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• Working example on live streaming using FFMPEG+MP4Box+Dash.js

  27 février 2017, par BartMao

  I’m stucked on this issue for a couple of days, couldn’t find a perfect working example.

  Here’s my current method :

  Step 1.

  ffmpeg -re -i sample.mp4 -threads 0 -y \
  
  -map 0:1 -vn -acodec aac -strict -2 -ar 48000 -ac 2 \
  
  -f segment -segment_time 4 -segment_format mpegts Dash\audio_%d.ts \
  
  -map 0:0 -vcodec libx264 -vprofile baseline -preset veryfast \
  
  -s 640x360 -vb 512k -bufsize 1024k -maxrate 512k -level 31 -keyint_min 25 -g 25 \
  
  -sc_threshold 0 -an -bsf h264_mp4toannexb -flags -global_header \
  
  -f segment -segment_time 4 -segment_format mpegts Dash\video_%d.ts

  Step 2.

  mp4box -add Dash\audio_%d.ts Output\audio_%d.ts.mp4
  
  mp4box -add Dash\video_%d.ts Output\video_%d.ts.mp4

  Step 3.

  mp4box -dash-ctx Output\dash-live.txt -dash 4000 \
  
  -rap -ast-offset 12 -no-frags-default -bs-switching no \
  
  -min-buffer 4000 -url-template -time-shift 1800 \
  
  -segment-name live_$RepresentationID$_ -out Output\live \
  
  -dynamic -mpd-refresh 2 -subsegs-per-sidx -1 Output\audio_%d.ts.mp4:id=audio Output\video_%d.ts.mp4:id=video

  I played the live.mpd generated using Dash.js, the player paused a long time before actually playing, and freeze every time getting a new m4s file.

  Are there any wrong on my commands ? Or it would be great if can provide any other good examples.

• PHP Ajax XMLHttpRequest popen live progress

  21 février 2016, par John R

  I’m trying to output live : the ffmpeg progress

  It works great when I execute the php file alone : many lines with text appearing one after an other...

  ••• But when it’s a XMLHttpRequest context, the output is 1 line empty

  PHP working when not in AJAX situation :

  ini_set("output_buffering", "0");
  
  ob_implicit_flush(true);
  
  $call_mp4 = ' __FFMPEG Command HERE__ ';
  
  $proc = popen($call_mp4, 'r');
  
  while (!feof($proc)) {
  
      echo '['.date("i:s")."] ".fread($proc, 4096).'<br />';ob_flush();flush();
  
  }

  Does someone know why in AJAX it’s blank and only 1 line ?
  how can this be fixed ?

  Regards

• Downloading earlier segments from a live m3u8 playlist

  25 juillet 2016, par Zafer Cesur

  I have an .m3u8 URI from an online live-stream. As far as I know, live playlists use a sliding window instead of containing all the segments. My questions are,

  ---

  1) Is it possible to find out what the length of the window is (time or frame-wise) ? My intention is to use the playlist I have to download a live-stream starting from an earlier time.

  2) If yes, how do I get the earlier segments, i.e., how do I specify where I want to start downloading from ? I tried something like ffmpeg -ss -00:00:10 -i "in.m3u8" out.mp4, but it did not work.

  I do not have much experience in video-encoding or live-streaming, and I would appreciate any direction ! The file that I am dealing with is printed below.

  ---

  #EXTM3U
  
  #EXT-X-TWITCH-INFO:NODE="video-edge-913b2c.jfk03",MANIFEST-NODE="video-edge-913b2c.jfk03",SERVER-TIME="1469462316.46",USER-IP="...",SERVING-ID="...",CLUSTER="jfk03",ABS="false",BROADCAST-ID="22500458080",STREAM-TIME="17374.4599299",MANIFEST-CLUSTER="jfk03"
  
  #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="chunked",NAME="Source",AUTOSELECT=YES,DEFAULT=YES
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=3566000,RESOLUTION=1920x1080,CODECS="avc1.4D402A,mp4a.40.2",VIDEO="chunked"
  
  http://video-edge-913b2c.jfk03.hls.ttvnw.net/hls-7e8a7c/imaqtpie_22500458080_490173831/chunked/index-live.m3u8?token=id=...,bid=...,exp=1469548716,node=video-edge-913b2c.jfk03,nname=video-edge-913b2c.jfk03,fmt=chunked&sig=...
  
  #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="high",NAME="High",AUTOSELECT=YES,DEFAULT=YES
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1760000,RESOLUTION=1280x720,CODECS="avc1.66.31,mp4a.40.2",VIDEO="high"
  
  http://video-edge-913b2c.jfk03.hls.ttvnw.net/hls-7e8a7c/imaqtpie_22500458080_490173831/high/index-live.m3u8?token=id=...,bid=...,exp=1469548716,node=video-edge-913b2c.jfk03,nname=video-edge-913b2c.jfk03,fmt=high&sig=...
  
  ...