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• How can I call m3u8 with multiple audio

  26 février 2020, par desmeit

  I have the following playlist.m3u8 with multiple audio :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  
  
  #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",LANGUAGE="fr",NAME="France",AUTOSELECT=NO,URI="fr/test.m3u8"
  
   #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",LANGUAGE="en",NAME="English",AUTOSELECT=NO,URI="en/test.m3u8"
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=800000,RESOLUTION=360x640,AUDIO="audio"
  
  640p.m3u8
  
  #EXT-X-STREAM-INF:BANDWIDTH=1400000,RESOLUTION=480x842,AUDIO="audio"
  
  842p.m3u8
  
  #EXT-X-STREAM-INF:BANDWIDTH=2800000,RESOLUTION=720x1280,AUDIO="audio"
  
  1280p.m3u8
  
  #EXT-X-STREAM-INF:BANDWIDTH=5000000,RESOLUTION=1080x1920,AUDIO="audio"
  
  1920p.m3u8

  if I only call the URL http://XXX.playlist.m3u8, the french audio file is played automatically. I know that the selection of the language in the native player at Apple is displayed like this :

  

  Is there an additional possibility to select the language for example by parameters ?

  http://XXX.playlist.m3u8?LANGUAGE=DE for example

  And is it possible to run two audio files in parallel ?

• FFMPEG : Encoding WEBM with fast-seek and copyts leads to wrong video length

  13 mars 2020, par TheOverlord2D

  I’m trying to convert a scene from a soft-subbed MKV file into a hard-subbed WEBM file with two-pass. The video encodes fine, but the file shows the wrong length when opened on a media player (it’s showing as if I had encoded the original file from the starting point all the way to the end).

  This is the command I’m using :

  set timestamp=-ss 12:59.069 -to 16:14.277
  
  
  
  ffmpeg -y %timestamp% -copyts -i source.mkv -shortest -c:v libvpx-vp9 -pass 1 -b:v 0 -crf 33 -threads 8 -speed 4 -tile-columns 6 -frame-parallel 1 -an -sn -vf scale=-1:720,subtitles=source.mkv -f webm NUL
  
  ffmpeg -y %timestamp% -copyts -i source.mkv -shortest -c:v libvpx-vp9 -pass 2 -b:v 0 -crf 33 -threads 8 -speed 2 -tile-columns 6 -frame-parallel 1 -auto-alt-ref 1 -lag-in-frames 25 -c:a libopus -b:a 64k -sn -vf scale=-1:720,subtitles=source.mkv -f webm out.webm

  When opening the video in MPC-BE, the video plays regularly until around the point shown on https://i.stack.imgur.com/6bRwc.png (which is where the scene I wanted to cut out ends) then it just skips to the end of the file, and this wrong length is giving me all sorts of issues when I try to use the encoded video.

• FFMPEG || NGINX RTMP server not naming MPEG DASH chunks

  12 avril 2020, par Mathew Knight

  Feel like i'm smashing my head against a brick wall here, i've been tryin to figure thisout for so long....

  



  Basically i'm trying to send an RTMP stream to my NGINX server running on Ubuntu 18.04, then transcode it to a custom MPEG DASH stream that muxes the stream into 2 streams for audio and video.

  



  as i need to have the chunks in the same destination folder i need to rename them.

  



  when i try the following FFMPEG script it just keeps giving me chunks named for example :

  



  chunk-stream-audio-%05d.webm

  



  the %05d should be the chunk number running consecutively.

  



  Running a similar script on my Macbook the chunks generate correctly... is this an error of have i done something wrong here ?

  



  Here's my FFMPEG script

  



  exec_push ffmpeg -re -an -i 'rtmp://localhost:1935/live/stream' -map 0:v:0 -c:v libvpx-vp9 -s 1920x1080 -bufsize 15000k -b:v 15000k -keyint_min 150 -g 150 -tile-columns 4 -frame-parallel 1 -an -f dash -init_seg_name 'init-stream$RepresentationID$_video.webm' -chunk_start_index 1 -media_seg_name 'chunk-stream$RepresentationID$-video-$Number$.webm' '/home/mathewknight/Desktop/test/video.mpd' -map 0:a:0 -c:a libopus -mapping_family 255 -b:a 1024k -vn -f dash -init_seg_name 'init-stream$RepresentationID$_audio.webm' -chunk_start_index 1 -media_seg_name 'chunk-stream$RepresentationID$-audio-$Number%05d$.webm' '/home/mathewknight/Desktop/test/audio.mpd'  2>>/var/log/nginx/ffmpeg.log;