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• typeError when using ffmpeg with buffer in NodeJS ["argument must be of type string or an instance of Buffer"]

  16 mars 2021, par coolps811

  I am trying to covert buffer data into the correct mp4 video format. However I am getting an error : "UnhandledPromiseRejectionWarning : TypeError [ERR_INVALID_ARG_TYPE] : The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of FfmpegCommand". How can I fix this ?

  


  router.post("/download", (req, res, next) => {
  axios({
    method: "get",
    url: req.body.url,
    responseType: "arraybuffer",
  }).then(function (response) {
    const data = new Uint8Array(Buffer.from(response.data));

    const proc = new ffmpeg(data)
      .videoCodec("libx264")
      .outputOptions(["-movflags isml+frag_keyframe"])
      .toFormat("mp4")
      //.seekInput(offset) this is a problem with piping
      .on("error", function (err, stdout, stderr) {
        console.log("an error happened: " + err.message);
        console.log("ffmpeg stdout: " + stdout);
        console.log("ffmpeg stderr: " + stderr);
      })
      .on("end", function () {
        console.log("Processing finished !");
      })
      .on("progress", function (progress) {
        console.log("Processing: " + progress.percent + "% done");
      });

    fs.writeFile("Assets/test.mp4", proc, callback);
  });

  const callback = (err) => {
    if (err) throw err;
    console.log("It's saved!");
  };
});


  


• ffmpeg : "Impossible to convert between the formats" when using NVIDIA GPU hardware acceleration

  24 mai 2021, par MorenoGentili

  I'm using ffmpeg from the command line on Windows 10 and I wanted to gave GPU acceleration a try to improve execution times. A simple cut command like this works fine and its execution time is reduced by 60-70%. Awesome.

  


  ffmpeg -hwaccel cuvid -c:v h264_cuvid -ss 00:00:10 -i in.mp4 -c:v h264_nvenc out.mp4


  


  Now I tried to use the -filter_complex flag to overlay, fade and translate a png image over a video. The working non-GPU enhanced command is this one :

  


  ffmpeg -i in.mp4 -loop 1 -t 75 -i overlay.png -filter_complex "[1:v]fade=t=in:st=30:d=0.3:alpha=1,fade=t=out:st=35.7:d=0.3:alpha=1[png1];[0:v][png1]overlay=x='if(gte(t,30), (t-30)*10, NAN)'" -movflags +faststart out.mp4


  


  Then, I added the GPU-related flags to the command like this.

  


  ffmpeg -hwaccel cuvid -c:v h264_cuvid -i in.mp4 -loop 1 -t 75 -i overlay.png -filter_complex "[1:v]fade=t=in:st=30:d=0.3:alpha=1,fade=t=out:st=35.7:d=0.3:alpha=1[png1];[0:v][png1]overlay=x='if(gte(t,30), 60-tanh((t-30)*30/5)*60, NAN)'" -movflags +faststart -c:v h264_nvenc out.mp4


  


  But it won't work. I get this error.

  


  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  


  I don't even know what it means. Can I actually run ANY ffmpeg command on the GPU with GPU acceleration ? I've found some information about the hwupload_cuda flag but I'm not sure if I should use it and how. My attempts have failed so far.

  


  Any advice on how I should modify the command to make it work on the GPU ?

  


• ffmpeg how modify the contrast with nvidia "hevc_nvenc" codec

  12 juin 2021, par Marco999

  I need to adjust to contrast of some mkv file I have tried this code :

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i title00.mkv  -c:v hevc_nvenc -b:v 5M  -vf eq=contrast=1.0   output.mkv


  


  but I get this error :

  


  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  


  If I run the some line without "-vf eq=contrast=1.0" :

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i title00.mkv  -c:v hevc_nvenc -b:v 5M    output.mkv


  


  the command work and don't show any error message but don't allow me to adjust the contrast.

  


  There is a way to modify the contrast with nvidia hevc_nvenc codec ?