can someone explain 3:2 pulldown?

[BlahBlahYouToo]

where are these numbers coming from?
what does it have to do wit 24/60/120 frames/hz?

 

[CalvinHobbes]

http://www.dvdfile.com/news/sp...n_a_z/3_2_pulldown.htm

 

[Quasmo]

Films are shot at 24 frames a second. TV is generally displayed at 30fps. for every 3 frames 2 are used and one is a duplicated frame. In 3:2 pulldown, the duplicate frame is removed. IE 6 frames a second to make a 24 frame movie fit into the 30 fps signal.

 

[krotchy]

3:2 is shown in the article

5:5 pulldown = show each full progressive frame 5 times in a row then change. Only relevant to 120Hz refresh rate TV's
3:3 pulldown = show each full progressive frame 3 times in a row then change. Only relevant to 72Hz plasma TV's. Essentially they are sped up to 72Hz from 60Hz to get an exact multiple of 24.


Other options:

10:10 Pulldown - Same concept as 3:3/5:5 except for 240Hz TV's. Coming soon on DLP's

120Hz motion processing (Manufacturer names include Auto Motion Plus, Digital Drystal Clear etc.) - An analysis is done between the current frame and the next frame in the series. Object detection is done and an attempt to find the movement of each thing on the screen as it correlates to the previous frame is run. It then generates 4 interpolated frames which try to draw the objects that have moved between the 2 frames in their intermitant state. The 4 interpolated frames are inserted between each of the 24 real frames to give you a smoother image. This can give a "Soap Opera" look to some films.

Example:

Frame A: -..........
Frame B: ..........-

With 120hz Motion Processing:
Frame A: -..........
Frame 1: ..-........
Frame 2: ....-......
Frame 3: ......-....
Frame 4: ........-..
Frame B: ..........-

 

[BlahBlahYouToo]

so are these functions of the DVD player or the TV? or either?

 

[krotchy]

Originally posted by: BlahBlahYouToo
so are these functions of the DVD player or the TV? or either?

Depends.

Say you have an upconverting DVD player which can do proggresive or interlaced output. (480p,720p,1080i,1080p)

If you choose to output 1080i the TV will do 3:2 pulldown.

If you choose XXXXp 60hz as the output, the DVD player will be doing the 3:2 pulldown internally and outputting it as a progressive stream.

If you choose XXXXp 24Hz for the output then the TV now has a bunch of options. It can now attempt any pulldown mechanism I mentioned above or some other obscure scheme up to the manufacturer.

IMO the best image you can get is with a player set to 1080p24 output, with any 1 ratio pulldown (3:3,5:5,10:10), and sometimes this can be improved with a motion processor, but it depends on the TV as all the manufacturers differ.