Convert60ito24p

Abstract
Author	scharfis_brain
Version
Download	convert60ito24p.avs [1]
Category	Frame Rate Converters
License
Discussion	Doom9 Thread

Description

This function converts 60fps video into 24fps avoiding jerky motion.

• Note: this method is rather old (2003), better alternatives are available.

Requirements

• AviSynth 2.5.8 or later
• Progressive input only
• Supported color formats: RGB24, RGB32, YUY2

Syntax and Parameters

convert60ito24p (clip video, int mode, int offset)

clip  video =

Input clip.

int  mode =

Mode 0 does a simple 2 out of 5 selection, which results in jerky motion. Use this mode for comparing purposes.

Modes 1 to 3 are using blending of nearby Frames to avoid jerkyness and "simulate" motionblur. The higher the mode-number the more motionblur will be made and thus the motion gets smoother. Modes 2 and 3 are only recommended with a shutterspeed of 1/60sec. With shorter shutter speeds use Mode 1.

• mode=0 : uses simple 24 out of 60 selection -> jerky motion.

 
 A B C D E F G H I J K L M N O P Q R  <- input sequence
   |     |   |     |   |     |   |    <- | = direct copy
   1    2    3    4    5    6    7    <- resulting output sequence

• mode=1 : introduces a blending of every other frame from its nearest neighbors. This mode delivers a non-jerky motion and should be used with shutter speeds below 1/60sec! ie. 1/120 or shorter.

 
 A B C D E F G H I J K L M N O P Q R  <- input sequence
   |   \ /   |   \ /   |   \ /   |    <- | = direct copy ; \ / = 50:50 blending
   1    2    3    4    5    6    7    <- resulting output sequence

• mode=2 : uses blending on every frame, ideal for shutter speed of 1/60 sec since it simulates very close the 24p (1/24sec) motion blur and thus giving a really smooth 24p - motion as a positive side-effect, this mode reduces noise and nearly completely eliminates remained line flickering of the deinterlacing!

 
A B C D E F G H I J K L M N O P Q R   <- input sequence
  \|/  \ /  \|/  \ /  \|/  \ /  \|/   <- \|/ = 25:50:25 blending ; \ / = 50:50 blending
   1    2    3    4    5    6    7    <- resulting output sequence

• mode=3 : similar to mode 2 but with more motion blur.
• Any other number given to mode just returns the original (60fps) input clip.

int  offset =

Apply an offset for selecting the 2 out of 5 frames - pattern.

Examples

Import("convert60ito24p.avs")

AviSource("blah.avi")
QTGMC() # or any other double frame rate deinterlacer
convert60ito24p(2,0)

External Links

• Doom9 Forum - Convert60ito24p discussion.
• scharfis_brain's website[2] - Convert60ito24p webpage.

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