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• Processing a video stream over websocket with opencv

  25 avril 2019, par Patrick Connors

  I’m trying to stream video over a websocket and process it server-side with Node.JS. The client is reading from a video file (.mp4) and sending it over the web socket via a stream object. However, I’m having trouble extracting frames from the stream at the server so it can be processed by opencv.

  Do I need to break the video up into frames and stream each individual frame ? What format can opencv most easily process in real time ?

  The end goal here is to enable opencv to process each frame of a video (in real time) that is being received by the server. Think I’m having some trouble understanding the paradigm here.

• live streaming with ffmpeg after processing video

  17 avril 2019, par Lotfus

  I have input videos that are received live then processed with ffmpeg then put in output to be live streamed. Where I am stuck is below.

  I am processing chunks of 10 seconds with ffmpeg in real time and I need to live stream these videos as I output them. I do not know how to proceed with ffmpeg, any clue ?

• Processing files and then re-uploading with fog and carrierwave fails on production

  2 mars 2015, par Laurie

  So I’m trying to get use carrierwave and fog to upload a file to my server, processing that file using ffmpeg to cut it into multiple small files, then upload those to s3.

  This works locally (no fog, just file storage), but breaks on production with this error :

  NoMethodError: undefined method 'to_file' for #CarrierWave::Storage::Fog::File:0x0000000639a458>

  And this trace :

  /var/deploy/webapp/web_head/shared/bundle/ruby/2.2.0/gems/carrierwave-0.10.0/lib/carrierwave/storage/fog.rb 259:in `store'
  
  …gems/carrierwave-0.10.0/lib/carrierwave/storage/fog.rb:  80:in `store!'
  
  …s/carrierwave-0.10.0/lib/carrierwave/uploader/store.rb:  59:in `block in store!'
  
  …rrierwave-0.10.0/lib/carrierwave/uploader/callbacks.rb:  17:in `with_callbacks'
  
  …s/carrierwave-0.10.0/lib/carrierwave/uploader/store.rb:  58:in `store!'
  
  …2.2.0/gems/carrierwave-0.10.0/lib/carrierwave/mount.rb: 375:in `store!'
  
  …2.2.0/gems/carrierwave-0.10.0/lib/carrierwave/mount.rb: 207:in `store_audio!'
  
  …/20150227144932/app/controllers/podcasts_controller.rb:  60:in `update'
  
  …2.0/gems/actionview-4.2.0/lib/action_view/rendering.rb:  30:in `process'
  
  …_language-2.0.5/lib/http_accept_language/middleware.rb:  14:in `call'
  
  …red/bundle/ruby/2.2.0/gems/rack-1.6.0/lib/rack/etag.rb:  24:in `call'
  
  …/ruby/2.2.0/gems/rack-1.6.0/lib/rack/conditionalget.rb:  38:in `call'
  
  …red/bundle/ruby/2.2.0/gems/rack-1.6.0/lib/rack/head.rb:  13:in `call'
  
  …/2.2.0/gems/rack-1.6.0/lib/rack/session/abstract/id.rb: 225:in `context'
  
  …/2.2.0/gems/rack-1.6.0/lib/rack/session/abstract/id.rb: 220:in `call'

  So, I have two uploaders. The uploader for the small chopped up audio files just sets the storage to fog, that’s it.

  After uploading the big audio file I run this processing function in the uploader (though the error doesn’t seem to come from here) :

  def split
  
    directory = File.dirname(current_path)
  
    tmpfile = File.join(directory,'tmpfile.mp3')
  
    File.rename(current_path,tmpfile)
  
    File.chmod(0644,tmpfile)
  
  
  
    sound = FFMPEG::Movie.new(tmpfile)
  
    @model.length = Mp3Info.open(tmpfile).length.round
  
  
  
  
  
    i=0
  
    number_of_lines= @model.ordered_lines.length
  
    lines = @model.ordered_lines
  
    while icode>

  Any ideas ?