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• How do unwrap fisheye and overlap fisheye lens with ffmpeg ? [closed]

  10 juillet 2023, par MrWm

  I am using an insta 360 x3 and would like to automate exporting videos without using their studio tools on Linux.

  


  Here's a screencap of a video format in the camera :

  


  Insta360 x3 camera screenshot

  


  ---

  


  I am using ffmpeg to unwrap the video feed with the following command : (taken from here)

  


  ffmpeg -y -i input.lrv -vf v360=dfisheye:e:yaw=-90 -c:v libx265 -b:v 40000k -bufsize 5000k -preset ultrafast -c:a copy -t 10 test.mkv


  


  The command works, and does a decent job, but one of the lens has a higher field of view with a fuzzy outline. This results in the following image :

  


  Image of Insta360 x3 camera screenshot after ffmpeg command

  


  ---

  


  Is there a way to change the ffmpeg command to either overlap both lenses by a couple pixels to remove the fuzz, or crop out the overlapping field of view ?

  


• Game Music Appreciation

  16 juillet 2012, par Multimedia Mike — Game Hacking

  A little over a year ago, I was prototyping a method to leverage Google Chrome’s Native Client technology in order to play old chiptunes (video game music) directly in a web browser. The last time I posted on the matter, I said that I might have something ready for public consumption by the time Google Chrome 21 rolled around. I thought I was being facetious but I wasn’t too far off. Chrome 20 is the current release version as I write this.

  Anyway, I did it : I created a chiptune music player in Native Client by leveraging existing C/C++ libraries such as Game Music Emu, Audio Overload SDK, and Vio2sf. Then I packaged up the player into into a Google Chrome extension and published it on the Chrome Web Store. Then I made a website cataloging as many chiptunes as I could find for 7 different systems :

  http://gamemusic.multimedia.cx/
  

  Check it out if you have any affinity for old game music or you want to hear how music was made using a limited range of bleeps and bloops. Thus far, the site catalogs NES, SNES, Game Boy, Nintendo DS, Genesis, Saturn, and Dreamcast songs. I’m hoping to add support and catalogs for many more systems, though, eventually bringing support in line with the Chipamp plugin for Winamp.

• creating thumbnail from a video using ffmpeg in php exec() returns 1 but returns 0 if command is 'ffmpeg -h'

  23 septembre 2013, par user2807517

  creating thumbnail from a video using ffmpeg in php exec() returns 1 but returns 0 if command is 'ffmpeg -h'. i am using ubuntu. A portion of my code is as shown bellow. When i tried $cmd it returned 1 and when i tried $cmd1 it worked.

  $ffmpeg = 'ffmpeg';
  
  $getFromSecond = 5;
  
  $videoFile = $_FILES['file']['tmp_name'];
  
  $size = '105x73';
  
  $imageFile = 'Newimage.jpg';
  
  
  
  $cmd = "$ffmpeg -an -ss $getFromSecond -i $videoFile -vframes 1 -s $size $imageFile";
  
  $cmd1 = "$ffmpeg -h";

  works for $cmd1 but not for $cmd, i am thinking it is permission issues