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• Video Manipulation with ffmpeg : Troubleshooting Conversion Issues

  26 janvier 2024, par Barno

  I want to manipulate my video using ffmpeg. I retrieve the stream from S3 with the following function :

  


  async function getImageBufferFromS3(imageUrl) {
    const { bucketName, objectKey } = extractS3InfoFromUrl(imageUrl);
    const s3Client = configureS3Client();

    const getObjectCommand = new GetObjectCommand({
        Bucket: bucketName,
        Key: objectKey
    });

    const data = await s3Client.send(getObjectCommand);
    const imageBuffer = await streamToBuffer(data.Body);
    return imageBuffer;
}

async function streamToBuffer(stream) {
    return new Promise((resolve, reject) => {
        const chunks = [];
        stream.on('data', (chunk) => chunks.push(chunk));
        stream.on('error', reject);
        stream.on('end', () => resolve(Buffer.concat(chunks)));
    });
}


  


  Now, I want to use ffmpeg to add text to it. First, I'd like to obtain the "clean" video :

  


  module.exports.createVideoWithTextAndBackground = async (videoBuffer, customText = null) => {
  try {
    if (!customText) {
      return videoBuffer;
    }
    
    const fontPath = __dirname + '/../public/fonts/Satoshi-Medium.ttf';

    try {
      return await new Promise((resolve, reject) => {
        const input = new stream.PassThrough();
        input.end(videoBuffer);

        const output = new stream.Writable();
        const chunks = [];

        output._write = (chunk, encoding, next) => {
          chunks.push(chunk);
          next();
        };

        output.on('finish', () => {
          const resultBuffer = Buffer.concat(chunks);
          resolve(resultBuffer);
        });

        output.on('error', (err) => {
          reject(err);
        });

        ffmpeg()
          .input(input)
          .inputFormat('mp4')
          .toFormat('mp4')
          .pipe(output);
      });
    } catch (error) {
      console.error(error);
      throw error;
    }

  } catch (error) {
    console.error(error);
    throw error;
  }
};


  


  However, I encountered the following error :

  


  Error: ffmpeg exited with code 183: frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A


  


  Conversion failed !

  


  I don't face any issues when I don't use ffmpeg. I even tried ffmpeg -i to create a video with text using my console, confirming that ffmpeg works on my computer.

  


• Issues with MediaSourceExtension

  4 janvier 2023, par engine32

  I want to livestream audio only using MSE. I would like to send data/files via websockets, therefore no HLS nor DASH.

  


  But until I implement websockets, I thought to give it a try by statically loading the song in an array.

  


  Here is my code so far :

  


  <audio controls="controls"></audio>&#xA;..&#xA;<code class="echappe-js">&lt;script&gt;&amp;#xA;  const ms = new MediaSource();&amp;#xA;  var ae = document.getElementById(&quot;ap&quot;);&amp;#xA;  ae.src = URL.createObjectURL(ms);&amp;#xA;  ms.addEventListener(&amp;#x27;sourceopen&amp;#x27;, msOpen);&amp;#xA;  &amp;#xA;function msOpen(e) {&amp;#xA;  URL.revokeObjectURL(ae.src);&amp;#xA;  var mse = e.target;&amp;#xA;  const sourceBuffer = mse.addSourceBuffer(&amp;#x27;audio/mp4&amp;#x27;);&amp;#xA;  var u8A0 = new Uint8Array([0x00, 0x00, 0x00, 0x1C, 0x66, ...]);&amp;#xA;  sourceBuffer.appendBuffer(u8A0.buffer);&amp;#xA;  &amp;#xA;  sourceBuffer.addEventListener(&amp;#x27;updateend&amp;#x27;, function() {&amp;#xA;    if (!sourceBuffer.updating &amp;amp;&amp;amp; mse.readyState === &amp;#x27;open&amp;#x27;) {&amp;#xA;      mse.endOfStream();&amp;#xA;      console.log(&amp;#x27;Audio is ready to play!&amp;#x27;);&amp;#xA;    }&amp;#xA;  });&amp;#xA;}  &amp;#xA;&lt;/script&gt;&#xA;&#xA;

  


  The result is that there are no errors in the debug window and the audio element correctly shows the duration of the song, about two min and half. However, once I click Play, the duration shows 0 (zero) and the song is not played. If I try to pause and play again, the debug window says :

  


  *"Uncaught (in promise) DOMException : The fetching process for the media resource was aborted by the user agent at the user's request".
*
This is the ffmpeg command I used to prepare the file :

  


  ffmpeg -i m.wav -c:a aac -b:a 32k -f mp4 output.mp4

  


  Any help would be well appreciated.
Thank you.

  


• Révision 93293 : Fix https://core.spip.net/issues/3425 :

  29 novembre 2015, par cedric@yterium.com

  - ajouter compresseur_embarquer_images_css a $GLOBALS[’spip_matrice’] pour permettre au compresseur de trouver le filtre
  - utiliser chercher_filtre dans le processing de la css pour trouver les filtres ajoutes
  - ajouter un argument $source_file a compresseur_embarquer_images_css pour lui permettre de trouver les images
  - ajout d’une constante _CSS_EMBARQUE_FICHIER_MAX_SIZE par defaut a 16ko pour limiter la taille des images embarquees dans les CSS