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• Media player get stuck in the middle of a buffered range on Chrome

  29 septembre 2019, par Feng Yu

  WHAT IS MY PROBLEM ?

  My website’s live streaming player use hls.js. From my server’s stat, there is many case where player get stuck in the middle of a buffered range.

  Here is my server raw stat log(removed some useless params) :

  tm=2019-09-27 12:04:41`bufferLevel=8.447303999999974`currentTime=158.4`buffered=[6.024,166.832]`readyState=4`ua=Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36 QBCore/3.53.1153.400 QQBrowser/9.0.2524.400 Tencent AppMarket/4.8 GameCenter

  currentTime is got by HTMLMediaElement.currentTime and buffered is got by HTMLMediaElement.buffered :

  currentTime=158.4
  
  buffered=[6.024,166.832]
  
  readyState=4

  From W3c :

  If HTMLMediaElement.buffered contains a TimeRange that includes the current playback position and enough data to ensure uninterrupted playback :

  1. Set the HTMLMediaElement.readyState attribute to HAVE_ENOUGH_DATA.
  2. Playback may resume at this point if it was previously suspended by a transition to HAVE_CURRENT_DATA.

  In this case, 613.3 is in the middle of [469.277,677.612], video should be progressing, but it is not.

  Hls.js will periodly check currentTime has progressed every 100ms. if currentTime has not progressed for 1000ms, then hls.js will trigger STALL event and I will send a stall stat to server.

  I cannot reproduce this problem on my side, it only appears on my server stat.

  WHAT I’VE TRIED

  shaka player has a module detect this case(https://www.ellealcatrase.eu/player2/docs/api/lib_media_stall_detector.js.html), Its comment shows that :

  Some platforms/browsers can get stuck in the middle of a
  buffered range (e.g. when seeking in a background tab). Detect when
  we get stuck so that the player can respond.

  but I cannot reproduce when my browser is in a background tab.

• Creating a Master Playlist after creating multiple renditions with FFMPEG for multi bitrate VOD

  15 septembre 2020, par Bill

  I am trying to upload a video to a server, convert the video file to 3 different videos with different resolutions (i.e. 1080p,720p, 480p), and then use FFMPEG to create a master playlist out of each of the resolutions all within the same command ? Is this possible ? So far I am able to upload a video and create 3 different resolutions but I haven't been able to use ffmpeg to create the master manifest. So far my FFMPEG command looks like this :

  



   ffmpeg -hide_banner -y -i beach.mkv \
  -vf scale=w=640:h=360:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod  -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -hls_segment_filename beach/360p_%03d.ts beach/360p.m3u8 \
  -vf scale=w=842:h=480:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod -b:v 1400k -maxrate 1498k -bufsize 2100k -b:a 128k -hls_segment_filename beach/480p_%03d.ts beach/480p.m3u8 \
  -vf scale=w=1280:h=720:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod -b:v 2800k -maxrate 2996k -bufsize 4200k -b:a 128k -hls_segment_filename beach/720p_%03d.ts beach/720p.m3u8 


  



  This command is based of research from this page https://docs.peer5.com/guides/production-ready-hls-vod/

  



  What do I need to add to the FFMPEG command to generate a master playlist ?

  


• How can I draw a image with relative position in Cairo

  14 juillet 2020, par Cat Tom

  I'm using Cairo to draw some elements in ffmpeg avframe. I want to draw a image relative to left and top with a rectangle outside, I found some examplecario doc, but they are all absolute coordinate. So my question is how can I draw image and rectangle in relative coordinate, if I can use some padding or margin API ?