Recherche avancée

Sur d’autres sites (8732)

• Unwarping 180 VR Footage with FFmpeg v360 Filter

  5 avril 2021, par Ted Wilmont

  I am struggling at present. I have searched high and low for days and can't find a command that achieves what we want to do.

  


  We have stereoscopic 180 degrees VR footage in a side-by-side equirectangular format that we want to convert to flat so we can process using further AI software.

  


  We have already split the file in half across the width using FFmpeg so we have a "right" eye and a "left" eye video file.

  


  For each video file, we need to convert the 180-degree equirectangular footage to a flat, unwarped video file using FFmpeg (and the v360 filter).

  


  We've tried the following for example :

  


  ffmpeg -i 2LEFT.mp4 -vf "v360=input=equirect:ih_fov=180:iv_fov=180:output=flat" 2LEFTTEST.mp4


  


  However, this results in a very warped/misaligned video.

  


  Some command examples, tips, suggestions as to convert the now monoscopic 180-degree equirectangular footage to a flat video file will be greatly appreciated.

  


  Thank you for your help in advance.

  


• Using FFMPEG in Java (developing on Mac)

  1er mai 2012, par Luuk D. Jansen

  I am trying to evoke FFMPEG directly in my Java code (running under the Playframework !).
  The final product will run on a Linux/Debian distro, but I first need to test on my Mac (I don't know if it works on Debian yet).

  I try to execute the simple code :

  Process pr = Runtime.getRuntime().exec(new String[]{"bash","-c", "ffmpeg"});

  or simpler :

  Process pr = Runtime.getRuntime().exec("ffmpeg")

  or using ProcessBuilder :

  Process pr = new ProcessBuilder("/opt/local/bin/ffmpeg").start();

  What I get is an error code 133, but I cannot find what this means.
  In the terminal the command gives the normal output. I can also replace 'ffmpeg' with e.g. 'ls -la' and get the directory listing. But I don't know what the problem is that ffmpeg does not work.

  Anybody any clues ?
  Thanks !

  UPDATE :
  I looked at the error stream. These are the errors I get. How is it that it works in the terminal, but not in using Java ?

  14:43:19,619 DEBUG ~ FFMPEG: dyld: Library not loaded: /opt/local/lib/libogg.0.dylib
  
  14:43:19,619 DEBUG ~ FFMPEG:   Referenced from: /opt/local/bin/ffmpeg
  
  14:43:19,619 DEBUG ~ FFMPEG:   Reason: Incompatible library version: ffmpeg requires version 9.0.0 or later, but libogg.0.dylib provides version 6.0.0

• Image processing in FFmpeg when playing a movie

  2 juillet 2016, par followait

  e.g. find car license plates and draw a bounding box for each plate
  Any easy way, or I’ve to do it myself ?
  Thanks.