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• MPEG-DASH create initialization segment

  3 novembre 2014, par static

  I’m segmenting the video capture of the desktop using ffmpeg -segment and sending them over network in order to be served to clients and to be played using dash.js. The problem is that the player is searching for the initialization segment and i don’t seem to be able to figure out how to create it.
  I create the segments using this ffmpeg command :

  ffmpeg -rtbufsize 1500M -f dshow -r 15 -i video="UScreenCapture"
  
  -flags +global_header -vcodec libvpx -crf 10 -quality good -keyint_min 15 -g 15
  
  -cpu-used 3 -b:v 1000k -qmin 10 -qmax 42  -threads 2 -vf scale=-1:480 -bufsize 1
  
  500 -map 0 -f stream_segment -segment_time 2 -segment_format webm http://localho
  
  st:3000/stream/22/%03d

  The manifest that i create for the stream looks something like this :

  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" type="dynamic" availabilitystarttime="2014-06-19T07:47:40.079Z" minbuffertime="PT0S" profiles="urn:mpeg:dash:profile:isoff-live:2011" suggestedpresentationdelay="PT40S" maxsegmentduration="PT2.000S" minimumupdateperiod="PT1000M">
  
  <period bitstreamswitching="true" start="PT0S">
  
  <adaptationset mimetype="video/webm" segmentalignment="true" startwithsap="1" maxwidth="1280" maxheight="720" maxframerate="15">
  
  <contentcomponent contenttype="video"></contentcomponent>
  
  <segmenttemplate presentationtimeoffset="0" timescale="90000" media="$Number$/" duration="180000" startnumber="0"></segmenttemplate>
  
  <representation width="853" height="480" framerate="15" bandwidth="1000000" codecs="vp8"></representation>
  
  </adaptationset>
  
  </period>
  
  </mpd> 

  The player debugging mode prints the following things :

  Getting the request for time: 0 dash.all.js:2073
  
  Index for time 0 is 0 dash.all.js:2073
  
  Waiting for more video buffer before starting playback. dash.all.js:2073
  
  BufferController video seek: 0 dash.all.js:2073
  
  Marking a special seek for initial video playback. dash.all.js:2073
  
  Start searching for initialization. dash.all.js:2073
  
  Perform init search: stream/22/ dash.all.js:2073
  
  Getting the request for time: 0 dash.all.js:2073
  
  Index for time 0 is 0 dash.all.js:2073
  
  Data changed - loading the video fragment for time: 0 dash.all.js:2073
  
  Getting the request for time: 0 

  How can i create the initialization segment for the generated segments ? I can’t seem to be able to get it to work.

• avcodec/me_cmp : restore author attribution and copyrights

  17 juillet 2014, par Michael Niedermayer

  avcodec/me_cmp : restore author attribution and copyrights
  These where removed by libav in
  See : git show -C 2d60444331fca1910510038dd3817bea885c2367
  
  diff —git a/libavcodec/dsputil.c b/libavcodec/me_cmp.c
  
  similarity index 98%
  
  rename from libavcodec/dsputil.c
  
  rename to libavcodec/me_cmp.c
  
  index ba71a99..9fcc937 100644
  
  — - a/libavcodec/dsputil.c
  
  +++ b/libavcodec/me_cmp.c
  
  @@ -1,8 +1,4 @@
  
   /*
  
   * DSP utils
  
   * Copyright (c) 2000, 2001 Fabrice Bellard
  
   * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  
   *
  
    * This file is part of Libav.
  
    *
  
    * Libav is free software ; you can redistribute it and/or
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/me_cmp.c

• libavformat : Remove a misleading/incorrect comment

  3 janvier 2015, par Martin Storsjö

  libavformat : Remove a misleading/incorrect comment
  This comment can be traced back to the initial commit from 2001,
  
  and it seemed to be misleading/incorect already back then. (It
  
  was used for normal, non-raw file formats already then.)
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/avformat.h