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• ffmpeg : How to save SSIM and PSNR to a file ?

  7 mars 2021, par idoo

  I'm a ffmpeg newbie.
I would like my script (on Windows) to output the average PSNR and average SSIM values to a file.
(but not the values for every frame)
I can output them to the standard output but not to a file.

  


  I use this line :

  


  ffmpeg -i ref.avi -i compressed.avi -lavfi  "ssim;[0:v][1:v]psnr" -f null -


  


  I understand I have to change something here : "-f null -" , but I cannot make it work.

  


• Invalid data when processing input ogg in ffmpeg

  23 mars 2023, par Albert Gomáriz Sancha

  I am getting an ogg file and I am trying to convert it to a mopo3 file using fluent-ffmpef node library. When trying to convert it, then this error is shown :** An error occurred : Error : ffmpeg exited with code 1 : pipe:0 : Invalid data found when processing input**.

  


  Can someone help me please ?

  


  This is my code :

  


   const input = createReadStream(getPath("temp.ogg"));
  // console.log(input);
  // ffmpeg.setFfmpegPath(ffmpegPath);

  // const output = createWriteStream(getPath("temp.mp3"));
  // spawn(`ffmpeg -i ${getPath("temp.ogg")} ${getPath("temp.mp3")}`);
  ffmpeg(input)
    .setFfmpegPath(ffmpegPath)
    .toFormat("wav")
    .on("data", (data) => {})
    .on("error", (err) => {
      console.log("An error occurred: " + err);
    })
    .on("progress", (progress) => {
      // console.log(JSON.stringify(progress));
      console.log("Processing: " + progress.targetSize + " KB converted");
    })
    .on("end", () => {
      console.log("Processing finished !");
    })
    .save(getPath("temp.mp3")); //path where you want to save your file


  


• How to decode the video stream of an mp4 file and save the decoded images to local directory in NodeJs

  8 août 2018, par Rohit Verma

  How to decode the video stream of an mp4 file and save the decoded images to local directory in NodeJs. I have tried ffmpeg and fluent ffmpeg but didn’t get clear idea how to use,As I was getting error while using fluent ffmpeg

  Code snippet :

      const ffmpeg = require('fluent-ffmpeg') 
  
      const probe = require('ffmpeg-probe')
  
  
  
  const info = await probe('input.mp4')

  and in case of ffmpeg I have tried this,

   var ffmpeg = require('ffmpeg');
  
  
  
   try {
  
      var process = new ffmpeg("VID_20160805_121411556.mp4");
  
      process.then(function (video) {
  
          // Callback mode
  
          video.fnExtractFrameToJPG('C:/Users/PcName/Documents', {
  
              frame_rate : 1,
  
              number : 5,
  
              file_name : 'my_frame_%t_%s'
  
          }, function (error, files) {
  
              if (!error)
  
                  console.log('Frames: ' + files);
  
          });
  
      }, function (err) {
  
          console.log('Error: ' + err);
  
      });
  
  } catch (e) {
  
      console.log(e.code);
  
      console.log(e.msg);
  
  }

  Nothing is working and I didn’t get any clue how to do so.