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• Rendering video by ffmpeg.wasm in browser occured an error

  15 septembre 2022, par James Bor

  When a local video renderer uses the ffmpeg.wasm library in the Chrome browser, very often an error with the SBOX_FATAL_MEMORY_EXCEEDED code occurs during the rendering process. The standard command set is used. The code below is half fake because it is very long, but describes an approximate action algorithm. Computer performance and RAM capacity do not affect the video, files used - minimal size. Has anyone experienced this and how can we solve it ?
Error screen

  


  const videoGenerate = async (project) => {
  const ffmpeg = createFFmpeg({
      corePath: 'ffmpeg/ffmpeg-core.js',
      workerPath: 'ffmpeg/ffmpeg-core.worker.js'
  });
  await loadFfmpeg(ffmpeg);
  project.projectName = "Default";
  project.fileType = "video/mp4";

  const resultVideo = {
    title: `${project.projectName}ConcatenatedVideo.mp4`,
  };
  // *For fetchFile method and ffmpeg.FS('writeFile', title, file);
  await uploadObjects(project.projectName, ffmpeg);
  // *
  const command = ['-i', project.video, resultVideo.title];
  await ffmpeg.run(...command);
  await ffmpeg.FS("unlink", resultVideo.title);
  resultVideo["blob"] = ffmpeg.FS('readFile', title);
  return resultVideo.blob;
};


  


  These dependencies are used : "@ffmpeg/core" : " 0.8.5", "@ffmpeg/ffmpeg" : " 0.9.7". Upgrading the library to the latest version does not work either.

  


• FFMPEG output the wrong color when using it with BackColour / OutlineColour

  5 mai 2023, par Youssef

  I have tried both OutlineColour, BackColour and BoxColour none of this worked well with colors, only black/white in both opaque and with transparency works. I am not sure how to fix this code, It's been 3 days searching for a solution

  


  my color is E63946 clearly it's red

  


  

  


  When making the necessary adjustments with the code below

  


    const bgColorHex = '#E63946';
  const bgColorFFmpeg = bgColorHex.replace('#', '&H00');
  console.log(bgColorFFmpeg);


  


  I use with the code below

  


   const ffmpeg = spawn("ffmpeg", [
    "-i",
    "test.mp4",
    "-vf",
    `subtitles=${subtitlePath}:force_style='BorderStyle=3,Shadow=no,BackColour=${bgColorFFmpeg},OutlineColour=${bgColorFFmpeg}'`,
    "-c:a",
    "copy",
    "-progress", "pipe:1",
    outputPath,
  ]); 


  


  This is the result I get

  


  

  


  I tried other methods like with tinycolor, same issue

  


  const bgColor = `&H${tinycolor(bgColorHex).toHex8().substr(2)}`;


  


  Please help this is very confusing it should be easy to input a color into ffmpeg, text color on the other hand gave me no issue at all only this captions background is causing problems.

  


  Let me know if you need more info

  


• Image becomes transparent on downscaling with ffmpeg

  11 août 2021, par deepakgupta191199

  This is the original image of 200x200

  


  

  


  On downscaling the image to 100x100. There is a semi transparent shadow near the lines and some pixels are not completely opaque.

  


  

  


  The command used for scaling :
ffmpeg -i test.png -vf scale=100x100 out.png

  


  I have also tried scaling with this command :
ffmpeg -i test.png -vf scale=100x100 -sws_flags neighbor out.png

  


  The shadows are gone but the top line has also vanished.

  


  

  


  How do I fix this ?