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• (Folderwide) Bulk conversion in ffmpeg to a H264 codec

  5 mars 2021, par Habboman

  So I was trying to get a hang of ffmpeg but I am not very good at it. I am trying to get all .mkv files converted to .m4v with a H264 codec. From another project I know that the h264_cuvid decoder worked perfectly well for my needs. I also checked via ffmpeg -decoders that I wrote it correctly. So the windows-batchfile (I frankenstein-ed together from other forums) looks like this :

  


  for %%a in ("*.mkv") do ffmpeg -i "%%a" -c:v h264_cuvid -preset fast -crf 20 -b:v 128k "newfiles\%%~na.m4v"
pause


  


  What I get is sadly only :

  


  


  unknown encoder 'h264_cuvid'

  


  


  How do I solve this ?

  


  If it is easier to start from scratch following is what I am trying to achieve

  


  I am pretty new to this whole conversion/coding thing. I got a raspberry pi as a homeserver for my video files. Sadly it can only direct stream correctly encoded files (H.264), otherwise the Pi is trying to encode the videos itself (what causes buffering). So I am trying to find a solution to throw my whole library into a folder and convert it to a usable format.

  


• ffmpeg hangs when muxing longer videos

  11 août 2020, par 492357816

  I am using ffmpeg with Janus WebRTC server for muxing video conference recordings. For video conferences under approximaately 5 minutes duration, existing code works well. If the source files are longer than that the process appears to hang without returning either an error or a completed file.
Any advice/suggestions would be most welcome.

  


      var recordingsPath = exports.recordingsPath;
    var videoRecordingPath = `${recordingsPath}/${filename}-video.mjr`;
    var audioRecordingPath = `${recordingsPath}/${filename}-audio.mjr`;
    var videoOutputPath = `${recordingsPath}/${filename}-output1.mp4`;
    var audioOutputPath = `${recordingsPath}/${filename}-output1.wav`;
    var finalOutputPath = `${recordingsPath}/${filename}-final.mp4`;
    var rawConverterPath = "/opt/janus/bin/janus-pp-rec";
    var audioRecordingByteSize = exports.getFileSizeInBytes(audioRecordingPath);
    var audioIsValid = audioRecordingByteSize > 8;

    if (audioIsValid) {
        //turn audio and video mjr files into .wav and mp4 respectively
        exports.runBashSync([ rawConverterPath, videoRecordingPath, videoOutputPath]);
        exports.runBashSync([ rawConverterPath, audioRecordingPath, audioOutputPath]);
        return exports.mergeMp4AndWav(
            audioOutputPath, videoOutputPath, finalOutputPath
        ).then(function(result) {
            // remove source data for audio & video
            exports.runBashSync([ "rm", audioOutputPath]);
            exports.runBashSync([ "rm", videoOutputPath]);
            exports.runBashSync([ "rm", audioRecordingPath]);
            exports.runBashSync([ "rm", videoRecordingPath]);
        });
    } else {
        // handle cases where audio is not available
        feedback("no audio");
        return new Promise(function(resolve) {
            exports.runBashSync([ rawConverterPath, videoRecordingPath, finalOutputPath], true);
            if (Number.isInteger(audioRecordingByteSize)) {
                exports.runBashSync([ "rm", audioRecordingPath]);
            }
            exports.runBashSync([ "rm", videoRecordingPath]);
            resolve(true);
        });
    }
};

exports.joinMp4s = function(mp4Filenames, outputPath) {
    feedback("joining mp4s");
    if (mp4Filenames.length === 1) {
        feedback("single-stream case");
        exports.runBashSync(["mv", mp4Filenames[0], outputPath]);
        return new Promise(function(resolve) { resolve(true); });
    }
    feedback("multi-stream case");
    var joinCmd = ["ffmpeg"];
    mp4Filenames.forEach(function(filename) {
        joinCmd.push(`-i ${filename}`);
    });
    joinCmd.push("-strict -2");
    var totalHeight = 960;
    var totalWidth = 1280;

    joinCmd.push(`-filter_complex "color=size=${totalWidth}x${totalHeight}:c=Black [base];`);

    // var numStrms = mp4Filenames.length;
    var streamsPattern = exports.setStreamsPattern(mp4Filenames);
    var strmHeight = streamsPattern.height;
    var strmWidth = streamsPattern.width;
    var strmDmns = `${strmWidth}x${strmHeight}`;
    feedback("streamDimensions: " + strmDmns);

    var i;
    for (i = 0; i < mp4Filenames.length; i++) {
        joinCmd.push(`[${i}:v] setpts=PTS-STARTPTS, scale=${strmDmns} [temp${i}];`);
    }
    for (i = 0; i < mp4Filenames.length; i++) {
        var xCoord;
        var yCoord;
        if (i === 0) {
            xCoord = streamsPattern.coords[i].xCoord;
            yCoord = streamsPattern.coords[i].yCoord;
            joinCmd.push(`[base][temp${i}] overlay=shortest=1:x=${xCoord}:y=${yCoord} [tmp${i + 1}];`);
            // joinCmd.push(`[base][temp${i}] overlay=shortest=1 [tmp${i + 1}];`);
        } else {
            var cmd = `[tmp${i}][temp${i}] overlay=shortest=1`;
            xCoord = streamsPattern.coords[i].xCoord;
            yCoord = streamsPattern.coords[i].yCoord;

            if (xCoord) { cmd += ":x=" + xCoord; }
            if (yCoord) { cmd += ":y=" + yCoord; }

            if (i + 1 !== mp4Filenames.length) { cmd += ` [tmp${i + 1}];`; }
            joinCmd.push(cmd);
        }
    }

    joinCmd.push(`" ${outputPath}`);
    feedback("join command: " + joinCmd);
    return exports.runBashAsync(joinCmd).then(function(result) {

        mp4Filenames.forEach(function(filename) {
            feedback("removing: " + filename);
            exports.runBashSync(`rm ${filename}`);
        });
    });
};



  


• node ffmpeg module stuck more than one file

  29 mai 2021, par Muhammad Hamza

  when I read more than one file it will be stuck and also hang my pc. I need to restart my pc

  


  on one file or 5 files it will work perfectly but not more than 5 files

  


  if anyone know this issue let me know

  


  const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path
const ffmpeg = require('fluent-ffmpeg')
ffmpeg.setFfmpegPath(ffmpegPath)


const testFolder = './videos/';
const fs = require('fs');

 


fs.readdir(testFolder, async(err, files) => {
  try {
    for(let i = 0; i < 10; i++){
      if(files[i] != '1 Surah Fatiha Dr Israr Ahmed Urdu - 81of81.mp4'){
        
        let converter = await ffmpeg(`./videos/${files[i]}`)
        await converter.setStartTime('00:00:00').setDuration('30').output(`./outputfolder/${files[i]}`).on('end', function(err) {
        if(err) { 
          console.log(`err durinng conversation \n ${err}`) 
        }
        else{
          console.log(`Done ${files[i]}`);
        }
        }).on('error', function(err){
          console.log(`error: ${files[i]}`, err)
        }).run()
      }
    }
  } catch (error) {
    console.log(error)
  }
});