Recherche avancée

Sur d’autres sites (4539)

• NodeJS - Looking for faster ways to create FFMPEG thumbnails

  18 mars 2016, par RunningFromShia

  I am using fluent-ffmpeg and ffmpeg in node :

  var ffmpeg = require('fluent-ffmpeg');
  
  var src = "http://upload.wikimedia.org/wikipedia/commons/7/79/Big_Buck_Bunny_small.ogv";
  
  ffmpeg(src)
  
  .on('filenames', function(filenames) {
  
      console.log('Will generate ' + filenames.join(', ') + ' into tempfiles.')
  
  })
  
  .on('end', function() {
  
      console.log('1 Screenshot successfully taken');
  
  
  
  })
  
  .on('error', function(err, stdout, stderr) {
  
  console.log("ffmpeg stdout:\n" + stdout);
  
  console.log("ffmpeg stderr:\n" + stderr);
  
  })
  
  .screenshots({
  
      filename: randomResult,
  
      timemarks: [520.929831],
  
      folder: '/'
  
  });

  Usually, it takes 2-3 seconds to take one thumbnail.
  I need it to be 0.5-1 seconds for real-time development. I mean, what is the problem here - downloading a single png file on my computer takes way below 2-3 seconds to complete, why is ffmpeg lagging so much ? something just doesn’t seem right.

• Extracting frame every 30 seconds using FFmpeg is slow

  30 août 2020, par Nitesh S

  We are extracting frame every 30 seconds from mp4 file with following FFmpeg command :

  


  ffmpeg -vsync 0 -i file.mp4 -vf fps=1,select='not(mod(t,30))' -frame_pts 1 temp\file.%d.jpg

  


  We are using vsync and frame_pts options since we need frame's position w.r.t. seconds in output file names. It is running slow. It takes around 90 seconds to extract around 235 images from 118 minutes (259 MB) mp4 file. CPU usage while running this command goes 100%.

  


  We are using this command in multi-threaded java application. During load test, we found that with 10 threads running this command simultaneously, time to complete this command is 5-15 minutes.

  


  Is there any way to improve performance of this FFmpeg command ?

  


• NodeJS - Stream MP3 Audio Playlist from fixed HTTP endpoint

  10 octobre 2018, par msafi

  I’d like to stream a playlist of mp3 audio files from a fixed HTTP endpoint on my server, e.g. http://localhost/stream.mp3. I am dynamically generating a number of mp3 files, so when I setup this fixed endpoint, I don’t yet have a complete list of the audio files I want to broadcast.

  Is there a way in which I can generate this kind of fixed streaming endpoint and start with one file, and then queue up the rest as I continue to generate them ? I’m using NodeJS/Express as my web-server, and generating my audio files with FFMPEG.