Recherche avancée

Sur d’autres sites (5106)

• Insta360 RS One Inch damaged file correction from dual 360 to equirectangular not lining up perfectly [closed]

  25 juillet 2024, par Barry Houldsworth

  I replaced my old Theta Z1 with an Insta360 RS One Inch.

  


  The first time using it for an actual job, 6 of the 50 photos I took came back with damaged files. enter image description here

  


  The Insta360 support team have been completely useless.

  


  I have an image but it's sort of a dual fisheye thing.enter image description here

  


  I found ffmpeg and tried to use that to correct...and it's soooo close but not quite there.

  


  Here is the command I used to process the dual fisheye image to equirectangular

  


  ffmpeg -i input.jpg -vf v360=dfisheye:e:pitch=-180:roll=0:yaw=100:ih_fov=193:iv_fov=193 -qscale:v 1 -frames:v 1 output2.jpg

  


  It works great except there is a very noticeable seam where the two images join. It looks like one of the images needs to be nudged up just a bit before the conversion. But...I don't know how to do that.

  


  Note that this is for photos not video.

  


  Any help would be much appreciated.

  


  Thanks !

  


  I tried the command above and was hoping it would convert from a dual fisheye image to an equirectangular image.

  


  It does work but there is a noticable seam where the two images join.

  


  I have tried tweaking the fov values but that did not seem to help.

  


• Replace frames in an AVI with Java

  12 juillet 2018, par webuster

  I’m recording some screencasts and my crap recorder (Camtasia) recorded 2000 videos with a brief black flash (2-3 frames) at, or near the beginning of each.

  I’m looking for a way to automate the replacement of the black frames inside each video with FFmpeg, and I can currently detect which frames are black.

  The problem I have is now : How can I replace frame number X with the content of frame number X-1 in an AVI video ? Not looking to shorten the video, but just to replace a frame in-place.

  Here’s what I have so far :

  FFmpegFrameGrabber g = new FFmpegFrameGrabber("res/video.avi");
  
  g.start();
  
  
  
  FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(new FileOutputStream(new File("res/video_out.avi")), g.getImageWidth(), g.getImageHeight(), 2);
  
  
  
  recorder.setFormat("avi");
  
  recorder.setPixelFormat(AV_PIX_FMT_YUV420P);
  
  recorder.setFrameRate(30);
  
  recorder.setVideoCodec(AV_CODEC_ID_H264);
  
  recorder.setVideoQuality(10);
  
  recorder.setSampleFormat(AV_SAMPLE_FMT_FLTP);
  
  recorder.setSampleRate(48000);
  
  recorder.setAudioCodec(AV_CODEC_ID_AAC);
  
  recorder.setAudioQuality(10);
  
  
  
  g.setFrameNumber(1);
  
  recorder.setFrameNumber(2);
  
  recorder.record(g.grab());
  
  
  
  g.close();
  
  recorder.close();
  
  recorder.release();

  And I’m getting a video back with empty frames (not even black), so I might be messing something here.

  Anyone with experience with FFmpeg ?

• Is there a way to convert a VP9 webm video into CIELAB colourspace in FFMPEG to improve alpha compositing

  18 août 2022, par OneWorld

  I was wondering if there is an option / command to convert a webm VP9 video into CIELAB colour space in FFMPEG ?

  


  I did a search for CIELAB colour space in FFMPEG and couldn't find anything.

  


  I want to reduce the appearance of black edges by pushing into CIELAB space before doing the overlay / alpha compositing. See this post here :-

  


  moviepy black border around png when compositing into an MP4

  


  How can I do that in FFMPEG ?

  


  Any help would be much appreciated.

  


  Kind regards