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• Anomalie #4122 (Fermé) : mise à jour du modele vidéo

  1er avril 2018, par Franck D

  Hello :-)
  Juste pour dire que depuis spip 3.2, il y a dans le modele vidéo, l’appel d’un fichier qui n’est plus présent depuis la mise à jour de la lib
  https://zone.spip.org/trac/spip-zone/browser/_core_/plugins/medias/modeles/video.html#L17
  https://zone.spip.org/trac/spip-zone/browser/_core_/plugins/medias/modeles/video.html#L30
  https://zone.spip.org/trac/spip-zone/browser/_core_/plugins/medias/modeles/video.html#L31

  Nous appelons lib/mejs/flashmediaelement.swf mais ce fichier n’existe plus, pareil, il y a aussi
  https://zone.spip.org/trac/spip-zone/browser/_core_/plugins/medias/modeles/video.html#L46
  css/mejs-skin Je suis pas sûr que cela soit encore utile ?
  Franck

• Delay in video playback. Not able to identify the cause - AWS S3 region / ffmpeg / Videojs

  17 septembre 2016, par Himansu Kisan

  We are not able to identify the cause for random behavior while playing video on our website. (Sorry, cant share a link since the videos are for registered users only)
  The videos sometimes plays instantly and sometimes it takes over 1 minute to start. Not sure what we are doing wrong.

  We are using AWS S3 Oregon region (not the closest to target region, but it is cheaper) to store video files.
  The video files are encoded using ffmpeg. Below is the syntax

  ffmpeg -i input.mts -codec:v libx264 -threads 4 -movflags +faststart -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale="trunc(oh*a/2)*2:720" "output.mp4"

  ffmpeg -i input.mts -codec:v libvpx -threads 4 -quality good -cpu-used 5 -b:v 500k -maxrate 500k -bufsize 1000k -qmin 10 -qmax 42 -vf scale="trunc(oh*a/2)*2:720" -codec:a libvorbis -b:a 128k "output.webm"

  On website, we are using Videojs 5.10.8.
  Below is the code snippet

   <video class="video-js vjs-default-skin vjs-big-play-centered" preload="none" controls="controls" poster="abcd.jpg" style="width:100%;height:100%;min-height:360px;" data-setup="{&quot;autoplay&quot;:true}">
  
  <source src="abcd.mp4" type="video/mp4"></source>
  
  <source src="adcd.webm" type="video/webm"></source>
  
  <p class="vjs-no-js">
  
      To view this video please enable JavaScript, and consider upgrading to a web browser
  
      that <a href="http://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a>
  
  </p>
  
  </video>

  What are we doing wrong ? Please help us out.

• FFMPEG Dash with tiles of thumbnail images

  31 juillet 2020, par martyn Gilbert

  As of DASH-IF IOP version 4.2, section 6.2.6 defines the notion of image-based tracks in DASH :
https://dashif.org/docs/DASH-IF-IOP-v4.3.pdf.

  



  This is the ability to have an adaption set made up of mime type images that themselves are a strip of low resolution thumbnails. 
A player will use these thumbnails when the user hovers their mouse over the video timeline and get a 
preview of the the frame at that approximate timecode.

  



  Theo player website has a page dedicated to this function for playback :
https://www.theoplayer.com/blog/in-stream-thumbnail-support-dvr-dash-streams

  



  I need to generate a dash stream (not live) using ffmpeg that also contains these thumbnails. 
I already have an ffmpeg command that will generate the film strip of jpgs which outputs a thumbnail every 5 seconds of input video and joins 5 of these together in a single jpg :

  



  ffmpeg -i INPUT -q:v 20 -vf "select=not(mod(n\,125)),scale=480:270,tile=5x1" -vsync vfr output%d.jpg

  



  and the mpeg dash itself :

  



  ffmpeg -i INPUT -y -map 0 -acodec aac -ac 2 -ar 48000 -s 960x540 -vcodec libx264 -f dash -preset veryfast -b:v:2 1500k -seg_duration 2 output.mpd

  



  But I cannot find a way in ffmpeg to include the thumbnails in the dash mpd file.