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• I want to crop videos with black frames on top and bottom

  10 février 2019, par jennie

  I want to crop videos with black frames on the bottom and top according to the frame rate as described in the video after crop

  how with ffmpeg ? How to crop Black Bars from Video

  Can you help me ! thank you so much !

  I want to crop videos with black frames on the bottom and top follow the scale as described in the video .

  Example image video

  video image after crop

  video after crop

• avcodec/pngdec : do not blend on transparent black

  28 novembre 2014, par Benoit Fouet

  avcodec/pngdec : do not blend on transparent black
  There is no need to memset the zlib output buffer, as there is no
  
  blending happening there. Instead, do not blend when the dispose
  
  operation is set to ’background’ (tranparent black).
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/pngdec.c

• Black detect ffmpeg and use in a javascript

  6 février 2023, par sol

  I had an ffmpeg script that allow me to detect black frames from a video file sample from the bottom.

  


  and i want to create a javascript code that will allow me to do the same function sample from the bottom but its not working.

  


  original code from ffmpeg script :

  


  `ffmpeg -i LKE-BLACK.mp4 -vf "blackdetect=d=0.5:pix_th=0.10" -an -f null - 2>&1 | findstr blackdetect > output.txt

  


  node script :

  


  var fs = require('fs');
const ffmpeg = require("ffmpeg.js");

var createStream = fs.createWriteStream("data.txt");
createStream.end();

const transcode = async ({ target: { files }  }) => {
    message.innerHTML = 'Loading ffmpeg-core.js';
    await ffmpeg.load();
    message.innerHTML = 'Start transcoding';
    
    await ffmpeg.transcode('-i', 'LKE-BLACK.mp4', "-vf", "blackdetect=d=0.5:pix_th=0.10", '-an', '-f', 'null - 2>&1', );
    message.innerHTML = 'Complete transcoding';

    fs.writeFile("data.txt", function (err) {
        if (err) throw err;
        console.log('File is created successfully.');
      });
}