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• Fluent-ffmpeg and complex filter in Electron (node)

  9 juillet 2016, par Matt Sergej Rinc

  I want to use fluent-ffmpeg module to call ffmpeg with complex filter from Electron but have no success. The error ’[AVFilterGraph @ 0xb8.......] No such filter " Error initalizing complex filters . Invalid argument’ is the same as in this question Error : Running FFmpeg command in Android ,splitting command in array not working but the context is different.

  What is needed ?
  Run this ffmpeg command using fluent-ffmpeg :

  ffmpeg -i safework-background-0.mp4 -i image1.png -i image2.png -i
  image3.png -filter_complex "[0:v][1:v]
  overlay=1:1:enable=’between(t,5,8.5)’ [tmp] ; [tmp][2:v]
  overlay=1:1:enable=’between(t,8.5,12)’ [tmp] ; [tmp][3:v]
  overlay=1:1:enable=’between(t,12,15)’" test-video-safework3.mp4

  It uses a complex filter to overlay three images on a video in sequence and exports a new video.

  What doesn’t work ?
  Obviously fluent-ffmpeg chokes with required quotes for complex filter, that is my conclusion (and is the same as for the Android variant question above).

  What works without fluent-ffmpeg in Electron ?
  As you can guess I have to resort to calling ffmpeg directly. To help others, the following command, with input and output video filenames parametrized, translates to Electron as :

    var spawn = require('child_process').spawn
  
    var fargs = ['-y', '-i', sourceDir.path() + '/' + inVideoName, '-i', tempDir.path() + '/' + 'image1.png',
  
    '-i', tempDir.path() + '/' + 'image2.png', '-i', tempDir.path() + '/' + 'image3.png',
  
    '-filter_complex', '[0:v][1:v]overlay=1:1:enable=\'between(t,5,8.5)\'[tmp];' +
  
    '[tmp][2:v]overlay=1:1:enable=\'between(t,8.5,12)\'[tmp];[tmp][3:v]' +
  
    'overlay=1:1:enable=\'between(t,12,15)\'', targetDir.path() + '/' + outVideoName]
  
    var ffmpeg = spawn(ffmpegc, fargs, { cwd:jetpack.cwd(app.getPath('home')).path() })
  
  // some code ommitted
  
    ffmpeg.on('close', (code) => {
  
      console.log(`child process exited with code ${code}`)
  
      webContents.send('notify-user-reply', 'Video processing done.')
  
    })

  The above command already has removed spaces between various filters (in complex filter) for each image or it would also choke.

  I would really love to use fluent-ffmpeg in Electron, not just for the convenience of calling ffmpeg more elegantly but also for some additional features like easy progress reporting.

• How to run the "ffmpeg -i input.mp4 output.avi" in Node.js ? [duplicate]

  3 septembre 2016, par Thales

  This question already has an answer here :

  • Execute a command line binary with Node.js
    
    6 answers
    

  I have a application on Electron that needs receive video and convert him another format, but I don’t know how to do. I’m thinking to do with node, but I need how to run the command "ffmpeg -i input.mp4 output.avi". I don’t know if this way is better. I thank first of all and I apologize for the ignorance.

• Streaming video with node

  14 septembre 2016, par Kei Taylor

  I am attempting to stream video with from my built-in Mac OSX webcam to a node server. My intent is to parse the video data I receive with ffmpeg once it reaches the server. This is my first time trying to manipulate video.

  My problem is, right now I am unable to use VLC to send data to a node server. I am opening a stream with VLC by using the "Open Network" option, and streaming through what I think is my local IP, port 3000. However, I am not sure how to get from that to opening the stream on a node file. Also, I am not able to open the stream on the same computer and view it (I mean, when I click open stream on VLC and plug in my local IP and port 3000, I can’t view the stream I’m sending out).

  Clearly, I am doing something wrong. As this is my first experience with VLC and video transmission, its possible I’m missing something important. Its my impression that I should be able to stream to an ip and port using VLC, and then set up a node server that listens for data from this same port and ip, recieves chunks of video data, and formats it using FFMPEG.

  My questions are :

  1) Is this understanding accurate ?
  2) Does anyone have guidance on how I would transmit with VLC and read with FFMPEG in node (and then send to another client ?)
  3) Failing that, any guidance on the simple question of how to transmit a video stream using VLC and then open it using VLC on the same computer ?
  4) Any resources explaining how to do this ?

  I’d really appreciate layman’s, baby explanations. I’ve found a few blog posts that have illuminated issues, but been a bit difficult to follow.

  Thanks, as always.