CODEWITHSUNDEEP
node.jsffmpegthumbnails
Jedavard
Jedavard

Reputation: 119

Which ffmpeg command sequence can generate the first frame of the video [Need thumbnails for Node.js app]

I'm trying to make thumbnails for videos, but the problem is I'm not able to write some right ffmpeg commands for getting the very first frame. This is for a Node.js AWS Lambda function.

I tried this, but it's not working for me.

-vf "select=eq(n\,0)"

Tried all from here How to extract the 1st frame and restore as an image with ffmpeg?.

Here's my command line, I copied it and honestly I have no idea about this commands.

function createImage(type) {
    return new Promise((resolve, reject) => {
      let tmpFile = fs.createWriteStream(`/tmp/screenshot.${type}`);
      const ffmpeg = spawn(ffmpegPath, [
      '-ss',
      '00:00:00.01',
      '-i',
      target,
      '-vf',
      `thumbnail`,
      '-qscale:v',
      '2',
      '-frames:v',
      '1',
      '-f',
      'image2',
      '-c:v',
      'mjpeg',
      'pipe:1',
    ]);


  ffmpeg.stdout.pipe(tmpFile);

  ffmpeg.on('close', function(code) {
    tmpFile.end();
    resolve();
  });

  ffmpeg.on('error', function(err) {
    console.log(err);
    reject();
  });
});
}

(I use this https://johnvansickle.com/ffmpeg/ release 4.2.3 version on a Node child process.)

Upvotes: 2

Views: 503

Answers (1)

Benjie Wheeler
Benjie Wheeler

Reputation: 575

This should get you the result you wanted.

You had some extra arguments in your command. You should read the ffmpeg documentation.

function createImage(type) {
    return new Promise((resolve, reject) => {
        let tmpFile = fs.createWriteStream(`./screenshot.${type}`);
        const ffmpeg = spawn(ffmpegPath, [
            '-i', target,
            '-r', '1',
            '-vframes', '1',
            '-f', 'image2',
            '-qscale:v', '2',
            '-c:v', 'mjpeg',
            'pipe:1'
        ]);


        ffmpeg.stdout.pipe(tmpFile);

        ffmpeg.on('close', code => {
            tmpFile.end();
            resolve();
        });

        ffmpeg.on('error', err => {
            console.log(err);
            reject();
        });
    });
}


createImage("jpg");

Upvotes: 1

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