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• How can I automatically embed commit information into a subtitles file that I'm tracking ?

  23 février 2015, par microspace

  I use git to track *.ass subtitle files.
  Here is example of *.ass file :

  [Script Info]
  
  ; Script generated by Aegisub 3.1.2
  
  ; http://www.aegisub.org/
  
  Title: Default Aegisub file
  
  ScriptType: v4.00+
  
  
  
  [V4+ Styles]
  
  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour,    BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
  
  Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1
  
  Style: titr,DejaVu     
  
  
  
  Sans,20,&H007DDBFA,&H000000FF,&H00000000,&HFF000000,0,0,0,0,100,100,0,0,1,2,2,1,10,10,10,1
  
  
  
  [Events]
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
  
  Dialogue: 0,0:00:00.46,0:00:11.22,Default,,0,0,0,,Если это можно было бы
  
  Dialogue: 0,0:00:03.44,0:00:08.96,titr,,0,0,0,,{\pos(20,240)\fad(600,600)}бывший министр

  After commit I burn subtitles into video :

  ffmpeg -i video.avi -vf "ass=subtitle.ass" out.avi

  My goal is to show commit date for 10 second at the start of movie. This should be done automatically.

  1) It can be easily done with by modifying subtitle.ass itself, but I can’t do it after commit and there are other reasons.

  2) It can be done by ffmpeg from command line : How to use ffmpeg to add a text to avi video ?

  Problem is that in this case text will be shown for the whole lenght of movie.

  3) I can copy *.ass file to temporary directory, insert date, render and delete *.ass file.

  Is there a simpler way ?

• Displaying javacv Frame class

  3 avril 2018, par shubham jaiswal

  I want to display a javacv Frame object directly into a gui container without converting into a buffered image or any of the jpeg/bmp as mentioned in https://docs.oracle.com/javase/8/javafx/api/javafx/scene/image/Image.html. Is there any way in which it can be achieved ?

  I want to do this as I have multiple video streams to be displayed.Currently the best performance that could be achieved is using JFrame and pixelwriter.It consumes around 8% CPU. I want to bring it to below 4% and so need a method to display the Frame object directly.

  If anyone could suggest an alternative GUI or language, it still helps.

  Regards & Thanks.

• How to encrypt webm file using Clear Key to play with Google's Shaka Player ?

  23 janvier 2017, par Nam Pham

  I’m developing a small system which will be used to streaming protected content over the web with MSE/EME API.

  This is some tools I’m using :

  • FFMPEG
  • Google’s Shaka-Packager
  • webm_crypt

  I can create .webm file and package them using shaka-packager into mpd file in order to feed to shaka-player. But following by the Clear Key section in the Shaka docs I have to encrypt webm file require pair of KeyId and Key.
  By using webm_crypt, I can created encrypted content by follow this document on 2.2.7 but I have no idea how to get the key pairs for the shaka-player DRM system.