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• FFmpeg video to still images and back to video lossless

  28 novembre 2012, par Rigoni

  I'm trying to extract an image from an uncompressed AVI video using FFmpeg with the command :

  ffmpeg -i sorce.avi -f image2 -pix_fmt bgr24 images/%1d.bmp

  All is okay, but now I need to convert these images back to a video file.
  I'm trying using this command :

  ffmpeg -f image2 -r 24 -i marked/%1d.bmp -y -vcodec ffv1 -pix_fmt bgr24 test.avi

  But the output video is compressed and poor quality.

  Is there any way to extract the images in RGB format and than back to a lossless video ?

  I also tryed to use -vcodec rawvideo, but the quality still bad.

• Ruby Video Upload - Cocaine error when trying to transcode video

  21 janvier 2015, par Scottagecheeze

  I am having a bit of trouble when it comes to transcoding a video being uploaded by Paperclip to S3. I have tried both gem 'paperclip-ffmpeg' and gem 'paperclip-av-transcoder. Both fail when I try to add a new style :

  :styles => {
  
      :medium => { :geometry => "640x480", :format => 'flv' }
  
    }, 
  
    :s3_credentials => {:bucket => ENV['S3_BUCKET_NAME'], :access_key_id => ENV['ACCESS_KEY_ID'], :secret_access_key => ENV['SECRET_ACCESS_KEY']},
  
    :processors => [:ffmpeg],
  
    :path => ":id/:style/:style_:basename.:extension"

  I am able to upload my video as is but I am not able to transcode them. Here is the error that it gives me, sorry for the link, I am not able to post images yet.

  Essentially I want to be able to upload a video in any format and transcode it into a specific format. Any help is greatly appreciated.

  Thanks

• Creating image overlay on video like tiktok on a video in flutter [closed]

  12 octobre 2020, par Sarthak Singhal

  I am trying to create an app in flutter in which user can add image on a video like the given screenshot. The user should be able to move the image widget anywhere on the screen, resize it, and rotate it also. When this is done, the image should be merged on the video.

  


  For now I have used Stack and MatrixGestureDetector to let the user move the images on the screen.

  


  I want to know how to merge this image along with the exact scale, rotation and position as seen on the screen.

  


  Also if I am going in wrong direction then please guide me the right way to do image overlay on a video in flutter like that of tiktok or snapchat.