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• building ZVBI for arm7

  14 janvier 2014, par Dinesh

  I am trying to build zvbi lib for ios arm7 architecture. If any body has done this earlier can give me some pointers. I have managed to build the same for simulator using

  ./configure prefix=""           CC="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/us r/bin/gcc" CFLAGS="-arch i386" LDFLAGS="-arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk"

  But i am not sure how to build the same with arm Architecture.

• How do I use a fetch response object with fluent-ffmpeg ?

  5 août 2024, par chovy

  The following code throws an error :

  


  async start(url, user = null, pass = null) {
            console.log('Transcoding:', url);
            const headers = {};

            try {
                if (user && pass) {
                    const encodedCredentials = Buffer.from(`${user}:${pass}`).toString('base64');
                    headers['Authorization'] = `Basic ${encodedCredentials}`;
                }

                // Fetch the video from the URL
                const response = await fetch(url, { headers, redirect: 'follow' });

                if (!response.ok) {
                    throw new Error(`Failed to fetch video: ${response.statusText}`);
                }

                // Create a readable stream from the response
                // const videoStream = response.body;
                const videoStream = response.body;

                console.log(videoStream);

                // Ensure videoStream is a valid readable stream
                if (!videoStream) {
                    throw new Error('Failed to get video stream from response');
                }

                // Create a pass-through stream to handle ffmpeg output
                const outputStream = new PassThrough();

                // Pipe the video stream through ffmpeg to transcode it to mp4
                ffmpeg(videoStream)
                    .format('mp4')
                    // .output(outputStream)
                    .videoCodec('libx264')
                    .audioCodec('aac')
                    .on('start', (commandLine) => {
                        console.log('Spawned Ffmpeg with command: ' + commandLine);
                    })
                    .on('error', (err) => {
                        console.error('Error:', err.message);
                        console.error(err);
                        outputStream.destroy(err); // destroy the stream in case of error
                    })
                    .on('progress', (progress) => {
                        console.log(JSON.stringify(progress, null, 2));
                        console.log('Processing: ' + progress.percent + '% done');
                    })
                    .on('end', () => {
                        console.log('Transcoding finished');
                    })
                    .pipe(outputStream);

                return outputStream;
            } catch (err) {
                throw err;
            }
        }


  


  Here's the error message :

  


  Spawned Ffmpeg with command: ffmpeg -i pipe:0 -acodec aac -vcodec libx264 -f mp4 pipe:1&#xA;{&#xA;  "frames": 0,&#xA;  "currentFps": 0,&#xA;  "currentKbps": null,&#xA;  "targetSize": 0,&#xA;  "timemark": "N/A"&#xA;}&#xA;Processing: undefined% done&#xA;Error: ffmpeg exited with code 234: Conversion failed!&#xA;&#xA;Error: ffmpeg exited with code 234: Conversion failed!&#xA;&#xA;    at ChildProcess.<anonymous> (/home/ettinger/src/watch.theater/watchtheater-web/node_modules/.pnpm/fluent-ffmpeg@2.1.3/node_modules/fluent-ffmpeg/lib/processor.js:180:22)&#xA;    at ChildProcess.emit (node:events:518:28)&#xA;    at ChildProcess._handle.onexit (node:internal/child_process:294:12)&#xA;</anonymous>

  


  I'm trying to stream the output in real-time without having to download the entire video file first.

  


• 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;
  },