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Deinterlace

Interlacing is the splitting of each frame of a video into two parts called fields. As you know, videos are made up of pixels. A 200 x 300 video has a width of 200 pixels and a height of 300 pixels.

In other words, the number of horizontal lines in the video is 300 and the number of vertical lines is 200. With the interlacing process, odd-numbered horizontal lines form one field, and even-numbered ones form another field. Deinterlace operation is the recovery of interlaced video from interlace mode.

Videos in Interlace mode can be annoying or even unplayable. That's why you can play interlace videos on DVD player, computer, etc. To watch with, we have to deinterlace.

Deinterlace

Important Points;

  • If you are going to deinterlace a video, deinterlace filters should always be the first filter applied to the video.
  • Make sure that the "Horizontal Deblocking" and "Vertical Deblocking" checkboxes are not selected by going to the Tools -> Preferences -> Video menu path.
  • You don't need to do this if the other filters and video codecs you use are set up correctly.

 The most commonly used deinterlacing filter for DVD video is Decomb Telecide. When you try to add this filter to the video, you must choose a strategy from the Strategy drop-down menu in the window that appears. If you select "No strategy", effectively all interlaced lines will be removed from the video and a beautiful picture will emerge. By default, the "No strategy" option is recommended, but other options are sometimes appropriate.

For NTSC frame rate (30fps);

If the source video is 29.97 fps (or 30 fps), and you want to keep that frame rate, all you need is to deinterlace the video with Decomb Telecide. You don't need to do anything else.

  • Add the Decomb Telecide filter first.
  • Set the Strategy option in the filter configuration to No Strategy. In this way, the video will be deinterlaced and the frame rate will not change.
  • You don't need to add the Decomb Decimate filter because you are not trying to reduce the framerate in the video.

To convert from NTSC to NTSC-film: Convert 30fps to 24fps;

If the source video is 29.97 fps (or 30 fps), and you want to convert this value to 23.976 fps (or 24 fps), do the following:

  • Add the Decomb Telecide filter first.
  • Set the Strategy option in the filter configuration to 3:2 Pulldown. This will deinterlace the video and prepare the frame rate to be 24fps, but not yet.
  • You should also lastly use the Decomb Decimate filter, this way the framerate reduction to 24 will do just fine. Simply use the default settings for Decomb Decimate.