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• SegmentedIndexBox (SIDX) not generated when using WEBM over DASH

  11 juillet 2014, par Flock Dawson

  I’m trying to get the Industry Format DASH player to work with WEBM audio/video files. However, I’m running in the same error again and again, and Google doesn’t seem to give much help.

  To start with, I created different streams of the same file (different resolutions and bitrates) using this tutorial : https://developer.mozilla.org/en-US/docs/Web/HTML/DASH_Adaptive_Streaming_for_HTML_5_Video

  Then, I downloaded the Industry Format DASH player (http://dashif.org/software/) and pointed it to the DASH manifest I created. When I try to play the video in Chrome, I get the following log :

  Parsing complete: ( xml2json: 3ms, objectiron: 2ms, total: 0.005s) dash.all.js:3
  
  Manifest has loaded. dash.all.js:3
  
  MediaSource is open! dash.all.js:3
  
  Event {clipboardData: undefined, path: NodeList[0], cancelBubble: false, returnValue: true, srcElement: MediaSource…}
  
  dash.all.js:3
  
  Video codec: video/webm;codecs="vp8" dash.all.js:3
  
  No text tracks. dash.all.js:3
  
  Audio codec: audio/webm;codecs="vorbis" dash.all.js:3
  
  Duration successfully set to: 27.2 dash.all.js:3
  
  Perform SIDX load: https://*****/street_orig_125k_final.webm dash.all.js:3
  
  Perform SIDX load: https://*****/street_audio_final.webm dash.all.js:3
  
  Uncaught RangeError: Offset is outside the bounds of the DataView 

  From this log, I distilled that the manifest is fetched and processed correctly, but something goes wrong when trying to process the SIDX (SegmetIndexBox). I tried another (third-party) source, which works perfectly. I analysed the response returned by the server when trying to fetch the SIDX, and when converted to a readable presentation, the text ’Dsidx’ can be found in this response. So, I analyzed the WEBM file I provide (hexdump and grep), but I cannot find such a SIDX. My conclusion is that the SIDX is never added to the WEBM file.

  From the tutorial I used, I guess the generation of the SIDX is handled by the samplemuxer command, which does not offer any additional parameters. Is there anyone who has more experience in generating this SIDX ?

• how to specify a seqence of image file to ffmpeg

  5 juillet 2014, par steveh

  i’m trying to encode a sequence of raw rgb image files in ffmpeg

  i have created a list of test files named lmfd001.rgb to lmfd299.rgb (300 total)

  i/m attempting to compress like this

  ffmpeg.exe -s 450x450 -pix_fmt rgb8 -c h264 -i lmfd%03d.rgb out.mp4

  it says

  lmfd%03d.rgb: No such file or directory

  i’m in a cygwin shell. i’m in the .rgb files directory.

  i also tried -i lmfd%03.rgb. i- lmfd001.rgb works but 1 file isn’t much use.

  i’ve googled around and that seems to be the right format. any ideas anyone ?

  i read this
  Warning : ffmpeg command line arguments are position sensitive – make sure you don’t mix up the order. Good rule of thumb to prevent mistakes is to keep the order of

  ffmpeg [input options] -i [input filename] -codec:v [video options] -codec:a [audio options] [output file options] [output filename]

  so i tried that too but didn ;t help

• Anomalie #4782 (Nouveau) : Révisions pour un admin restreint

  11 mai 2021, par jluc -

  En spip4.0alpha, sur l’accueil du privé, un admin restreint voit le nombre total des révisions sur le site et une liste vide suivi d’une abondante pagination inutile. Cf copie d’écran sur spip.net

  Et sur la page d’un article, un admin restreint n’a aucun aperçu des révisions. Il me semble qu’un admin restreint devrait avoir un plein accès aux révisions des articles de sa zone d’administration.