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• What is the correct path video using Streamio FFMPEG on Rails

  5 avril 2013, par Khalid

  I follow this gem https://github.com/streamio/streamio-ffmpeg , then I do this :

  movie = FFMPEG::Movie.new("#{Rails.root}/public/aaa.mov")

  but the result is :

  Errno::ENOENT: No such file or directory - ffmpeg -i /home/user/projects/test/public/aaa.mov

  Does anyone know ?

  Thanks

• Adding a watermark with FFMPEG via Rails

  16 juin 2016, par Felix

  in my Rails app I want to use ffmpeg to add a watermark to a movie while uploading.

  For that I’ve added the stremio-ffmpeg gem.

  My code looks like this :

  options = {watermark: Rails.root.join('public/images/logo_klein.png'), watermark_filter: {position: "RT", padding_x: 10, padding_y: 10}, custom: '-strict experimental'}
  
  
  
  tmp_path = File.join File.dirname(current_path), "tmp_file.mp4"
  
  file = FFMPEG::Movie.new(self.file.path)
  
  file.transcode(tmp_path, options)
  
  
  
  File.rename tmp_path, current_path

  But my Image is not added to the movie. wenn I call http://localhost/images/logo_klein.php it is shown in browser (image)

  What could be the problem for not added into the movie ? When I follow the console out transcoding is started properly. But nothing mentioned of watermarking only transcoding is mentiond

  console output :

   INFO -- : Running transcoding...
  
  ffmpeg -y -i /var/www/ji/public/uploads/tmp/1466030485-10470-0                                                              013-4987/2016-06-08_09.50.55.mp4   -strict experimental /var/www/ji/public/uploads/tmp/1466030485-10470-0013-4987/tmp_file.mp4

  What could be the problem ?

• rails / streamio-ffmpeg - How to execute 2-pass encoding ?

  20 mars 2017, par R4ttlesnake

  I’m using streamio-ffmpeg to encode videos uploaded to my Rails application via ffmpeg. I want to encode the videos to .webm-format using the VP9 coding format and the VP9 Encoding Guide of the WebM Project recommends using 2-pass encoding. I managed to get the videos encoding via streamio-ffmpeg using 1-pass encoding, but I can’t figure out how to handle the 2-pass encoding.

  Here my setup so far :

  # create two tempfiles for the video and a still
  
  video = Tempfile.new(["video", ".webm"], binmode: true)
  
  still = Tempfile.new(["still", ".jpg"], binmode: true)
  
  
  
  # new FFMPEG
  
  movie = FFMPEG::Movie.new(original.path)
  
  
  
  # extract still from video
  
  movie.screenshot(still.path)
  
  
  
  # encode video
  
  options = %w(-c:v libvpx-vp9 -b:v 1000K -threads 8 -speed 4 -tile-columns 6 -frame-parallel 1 -auto-alt-ref 1 -lag-in-frames 25 -c:a libvorbis -b:a 64k -f webm)
  
  movie.transcode(video.path, options)

  The command to do a 2-pass encoding with ffmpeg would be :

  ffmpeg -i <source> -c:v libvpx-vp9 -pass 1 ... -f webm /dev/null
  
  ffmpeg -i <source> -c:v libvpx-vp9 -pass 2 ... -f output.webm
  
  </source></source>

  In particular, I don’t get how to pass the file of the first encoding step to the second step with streamio-ffmpeg. How would I apply these two steps to the syntax of movie.transcode(output, options) ?

  Thanks !