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• WebVTT Audio Descriptions for Elephants Dream

  10 mars 2015, par silvia

  When I set out to improve accessibility on the Web and we started developing WebSRT – later to be renamed to WebVTT – I needed an example video to demonstrate captions / subtitles, audio descriptions, transcripts, navigation markers and sign language.

  I needed a freely available video with spoken text that either already had such data available or that I could create it for. Naturally I chose “Elephants Dream” by the Orange Open Movie Project , because it was created under the Creative Commons Attribution 2.5 license.

  As it turned out, the Blender Foundation had already created a collection of SRT files that would represent the English original as well as the translated languages. I was able to reuse them by merely adding a WEBVTT header.

  Then there was a need for a textual audio description. I read up on the plot online and finally wrote up a time-alignd audio description. I’m hereby making that file available under the Create Commons Attribution 4.0 license. I’ve added a few lines to the medadata headers so it doesn’t confuse players. Feel free to reuse at will – I know there are others out there that have a similar need to demonstrate accessibility features.

• HOW TO CHOOSE AUDIO WHILE CONVERTING .MKV TO .MP4 [duplicate]

  30 janvier 2021, par sanjai cyber

  I am trying to convert a .mkv file to .mp4 file, I used the command

  


  


  ffmpeg -i in.mkv -codec copy out.mp4

  


  


  I got the output but the thing is, the file i am converting has 4 different language for example - english,french,chinese,german. I get the output in English but i want the audio in french (The first audio plays while I open the file in vlc is english)

  


  Does anyone know how to choose the language ?

  


• Split Long Video Into Small Parts With FFmpeg And PHP

  13 janvier 2021, par Rhara Mutiara

  First, English is not my native language, I hope you understand what i want to say
  
I want to split long video, lets say 1 hour of video into small parts.
Right now I'm able to do this with this code
  

  


  ob_start();
    passthru('ffmpeg -i in.mp4 -acodec copy -f segment -segment_time 3 -force_key_frames "expr: gte(t, n_forced * 3)" %d.mp4');
    ob_end_clean();


  


  The output is thousands of parts with name 0.mp4, 1.mp4, 2.mp4 etc and 3sec duration each part
  
What I want to do now is should look like this :
  
0.mp4 3seconds , 1.mp4 5seconds, 2.mp4 3seconds.. etc
  
is it possible ?