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• Issues executing ffmpeg on windows

  4 avril 2017, par Somename

  Installed ffmpeg. Added the PATH in system Environment Variables and can execute ffmpeg from anywhere in the cmd. Installed fluent-ffmpeg. Below is my script :

  var express = require('express');
  
  var bodyParser = require('body-parser');
  
  var app = express();
  
  var ffmpeg = require('fluent-ffmpeg');  
  
  
  
  var proc = new ffmpeg({ source: 'myfile.gif' })
  
    .withAspect('4:3')
  
    .withSize('640x480')
  
    .applyAutopadding(true, 'white')
  
    .saveToFile('myfile.avi', function(stdout, stderr) {
  
      console.log('file has been converted succesfully');
  
    });
  
  
  
  app.listen(3000, function() {  
  
      console.log("Server Running on 3000");
  
  });

  Getting error :
  

  

  Please help.

• matplotlib ArtistAnimation returns a blank video

  28 mars 2017, par Mpaull

  I’m trying to produce an animation of a networkx graph changing over time. I’m using the networkx_draw utilities to create matplotlib figures of the graph, and matplotlib’s ArtistAnimation module to create an animation from the artists networkx produces. I’ve made a minimum reproduction of what I’m doing here :

  import numpy as np
  
  import networkx as nx
  
  import matplotlib.animation as animation
  
  import matplotlib.pyplot as plt
  
  
  
  # Instantiate the graph model
  
  G = nx.Graph()
  
  G.add_edge(1, 2)
  
  
  
  # Keep track of highest node ID
  
  G.maxNode = 2
  
  
  
  fig = plt.figure()
  
  nx.draw(G)
  
  ims = []
  
  
  
  for timeStep in xrange(10):
  
  
  
      G.add_edge(G.maxNode,G.maxNode+1)
  
      G.maxNode += 1
  
  
  
      pos = nx.drawing.spring_layout(G)
  
      nodes = nx.drawing.draw_networkx_nodes(G, pos)
  
      lines = nx.drawing.draw_networkx_edges(G, pos)
  
  
  
      ims.append((nodes,lines,))
  
      plt.pause(.2)
  
      plt.cla()
  
  
  
  im_ani = animation.ArtistAnimation(fig, ims, interval=200,            repeat_delay=3000,blit=True)
  
  im_ani.save('im.mp4', metadata={'artist':'Guido'})

  The process works fine while displaying the figures live, it produces exactly the animation I want. And it even produces a looping animation in a figure at the end of the script, again what I want, which would suggest that the animation process worked. However when I open the "im.mp4" file saved to disk, it is a blank white image which runs for the expected period of time, never showing any of the graph images which were showed live.

  I’m using networkx version 1.11, and matplotlib version 2.0. I’m using ffmpeg for the animation, and am running on a Mac, OSX 10.12.3.

  What am I doing incorrectly ?

• shell - looping command with several variables

  19 janvier 2017, par o_ren

  I’m running an FFmpeg command from a script which takes several arguments and passes them to the command.
  

  #!/bin/bash
  
  
  
  while getopts "i:b:" flag
  
  do
  
    case "$flag" in
  
      i) input="$OPTARG";;
  
      b) IFS=, read -a bitrate <<< "$OPTARG";;
  
    esac
  
  done
  
  
  
  for rate in "${bitrate[@]}";
  
    do
  
      ffmpeg -i $input -video_size 100x100 -b:v $bitrate -y output.mp4
  
    done
  
  
  
  exit

  I use getopts to take the variables and for loop to run the command.
  To run the script I use script.sh -i input.mov -b 1000,2000,3000 and FFmpeg runs 3 times, each with different $bitrate value.

  What if I want to pass another var - scale, to the command and run it like this :
  script.sh -b 1000,2000,3000 -s 100x100,200x200,300x300 so the first run would use -b 1000 and -s 100x100, second run use -b 2000 and -s 200x200 and so on.
  Is this posooble ? I would like to keep using getopts if possible.