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• Downloading videos one by one with youtube-dl

  9 août 2019, par puter

  Im trying to execute the youtube-dl download command from node which is asynchronous and I have a bunch of videos that gets downloaded each time so I want to execute the downloadClip command as soon as each one finishes. How do I call this function in a chain like fashion so that only one video gets downloaded at a time ?

  var downloadClip = function( videoID, channelPath ) {
  
      var args = [
  
          '-o', config.fileName,
  
          '--download-archive', channelPath + '/' + config.archiveFile,
  
      ];
  
  
  
      var options = {
  
          cwd: channelPath
  
      };
  
  
  
      return new Promise( function( resolve, reject ) {
  
          ytdl.exec( videoID, args, options, function( err, output ) {
  
              if ( err ) {
  
                  reject( err );
  
              } else {
  
                  resolve( output );
  
              }
  
          } );
  
      } );
  
  };

• ffmpeg scale down video dynamically (squeeze-back) or zoompan out to smaller than original

  27 avril, par Sam

  I have 2 videos, I'm trying to overlay one on top of the other, and have it shrink down in an animated fashion until it appears like a picture-in-picture setup. Then, after a few seconds it should scale back up.

  


  This is what I am trying to achieve (these would be videos, not images) :


  


  This is the closest I've been able to get, but, crucially, zoompanning "out" (as opposed to "in") does not appear to work ; so, of course, this does not work :

  


  ffmpeg -i bg.mov -i top.mov -filter_complex "[0:v]zoompan=z='pzoom-0.1':d=1, setpts=PTS-STARTPTS[top]; [1:v]setpts=PTS-STARTPTS+2/TB, scale=1920x1080, format=yuva420p,colorchannelmixer=aa=1.0[bottom]; [top][bottom]overlay=shortest=0" -vcodec libx264 out.mp4

  


  Is this achievable with ffmpeg ?

  


• save sequence of frame as BMP not PNG

  27 décembre 2013, par user2922938

  I extract 100 frames from video file and i save each frame as (.bmp) but i found that each frame format is PNG not BMP , how can I save sequence of frame (format as BMP not PNG as show in picture)in C# ?

  string name;            
  
  for ( int i = 0; i < 100; i++ )
  
  {
  
      Bitmap videoFrame = video.ReadVideoFrame( );  
  
      name = (i).ToString().PadLeft(5, '0');
  
      videoFrame.Save(@"D:\frames\" + name  + ".bmp");
  
      videoFrame.Dispose( );
  
  }
  
  
  
  video.Close( );
  
  MessageBox.Show(" Complete Convert video to sequence of image","Convert");