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• FFmpeg ignores scaling options

  6 janvier 2019, par SHM

  So far i have this command to generate thumbnails from input video :

  ffmpeg -ss 3 -i C:\\temp\\5.mp4 -vf "select=gt(scene\,0.4),scale=w=320:h=240:force_original_aspect_ratio=decrease" -frames:v 3 -vsync vfr -vf fps=fps=1/100 5%02d.jpg

  based on this question :

  https://superuser.com/questions/538112/meaningful-thumbnails-for-a-video-using-ffmpeg

  However output images are equal to input video dimensions (ffmpeg ignores passed scale config)

• cant convert webm to gif with node.js

  5 février 2015, par asafg

  I want to convert a .webm file to .gif

  I’m using the gifify module.

  var fs = require('fs');
  
  var gifify = require('gifify');
  
  var path = require('path');
  
  
  
  var input = path.join('./inputs', 'mov.webm');
  
  var output = path.join('./outputs', 'mov.gif');
  
  
  
  var gif = fs.createWriteStream(output);
  
  
  
  var options = {
  
    resize: '200:-1',
  
    from: 30,
  
    to: 35
  
  };
  
  
  
  gifify(input, options).pipe(gif);

  I keep getting this error

  events.js:53
  
  EventEmitter.prototype.emit = function emit(type) {
  
                                             ^
  
  RangeError: Maximum call stack size exceeded

  I think it has to do with the ffmpeg module dependency because when im trying to convert via shell I also get an error

  $ gifify inputs/mov.webm -o outputs/mov.gif --resize 800:-1
  
  [Error: Could not find ffmpeg on your system]

  Which is odd because i installed ffmpeg and I can require it.

  Does anyone know of to make gifify work ?
  Thank you !

• Call an external dynamic library using node

  25 septembre 2018, par Merc

  I need to edit clips using node using one of the existing video manipulation libraries. (Note : I am aware that I could run an existing editing executable like FFMPEG, but that’s not what I am after).

  Question : What’s the best way to call native libraries in Node ?

  Background information : I will need to talk to one one these libraries : Gstreamer, FFmpeg/LibAV or libVLC.

  My ideal outcome is to have a nice, robust library that I use directly using node, but my lack of experience in terms of using native libraries, and the somehow fragmented world of video editing libraries.