This is (yet another) port of a filter by Donal Graft. Its aim is to remove combing, including inverse telecine. Note that it does not alter framerate. It merely deinterlaces the video, which can result in more frames than you need, depending on your video source and your desired output framerate.

For DVD sources specifically, this filter is strongly recommended instead of most others. Decomb is the “default” Inverse Telecine (IVTC) for many video encoding programs, including Gordian Knot and Avidemux. It is the only filter that can handle all possible combinations of frame reconstruction, decimation and deinterlacing.

If results are not satisfactory, you may wish to look at the filter Yadif which is also an excellent deinterlacer, though not as well adapted for true DVD Telecine video.

If the source video is 29.97 fps (or 30 fps), and you want to keep that framerate, then all you need to do is deinterlace the video with Decomb Telecide and nothing else.

• First add the Decomb Telecide filter.
• For the filter configuration option Strategy select No Strategy. This will only deinterlace the video and leave the framerate unaltered.
• You do NOT need to use Decomb Decimate because you are not trying to reduce the number of frames in the video.

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

• First add the Decomb Telecide filter.
• For the filter configuration option Strategy select 3:2 Pulldown. This will deinterlace the video and prepare framerate to be properly 24 fps, but it does not actually do it.
• You MUST also use Decomb Decimate after the Decomb Telecide to get the proper number of frames for 24 fps. Using the default options Decomb Decimate are normally good enough. This will reduce the number of frames in the video to approximately 24 fps.