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• Live WebRTC streams (getUserMedia) to DASH using WebM

  4 septembre 2015, par cyp

  I’m trying to understand the feasibility of a live streaming solution.
  I want to grab WebRTC streams (audio and video), send them to a server and transform them in chunks to send to a html5 video tag or a DASH player using WebM container (VP8 and Opus codecs).

  I also looked into ffmpeg, ffserver and gstreamer but...

  My question is how to feed the WebRTC streams (live) and transform them in HTTP chunks (live DASH compatible) ?

  Anyone achieved something like this ?

• 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.

• How to decode an MPEG Dash Widevine

  5 janvier 2016, par Martijn

  I have a video stream that I’d like to save to disk so I can play this back at a later time when I don’t have an internet connection at my disposal.

  The stream is a MPEG Dash Stream that uses Common Encryption, PlayReady, Widevine or Marlin.

  Is this possible in language like Go or NodeJS ?
  Could this be done using a command line utility like ffmpeg ?