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• How to create a circular countdown indicator overlayed into a video with ffmpeg ?

  18 novembre 2020, par Ben Holness

  I have a script that creates a video from multiple sources. At the start of the video there is a 5 second long pause where some information is displayed.

  


  I want to give a visual indicator of how long it is until the main video starts, with a circle in the top left corner. The circle would start completely transparent and slowly fill in grey round the circle as the video progresses. At 25% of the video, the top right quarter of the circle would be gray. At 50% the right half of the circle would be gray and so on.

  


  I am imagining something similar to this solution which is a progress bar, but I'm not sure if it's possible/how to make it a circular one.

  


• Can I create a circular countdown indicator overlayed into a video with ffmpeg ?

  9 novembre 2020, par Ben Holness

  I have a script that creates a video from multiple sources. At the start of the video there is a 5 second long pause where some information is displayed.

  


  I want to give a visual indicator of how long it is until the main video starts, with a circle in the top left corner. The circle would start completely transparent and slowly fill in grey round the circle as the video progresses. At 25% of the video, the top right quarter of the circle would be gray. At 50% the right half of the circle would be gray and so on.

  


  I am imagining something similar to this solution which is a progress bar, but I'm not sure if it's possible/how to make it a circular one.

  


  Thanks !

  


• Electron and NodeJS : Execute shell command asyncronously with live stream

  28 septembre 2020, par Bruno Freire

  Electron : get file conversion percent in real-time :

  


  I wanna run the command ffmpeg -i video.mp4 (example) to convert a video into another format. But I want to get the conversion percent that is streamed in the process output and get it in my Electron App or NodeJS.

  


  I've tried all methods : spawn fork exec and all of them return me the last line of the process output. I want a LIVE Stream of each line that is been written, to show the percent progress.

  


  I've tried :

  


  Fork

  


  const {fork} = require('child_process')
    const forked = fork('ffmpeg -i video.mp4');
    forked.on('message', (msg) => {
        console.log(msg);
})


  


  Exec Alternative 1

  


  const execFile = require('child_process').execFile;
    execFile('ffmpeg -i video.mp4', [], (e, stdout, stderr) => {
        if (e instanceof Error){
            console.error(e);
            
        }
        console.log('stdout ', stdout)
        console.log('stderr ', stderr);
})


  


  Exec Alternative 2

  


  const exec = require('child_process').exec;
    exec('ffmpeg -i video.mp4', (error, stdout, stderr) => { 
       console.log(stdout); 
});

/*EXEC Alternative 2*/
const exec = require('child_process').exec;
const proccessing = exec('ffmpeg -i video.mp4');
proccessing.stdout.on('data', function(data) {
  console.log(data); 
});
proccessing.stdout.pipe(process.stdout);


  


  Spawn

  


  const spawn = require('child_process').spawn,
const processing = spawn('ffmpeg -i video.mp4');

processing .stdout.on('data', function (data) {
   console.log('stdout: ' + data.toString());
});

processing .stderr.on('data', function (data) {
   console.log('stderr: ' + data.toString());
});

processing .on('exit', function (code) {
   console.log('code ' + code.toString());
});


  


  SUMMARY :

  


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