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• Video upload with carrierwave-video on Rails 4

  15 juin 2017, par MJRLGUE

  it’s been a while I am fighting to play a video in my rails app.

  I am using carrierwave-video, OS : Windows 10 64bits, to stream/show a video in user posts.

  Here is what I did :

  the file video_uploader.rb :

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
    include CarrierWave::Video
  
    storage :file
  
    def store_dir
  
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
  end

  in the file : _post.html.erb :

  with this line of code : <%= video_tag post.video_url :controls =>true %> I get a blank box with the size of the video.
  and I tried this too and still doesn’t work : <%= video_tag post.video.url if post.video? %>

  I tried ffmpeg too, I installed ffmpeg in my pc and I did include : process encode_video: [:mp4, callbacks: { after_transcode: :set_success } ] in video_uploader.rb file and I get this form error message :

  Video Failed to transcode with FFmpeg. Check ffmpeg install and verify
  video is not corrupt or cut short. Original error : ArgumentError

  Any suggestions please ?

• ffmpeg4android : overlay a video on video with opacity

  21 juin 2016, par LuongTruong

  I am using ffmpeg4android to edit video. Now, I am able to overlay a video on a video by using this command :

  String[] complexCommand = {"ffmpeg","-y" ,"-i", "/sdcard/videokit/in_big.mp4","-strict","experimental", "-vf", "movie=/sdcard/videokit/in_small.mp4 [watermark]; [in][watermark] overlay=main_w-overlay_w-0:0 [out]","-s", "320x240","-r", "30", "-b", "15496k", "-vcodec", "mpeg4","-ab", "48000", "-ac", "2", "-ar", "22050", "/sdcard/videokit/out.mp4"};

  Now, I want to change the opacity of the video "in_small.mp4" which will be on the top of another video.

  Some useful links :
  using ffmpeg to add overlay with opacity
  ffmpeg overlay video with semi transparent video
  

  From those links, I know that all_opacity should be the keyword in this case, but I do not know where to put it in the command.

  Please let me know if you have any ideas. Any suggestion would be appreciated !

• Concat video output does not skip ahead or go backwards like normal video

  6 août 2020, par JOHN DADS

  i ran this basic concat code to combine an image and audio to output an mp4 video but the output video plays perfectly except for the fact that if I want to skip ahead in the video it goes back to the original position. This was run on python

  


  audio = ffmpeg.input("beat.mp3")

picture = ffmpeg.input("image.jpg")

ffmpeg.concat(picture, audio, v=1, a=1).output("video3.mp4").run()