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• 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 !

• Play same audio file to two different sound cards simultaneously using android media player [on hold]

  15 décembre 2016, par Hardik

  I have one custom board( media player) running android4.2 OS on it and I need to add a feature that will play same audio to two different sound cards simultaneously.

  I have two output devices HDMI and TLV320aic3100 Codec.
  And Want to play Video and audio through HDMI and same audio should play through TLV codec. Audio through TLV codec should be in sync with HDMI video/audio.

  Right now I’m able to play audio through TLV codec by hard-coding sound card number in tinyalsa PCM code "pcm.c" which is used by HAL code of Android Media Player (by default this code will give audio to HDMI),
  but not able to provide audio to both sound cards simultaneously.

  I tried with creating thread in pcm code and writing incoming audio data to both sound card, By doing this HDMI going into under-run problem.

  Is there any way to provide same audio to both sound cards simultaneously using Android Media Player or any other options to try ?