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• Youtube Readable stream, merge then trim using ffmpeg and ytdl-core

  13 avril 2023, par sol

  I am using FFmpeg-static in my express server to merge audio and video coming from Youtube Readable Stream then Trim. seems ok and working but im getting an error

  


  


  ffmpeg video input stream error : Error : write EPIPE

  


  ffmpeg audio input stream error : Error : write EPIPE

  


  


  then the triiming process has a glitch like freeze on the first second of the video output here is my code

  


  res.setHeader("Content-Disposition", attachment;  filename="${encodeURIComponent(info.videoDetails.title)}.mp4");

  let ffmpegArgs = [
      '-y', // Overwrite output file without asking
      '-i', 'pipe:3', // Read video stream from pipe 3
      '-i', 'pipe:4',
      '-map', '0:v',
      '-map', '1:a',
      '-c:v', 'copy',
      '-preset', 'ultrafast',
      '-b:v', '5000k',
      '-maxrate', '5000k',
      '-bufsize', '10000k',
      '-c:a', 'libmp3lame',
      '-crf', '18',
      '-preset', 'veryfast',
      '-movflags', 'frag_keyframe+empty_moov',
      '-f', 'mp4',
      '-loglevel', 'error'
  ];

  if (startTime && endTime) {
      ffmpegArgs = ffmpegArgs.concat(['-ss', startTime, '-to', endTime]); // Duration of the trimmed video
  }

  ffmpegArgs.push('-');

  let video = ytdl(url, { filter: 'videoonly', format: selectedFormat , highWaterMark: 1 << 25 })
  let audio = ytdl(url, { filter: 'audioonly', quality: 'highestaudio', highWaterMark: 1 << 25  });
  const ffmpegProcess = cp.spawn(ffmpeg, ffmpegArgs, {
      stdio: ['pipe', 'pipe', 'pipe', 'pipe', 'pipe'],
  });

  video.pipe(ffmpegProcess.stdio[3]); // Video stream to stdin (fd 3)
  audio.pipe(ffmpegProcess.stdio[4]);
      // Output the resulting merged and trimmed video to a file
      ffmpegProcess.stdio[1].pipe(res);

      // Handle the close event of the ffmpeg process
      ffmpegProcess.on('close', (code) => {
          if (code !== 0) {
            console.error(`ffmpeg process exited with code ${code}`);
          } else {
            console.log('ffmpeg process completed successfully');
            downloadedVideos.push({
              title: info.videoDetails.title,
              url: url,
              format: format
            });
          }
        });


  


  


  to the trim process i tried to move the -ss and -to to different lines but the freeze issue is still there

  


  i did try to add and error handling event but the output error is still the same error : write EPIPE

  


  


  
  // Pipe the video and audio streams to the ffmpeg process
          video.on('error', (err) => {
            console.error(`video stream error: ${err}`);
           });
            
          audio.on('error', (err) => {
            console.error(`audio stream error: ${err}`);
          });
            
          ffmpegProcess.stdio[3].on('error', (err)=> {
            console.error(`ffmpeg video input stream error: ${err} `);
          });
            
          ffmpegProcess.stdio[4].on('error', (err) => {
            console.error(`ffmpeg audio input stream error: ${err} `);
          });


  


• ffmpeg-static Trimming a merging audio and viddeo having a freeza at the first second

  13 avril 2023, par sol

  I am using FFmpeg-static in my express server to merge audio and video coming from Youtube Readable Stream then Trim. seems ok and working but im getting an error

  


  ffmpeg video input stream error : Error : write EPIPE
ffmpeg audio input stream error : Error : write EPIPE

  


  then the triiming process has a glitch like freeze on the first second of the video output

  


  here is my code

  


  res.setHeader("Content-Disposition", attachment;  filename="${encodeURIComponent(info.videoDetails.title)}.mp4") ;

