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• ffmpeg extract subclips from video at 10s ; 30% ; 60% ; last 30s of a video

  2 juillet 2018, par martins

  I am writing Bash command on a Mac Terminal. To be able to use a loop, I’d like to extract 4 subclips of different inputfile .mp4 videos : 1st subclip (from second 10 to 20), 2nd subclip (10 seconds starting at a 33% stage of the inputfile), 3rd subclip (10 seconds starting at a 66% of the inputfile), and a 4th subclip (10 seconds starting 30seconds before the end of the inputfile).

  So far I only know how to make it work with fixed timings (i.e. seconds) but these correspond only to my first video (I have +200) :

  #!/bin/bash
  
  for file in *.mp4; do ffmpeg -i "$file" -vf "select='between(t, 10, 20) + between(t, 197, 207) + between(t, 393, 403) + between(t, 570,580)',
  
  setpts=N/FRAME_RATE/TB" -qscale 0 -af "aselect='between(t, 10, 20) + 
  
  between(t, 197, 207) + between(t, 393, 403) + between(t, 570, 580)', 
  
  asetpts=N/SR/TB" ${file%.mp4}_1.mp4; done

  For the first subclip, I always want from second 10 to 20, so I can leave it as it is, but for the 2nd to 4th subclip I need some formulas, but no idea which ones. Any suggestions ?

  Thanks for your time

• Download a stream via ffmpeg in Node.js

  16 juillet 2018, par loretoparisi

  I’m using ffmpeg to download an audio stream in Node.js. I use child_process for that :

  var downloadStream = function(uri,opath) {
  
      var self=this;
  
  
  
      // defaults
  
      var loglevel= self.logger.isDebug() ? 'debug' : 'warning';
  
      return new Promise((resolve, reject) => {
  
        const args = [
  
          '-y',
  
          '-loglevel', loglevel,
  
          '-v', 'quiet',
  
          '-i', uri,
  
          opath
  
        ];
  
        const opts = {
  
          cwd: self._options.tempDir
  
        };
  
        cp.spawn('ffmpeg', args, opts)
  
          .on('message', msg => self.logger.info(msg))
  
          .on('error', reject)
  
          .on('close', resolve)
  
          .on('exit', function (code, signal) {
  
            console.log('child process exited with ' +
  
                        `code ${code} and signal ${signal}`);
  
                        resolve(code);
  
          });
  
      });
  
    }//downloadStream

  What happens is that the close event is called before the file has been written to the disk. I have also registered the exit that is called with the close. While executing the command in bash I get the stream saved in the opath as expected. Which event listener shall I register for that ?

• How to import fluent-ffmpeg in aws lamdba ?

  3 octobre 2019, par Fook

  I’m trying to use fluent-ffmpeg in AWS Lambda, but cannot get it setup correctly. At the top of my index.js :

  import ffmpeg from "fluent-ffmpeg";

  But it is always undefined.

  ffmpeg === undefined.

  I’m using Serverless and have ffmpeg included as a layer.

  serverless.yaml

  functions:
  
    createGifFromVideo:
  
      handler: src/services/createGifFromVideo/index.handler
  
      layers:
  
        - { Ref: FfmpegLambdaLayer }
  
      events:
  
        - sns: arn:aws:sns:us-east-1:${self:custom.accountId}:NewVideoPostContentTopic-${self:provider.stage}
  
  
  
  layers:
  
    ffmpeg:
  
      path: src/layers

  package.json

  {
  
    "name": "createGifFromVideo",
  
    "version": "1.0.0",
  
    "main": "index.js",
  
    "license": "MIT",
  
    "private": true,
  
    "dependencies": {
  
      "fluent-ffmpeg": "^2.1.2"
  
    }
  
  }

  The uploaded lambda seems to be constructed correctly from what I can tell. Webpack builds the file with fluent-ffmpeg merged in and it is linked to the ffmpeg layer.

  I can load other packages. It’s just fluent-ffmpeg that comes back undefined.

  From the docs it mentions passing FFMPEG_PATH and FFPROBE_PATH as environment variables. Are these necessary with a layer ?

  I would be grateful to see a configuration that works.