Participant

Question

Help needed with framerates (mainly used 50fps, 30fps)

Forum|Forum|6 years ago
November 24, 2019
4 replies
13962 views

Hi all,

Im an beginner hobby filmmaker. Me and husband filmed our Maui honeymoon mainly with gopro (30fps) and his Canon camera (50fps). Now in the holiday video I want the clips to be a bit slow mo but not like all 50fps clips played back at half speed which happens if i convert 50fps to 25fps.

I figured i will create the sequence at 25fps, the 30fps clips i can covert to 25fps giving it a nice smooth slight slow mo. When I convert 50fps to 25fps for some clips this half speed playback is ok for others i want to be equivalent speed to those which I converted from 30 to 25.

Question is :after converting 50fps to 25fps can i manually speed up clip by changing the speed or it makes the clip look crap? To what number do i change the 100%speed to in order to match the speed of those 30fps clips which i converted to 25fps.

Sorry if the explanation was a bit difficult to understand, hopefully somebody will still be able to help me out.

Thanks a lot:)

How to

This topic has been closed for replies.

Ann Bens

Community Expert

You need to experiment. As said before mixing pal and ntsc framerates is a pita. I know from experience.

Test different scenarios and see what looks best.

Ann Bens

Community Expert

As this is your first project i would keep it simple. Dont go converting or intepreting.

Drop everything in a 25 fps timeline. All clips will play at normal speed.

Just make the speed changes on the timeline.

W

Whispering_day5D2FAuthor

Participant

Hi,

But earlier commenter suggested that timeline and export should be set
according to the framerate that is highest among the clips used, i.e if
half clips are 50fps, half are 30fps he suggested sequence/ timeline should
be also 50fps, same as export..

So how will the quality be highest?

Ann Bens

Community Expert

You have mixed framerate and you have mixed framerates.

The first is either 24, 30 and 60 (so called NTSC) or 25 and 50 (so called PAL)

The second one is a pita mixing NTSC with PAL (looks ok on the timeline until you export).

I would convert the 30 to 25 before bringing it into Pr.

What is the end product going to be: Youtube, thumbdrive, ........?

Next time you want to use the GoPro set it to PAL either 25 or 50 fps.

W

Whispering_day5D2FAuthor

Participant

Hi,

End product will be youtube video, i must be honest with you I didnt
understand at all what I would need to do now:((

Averdahl

Community Expert

Don´t convert any clips.

Select the clip on the timeline and press Ctrl+R/Command+R and change the speed in the Clip Speed / Duration dialog. Using this on a 50fps clip and change the speed from 100% to 50% and then change the Time Interpolation to Optical Flow will give you a nice slomo.

By doing this you can, if you change your mind, set it back to 100% and still get highest quality. You do not have that option if you convert your clips from 50fps to 25fps and the try to speed up the 25fps clip back to 50fps.

EDIT:

If i had the same footage i would edit it on a Timeline set to 50fps and then export to 50fps. If you edit 50fps footage on a 25fps or 30fps timeline you will get much stutter in the footage when exporting due to skipping frames.

W

Whispering_day5D2FAuthor

Participant

Hi there, thanks for the answer, however if the sequence is 50fps and i export it as 50fps, what will happen to those 30fps clips which i drop to the sequence and also export at 50fps if i converted them to 25fps i would get nice slow mo without using quality if sequence/ export was also at 25fps, or am I misunderstanding everything?..i thought sequence/ export always needs to have smaller fps than the clips you use and not the other way round.

Averdahl

Community Expert

You will get a great slomo.

If you place a 50fps clip on a 25fps sequence and export it as 25fps 50% of the frames in the 50fps source clip will be skipped and cause stuttery motion. Try it on a clip with much motion in the video, such as a camera pan in the 50fps source footage on a 50fps timeline exported as 50fps will give you a smooth pan while 50fps source footage on a 25fps (or 30fps) timeline exported as 25fps will not. Try it and see the difference.

Always aim for the highest frame rate on your timeline when using mixed frame rates. You have 50fps as your highest and that should be the frame rate of your timeline for the best result. Having 30fps footage on a 50 fps timeline will work perfect. Having 50fps footage on a 30fps timeline will shave off 20 frames/second from you 50fps footage. It will not look good. Forget about exporting it to 25fps unless you are going to do a Blu-ray or DVD.

The best way is to try and see for your self. 🙂

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