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• How to create a m3u8 Byte-Range playlist without creating a new file

  20 mars 2019, par Rodrigo Valença

  I’ve found some nice related questions,such as this one How to create byte-range m3u8 playlist for HLS ? but the best answer, that provide us this ffmpeg command ffmpeg -i sample.ts -hls_time 20 -hls_flags single_file out.m3u8 creates a new .ts file to use in the m3u8. In my application we need to create the m3u8 file, but we want it to be faster than the solution provided, it was unworkable for us. I think that the provided solution is a little slow ’cause it has to create a new file, do you guys know a solution that uses a already existing encoded ts file ?

• How to set the length metadata property with fluent-ffmpeg ?

  8 avril 2024, par volume one

  I have transcoded a sample video using fluent-ffpmeg and want to set the length metadata property so that the <video></video> player knows how long the video is going to be.

  


  To get the duration of the video I did this :

  


  import ffmpeg from 'fluent-ffmpeg';

function ffprobePromise() {
            return new Promise((resolve, reject) => {
                ffmpeg.ffprobe('/path/to/file'), function (err, metadata) {
                    FileDuration = metadata.format.duration;
                    resolve()
                });
            })}

  await ffprobePromise();

  ffmpeg('path/to/output')
                    .videoCodec('libx264')
                    .audioCodec('libmp3lame')
                    .duration(FileDuration)   // !! not setting 'length' metadata property in file
                    .size(`960x400`)
                    // Stream output requires manually specifying output formats
                    .format('mp4')
                    .outputOptions(['-movflags dash', `-metadata length=${FileDuration}`]) // also not setting length in metadata


  


  Here is the sample file that was created : https://devxxx001.s3.amazonaws.com/sample_960x400_47sec.mp4

  


  If you download and view the properties of that file, there is no length property in the metadata. Hence when you play the file, the video player is not able to determine the total duration of the video. You'll notice it keeps jumping up as the video plays.

  


  The ffmpeg documentation states that you can use ffmpeg -i in.avi -metadata title="my title" out.flv to set the title for example. But how do you do this with fluent-ffmpeg ?

  


• Download a stream via ffmpeg in Node.js

  16 juillet 2018, par loretoparisi

  I’m using ffmpeg to download an audio stream in Node.js. I use child_process for that :

  var downloadStream = function(uri,opath) {
  
      var self=this;
  
  
  
      // defaults
  
      var loglevel= self.logger.isDebug() ? 'debug' : 'warning';
  
      return new Promise((resolve, reject) => {
  
        const args = [
  
          '-y',
  
          '-loglevel', loglevel,
  
          '-v', 'quiet',
  
          '-i', uri,
  
          opath
  
        ];
  
        const opts = {
  
          cwd: self._options.tempDir
  
        };
  
        cp.spawn('ffmpeg', args, opts)
  
          .on('message', msg => self.logger.info(msg))
  
          .on('error', reject)
  
          .on('close', resolve)
  
          .on('exit', function (code, signal) {
  
            console.log('child process exited with ' +
  
                        `code ${code} and signal ${signal}`);
  
                        resolve(code);
  
          });
  
      });
  
    }//downloadStream

  What happens is that the close event is called before the file has been written to the disk. I have also registered the exit that is called with the close. While executing the command in bash I get the stream saved in the opath as expected. Which event listener shall I register for that ?