  


    let ffmpegArgs = [
      '-y', // Overwrite output file without asking
      '-i', 'pipe:3', // Read video stream from pipe 3
      '-i', 'pipe:4',
      '-map', '0:v',
      '-map', '1:a',
      '-c:v', 'copy',
      '-preset', 'ultrafast',
      '-b:v', '5000k',
      '-maxrate', '5000k',
      '-bufsize', '10000k',
      '-c:a', 'libmp3lame',
      '-crf', '18',
      '-preset', 'veryfast',
      '-movflags', 'frag_keyframe+empty_moov',
      '-f', 'mp4',
      '-loglevel', 'error'
  ];

  if (startTime && endTime) {
      ffmpegArgs = ffmpegArgs.concat(['-ss', startTime, '-to', endTime]); // Duration of the trimmed video
  }

  ffmpegArgs.push('-');

  let video = ytdl(url, { filter: 'videoonly', format: selectedFormat , highWaterMark: 1 << 25 })
  let audio = ytdl(url, { filter: 'audioonly', quality: 'highestaudio', highWaterMark: 1 << 25  });
  const ffmpegProcess = cp.spawn(ffmpeg, ffmpegArgs, {
      stdio: ['pipe', 'pipe', 'pipe', 'pipe', 'pipe'],
  });

  video.pipe(ffmpegProcess.stdio[3]); // Video stream to stdin (fd 3)
  audio.pipe(ffmpegProcess.stdio[4]);
      // Output the resulting merged and trimmed video to a file
      ffmpegProcess.stdio[1].pipe(res);

      // Handle the close event of the ffmpeg process
      ffmpegProcess.on('close', (code) => {
          if (code !== 0) {
            console.error(`ffmpeg process exited with code ${code}`);
          } else {
            console.log('ffmpeg process completed successfully');
            downloadedVideos.push({
              title: info.videoDetails.title,
              url: url,
              format: format
            });
          }
        });


  


  to the trim process i tried to move the -ss and -to to different lines but the freeze issue is still there

  


  i did try to add and error handling event but the output error is still the same error : write EPIPE

  


    // Pipe the video and audio streams to the ffmpeg process
          video.on('error', (err) => {
            console.error(`video stream error: ${err}`);
           });
            
          audio.on('error', (err) => {
            console.error(`audio stream error: ${err}`);
          });
            
          ffmpegProcess.stdio[3].on('error', (err)=> {
            console.error(`ffmpeg video input stream error: ${err} `);
          });
            
          ffmpegProcess.stdio[4].on('error', (err) => {
            console.error(`ffmpeg audio input stream error: ${err} `);
          });


  


• Failed to convert web-saved .wemb audio to .wav by using php "shell_exec" and javascript

  30 mai 2022, par Anirbasgnaw

  I'm working on an online experimenter which could record participants' audio from the browser. The audio data I get has an extension of .wemb, so I plan to use ffmpeg to convert it to .wav while I save the data.

  


  I tried to use PHP's shell_exec but nothing happens when I run the scripts. Then I found that my echo and print_r also did not work. I'm new to PHP and javascript, so I''m really confused now.

  


  Below are the relevant codes, I really appreciate it if you could help !

  


  write_data.php :

  


  <?php
  $post_data = json_decode(file_get_contents('php://input'), true); 
  // the directory "data" must be writable by the server
  $name = "../".$post_data['filename'];
  $data = $post_data['filedata'];
   // write the file to disk
  file_put_contents($name, $data);
  
  $INPUT = trim($name) . ".webm";
  $OUTPUT = trim($name) . ".wav";
  echo "start converting...";

  // check if ffmprg is available
  $ffmpeg = trim(shell_exec('which ffmpeg'));
  print_r($ffmpeg);
  // call ffmpeg
  shell_exec("ffmpeg -i '$INPUT' -ac 1 -f wav '$OUTPUT' 2>&1 ");
?>


  


  javascript :

  


    saveData: function(fileName,format){
    // save  as json by default
    if (!format){ format = 'json';}
    // add extension to filename
    fileName = `${fileName}.${format}`
    // create saveData object using fetch
    let saveData = [];
    if (format == 'json') {
        saveData = {
          type: 'call-function',
          async: true,
          func: async function(done) {
            let data = jsPsych.data.get().json();
            const response = await fetch("../write_data.php", {
              method: "POST",
              headers: {
                "content-type": "application/json"
              },
              body: JSON.stringify({ filename: fileName, filedata: data })
            });
            if (response.ok) {
              const responseBody = await response.text();
              done(responseBody);
            }
          }
        }
    } else {
        saveData = {
          type: 'call-function',
          async: true,
          func: async function(done) {
            let data = jsPsych.data.get().csv();
            const response = await fetch("../write_data.php", {
              method: "POST",
              headers: {
                "content-type": "application/json"
              },
              body: JSON.stringify({ filename: fileName, filedata: data })
            });
            if (response.ok) {
              const responseBody = await response.text();
              done(responseBody);
            }
          }
        }
    }
    return saveData;
  },