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• 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.

  


• 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.

  


• Having issues finding the options to lower Quality with Animation Codec

  1er octobre 2018, par Necessary Null

  I’m trying to find if its possible to specify quality when converting to animation codec.

  I’ve used this bit of code and don’t see anything about quality.

  ffmpeg -h encoder=qtrle

  I know this is my generic command to get to animation codec

  ffmpeg -i input.mp4 -codec copy -c:v qtrle output.mov

  Any advice ?