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• Can FFmpeg perform audio phase subtraction ? [closed]

  22 avril 2023, par Calarpo

  I can do audio phase subtraction in Adobe Audition like so : https://www.youtube.com/watch?v=vNvJKBg3yds

  


  How can I do this with FFmpeg ? Is it possible ?

  


  I've googled for audio phase subtraction, and looked at https://ffmpeg.org/ffmpeg-filters.html, nothing seems to work for me.

  


  I want to do phase subtraction in batches and support for stereo audio.

  


• Increasing speed of a video in C# ?

  13 décembre 2017, par alan samuel

  I am trying to increase the speed of a video using NReco.VideoConverter.FFMpegConverter

  Here is what I have tried.

    var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
    string inputfile = @"C:\Users\Alan\Desktop\Video.flv";
  
    string outputfile = @"C:\Users\Alan\Desktop\converted.mp4";
  
  
  
  
  
    ConvertSettings convertSettings = new ConvertSettings
  
          {
  
              MaxDuration = 10,
  
              VideoFrameRate = 12
  
              //VideoFrameCount = 10
  
  
  
          };
  
  
  
  ffMpeg.ConvertMedia(inputfile,Format.flv, outputfile,Format.mp4,convertSettings);

  What I want is like a video with an increased playback like in this example - https://www.youtube.com/watch?v=6tQ1ewhGiwk

  This is what I am basically trying to do.

• Compression of a video with constant background

  28 juin 2017, par Spirou003

  (sorry if my english is bad, I can read it but I don’t write it quite well...)

  I want to compress some videos, which have two particularities :

  • there is a background that covers 90% of the area, during the whole video
  • most of the others elements can be separately described by a picture in move

  My videos are like this one, and don’t have audio. As you can see, almost everything can be described only by using a fixed background, few small images in move, plus a noise. Moreover, this noise will be almost nul and then an entropic coding would be very efficient. I think it will produce tiny files (< 5 Mo) even if the duration is in hours, a result that is very appreciable since I have actually recorded 30h of game (actual size is 3 Go).

  Is there any way to get new video files, that benefit of these informations ? If yes, what are the implication of a such encoding for watching these videos with Windows Media Player, or for usage with ffmpeg ?

  I searched with Google after anything that can help me, but I don’t know which keyword I can use for this, then I didn’t found anything usefull :-(

  Thanks in advance :-)

  PS : another example, the video is accelerated but shows the interesting moves