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• Reading and changing the pixel value of mp4 frames in java

  24 mars 2019, par David

  I am attempting to create a steganographic program to hide data in videos. I intend to do this by changing the least significant bits of pixels in all or at least several frames.

  The thing I’m getting stuck on is how to actually insert the data into the video. The data in every frame will be an encryption of the actual data I want to hide alongside the timestamp of the frame. The reason i include the timestamp is so that every one of them is different which makes it more difficult to detect. I have previously used FFMPEG to extract images from videos and then working with the images, so a solution using FFMPEG would be ideal but I am open to using whatever works.

  So Is there any way to do this in Java ?
  Time efficiency isn’t super important but it would obviously take forever to create a new copy of the video for every frame that is changed.

• How to call ffmpeg with Java - umlauts ?

  15 juillet 2014, par Mese

  I am using the Java ProcessBuilder to call FFmpeg to capture a single window on my screen on Windows 7 using this command :

  ProcessBuilder pb = new ProcessBuilder(
  
    "path\\ffmpeg",
  
    "-f", "gdigrab",
  
    "-i", "title=" + "title of window",
  
    "path\\out.mp4"
  
  );

  With most windows this works fine and I don’t have any problems. But when I try to capture a window with an umlaut (like ÄÖÜ) in its title, I get an error that FFmpeg could not find that window. The same happens when starting FFmpeg using the Windows console.

  Does FFmpeg have a problem using umlauts and is there a way to capture windows with umlauts ?

  Thanks !

• Java - handing file deletion

  2 janvier 2016, par QQMusic

  So I am using the youtube-dl command line program within Java with simple command line execute function and coupling it with ffmpeg to convert to mp3. Now the thing I am having trouble with it the fact that after I get the .mp4 file from youtube-dl, when I convert it into a .mp3, it will create a completely separate file.

  So the way it is now :

  1. Get `.mp4`
  
  2. Get `.mp3`
  
  3. delete `.mp4'

  The issue I am facing now is that if the user was to stop the program while it was between step 1 and step 2, then they would be left with the .mp4 file which is not wanted. So is there a way to delete certain files once the user exits the process, whether it being from safely ending the program (this one should be easy), ending the process, or closing the computer ?