View Full Version : 24p and Speed Adjustment
02-02-2004, 08:59 AM
I recently edited some 24p progressive footage in which I slowed the speed to something around 10 or 20%. I noticed that there were a certain number of frames that repeated themselves, thus, causing a stop and start jump in the shot. I understand this has to do with the pulldown from the 24p. To fix the problem, I ended up cutting out the places where the frames repeated themselves...seemed like unnecessary work. If I shoot 30p will this solve this problem? If not, at what speed will 30p have noticeable start and stops?
02-02-2004, 09:07 AM
unless you are using some sort of frame interpolation software to make new frames to perform the slowdown, the frames have to reapet themsleves. *you only have 24 frames to work with in one sec, if you stretch those 24 frames over 5 secs, they will have to reapeat to keep each sec still using 24 frames per sec. 30p isnt going to make a difference. frames will still repeat just 20% less.. try using twixtor or re timer or motionperfect opr timemaster 2.0 to generate new frames interpolated between the old frames to create a new smooth 20% speed clip at 24 fps.
you can use 30p to put into a 24 p timeline, and stretch the 30 clip over 30 frames in the 24p timeline, and it will slow the clip down, but only 20%..its a good start of your doing slow moition, because theres no repeated frames, and you can go slower from there with the above mentioned software.
02-02-2004, 09:43 AM
I understand the issue with slowing the 24p down and having repeated frames. This instance, I slowed the speed from 100% down to 5%--now that I look back on what I did. The effect of the blurred frames was something that actually looked good for what I was using it for, but there were areas in the clip that had more repeated frames than usuall...I think it happened maybe five or six times over a five second period when slowed to 5%. I'm wondering if I can get a more consistent pull down with 30p so these longer stretches of repeated frames don't happen.
Thanks for the info for that slow-mo software. Does it really look that much better?
02-02-2004, 09:49 AM
just watch the top 3 examples click on the pics
this is just twixtor.. twixor and retimer ar ethe most powerful of the group.. motionperfect, and timemaster 2.0 are cheap but ok solutions that do the same thing, but with not nearly as much control.
02-02-2004, 10:58 AM
Wow, that's some really powerful software. Do you think Twixtor is the best? I'm definately going to have to invest in one of these packages.
02-02-2004, 11:02 AM
well.. twixtor as you can see has been the choice of major motion picture studios , but retimer is also pretty snazzy , and has been used on one major picture that im aware of --"enemy at the gates" for slowing some smoke down.. other than that i would go with twixtor.. i do think its the best.. but i ve never used retimer. so i couldnt say for sure.. i havent found a demo yet of it .. if you find on let me know :)
02-03-2004, 07:38 AM
Boris Red's 'Optical Flow' is another sweet one that you have to check out. Here's the link:
from there scroll down to the section 'Optical Flow Technology'.
Hope this helps.
02-03-2004, 08:59 AM
Cool. How do I know which one is better? Is Boris Red's a complete package, or was this entire web page separate plug-ins? I'm concerned with getting a program that has a long learning curve, but I can see the benifit of having additional functions that I would probably use.
02-03-2004, 04:33 PM
Red's a complete package of which the 'Optical Flow' effect is one of many. Not sure how to speak as to the learning curve since I'm not sure of your background. But if you have a pretty good feel of working with video, whether it be in an NLE, After Effects, etc. you should be OK.
Red is recommended by some pretty serious folks over at the 'Cow.