Does field matched telecine materal look the same as field matched+decimated?

[anonova]

with hard telecine matieral, I would like to know if tfm() (producing a 30 fps video) looks the same as tfm().tdecimate() (producing a 24 fps video). is fluidity different between the two? six frames are displayed for 2/30 of a second with just field matching, but is this enough to produce nonsmooth results?

[neuron2]

is this enough to produce nonsmooth results? Yes, it is called "telecine judder".

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2005-08,GGLD:en&q=telecine+judder

[Yoshiyuki Blade]

Yeah, its definitely noticeable. A good example where this causes problems is the credits sequence of some TV shows with footage in the background. The scrolling text could be purely interlaced at 30i (for smoother scrolling) while the background is 24p telecined to 30i. IVTCing could probably restore the background footage back to its original 24 fps, but the scrolling credits will exhibit that judder (since they were not originally 24 fps).

[anonova]

thanks. i didn't know there was a particular name for it.

[Leak]

Well, if you happen to be comparing a telecined source before and after IVTCing it on a display with 60 Hz refresh rate I doubt you'll see much difference in smoothness (well, except for the need for deinterlacing with the original, obviously) since the renderer has to display some frames twice and some three times in a row to show the 24 FPS video at 60 Hz, adding the removed judder right back.

Try comparing a telecined source at 60 Hz with the IVTCed result at 48 or 72 Hz - that should make the difference obvious... :)

np: Underworld & Gabriel Yared - Will And Amira (Breaking & Entering OST)