Re: Downconvert 720p 23.98 to 29.97 Betacam Problem

[Bill Paris] "do you see the 23.98 motion artifacts diminish after running the 2:3:2:3 conversion in combination with the interlaced SD playback? "

Can you explain what you mean here? 23.98 is 23.98 and when you add pulldown, you still have 23.98 motion with a few interlaced fields thrown in to conform the frame rate to 29.97. It doesn't smooth out the motion as you would if you shot 29.97 from the get-go. Is that what you mean? If you don't work in 23.98 that much, you will get used to the motion. Going back to base 30 video is quite a shock sometimes.


[Bill Paris] "Thanks for your help, I'm a little confused about why the 59.94 rate works with the 23.98 source, but I'll take the results for now and figure out the rest later..... thanks again! "

Well, I could tell you, but that would require me sending you an invoice, a thorough credit background check of you and your business, and a nice cup of hot coffee, the good kind.

Just kidding!

Very simply, 720p23.98 is a format that is understood by our computers. It is an 'intermediate' format that is stored as 23.98 data. In order to play out 23.98 to most monitors in real time, it has to be conformed to 59.94 (60p) for SMPTE and their rules/standards. So, when you have 23.98 material at a 720p resolution the material gets played out @ 59.94 with standard 3:2 pulldown, although the pulldown is in full frames and not fields. So you have 3 full duplicate frames, then 2 full duplicate frames repeated over and over. This will bring your video to 720p59.94. From there, since you are now at a base 30 frame rate, you can down convert or cross convert to 525i or 1080i. Does that make sense? ALso, when your video is 720p23.98, the Kona cards can take the 23.98 signal and cross convert to 1080p(sf)24 as well as 1080i 29.97 (24p with 3:2 pulldown)

Hope that helps.

Jeremy