently not
  enforced. This leads to problems when using video streams with different
  key frame intervals. So to play safe, default to one AdaptationSet per stream,
  unless overwritten by explicit assignment.
  
  To get the old assignment scheme, use
  
    -adaptation_sets "id=0,streams=v id=1,streams=a"
  
  Signed-off-by: Peter Große <pegro@friiks.de>
  Signed-off-by: Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/dashenc.c

• dashenc : allow assigning all streams of a media type to an AdaptationSet

  29 janvier 2017, par Peter Große

  dashenc: allow assigning all streams of a media type to an AdaptationSet
  
  Using the characters "v" or "a" instead of stream index numbers for assigning
  streams in the adaption_set option, all streams matching that given type will
  be added to the AdaptationSet.
  
  Signed-off-by: Peter Große <pegro@friiks.de>
  Signed-off-by: Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/dashenc.c

• dashenc : add support for assigning streams to AdaptationSets

  29 janvier 2017, par Peter Große

  dashenc: add support for assigning streams to AdaptationSets
  
  Also makes sure all streams are assigned to exactly one AdaptationSet.
  
  This patch is originally based partially on code by Vignesh Venkatasubramanian.
  
  Signed-off-by: Peter Große <pegro@friiks.de>
  Signed-off-by: Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/dashenc.c

• dashenc : separate segments based on current segment duration

  29 janvier 2017, par Peter Große

  dashenc: separate segments based on current segment duration
  
  The current implementation creates new segments comparing
  
    pkt->pts - first_pts > nb_segs * min_seg_duration
  
  This works fine, but if the keyframe interval is smaller than "min_seg_duration"
  segments shorter than the minimum segment duration are created.
  
  Example: keyint=50, min_seg_duration=3000000
   segment 1 contains keyframe 1 (duration=2s <  total_duration=3s)
                  and keyframe 2 (duration=4s >= total_duration=3s)
   segment 2 contains keyframe 3 (duration=6s >= total_duration=6s)
   segment 3 contains keyframe 4 (duration=8s <  total_duration=9s)
                  and keyframe 5 (duration=10s >= total_duration=9s)
   ...
  
  Segment 2 is only 2s long, shorter than min_seg_duration = 3s.
  
  To fix this, new segments are created based on the actual written duration.
  Otherwise the option name "min_seg_duration" is misleading.
  
  Signed-off-by: Peter Große <pegro@friiks.de>
  Signed-off-by: Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/dashenc.c