B_Trebor
Level 1 (0 points)

Q: gopro 120 fps for slo-mo

I want to make sure I understand how FCPX 10.2.1 handles overcranked film recorded at 120fps to create slo-mo.

 

Here is the basic workflow as I understand it...

1. I import the film into FCPX---it shows in my library

2. I move a clip to my timeline---my timeline is set to 29.97 fps or some other acceptable/supported frame rate (60 or below) for my final movie

3. I select the retime percentage I want to slow the video to

4. I perform what ever other edits I want and then export the final movie

 

My questions are these....

1. When I move the 120fps clip to the 29.97 fps timeline does this drop frames from the original film to conform to the lower fps timeline? Or does the dropping of frames only happen at export time (if frames need to be dropped)?

2. When I slow the video shown in the 29.97 fps timeline via retime, will it utilize the frames obtained in the original 120fps film? Or does FCPX make up frames to create the slo-mo?

3. If I slow a clip in the timeline to a percentage below what the original film's available frames per second can support naturally, is that when FCPX will add filler/fake frames to create the slo-mo?

 

Just wanting to make sure I understand how FCP is creating the edits in the background.

 

Thanks,

-Robert

MacBook Pro, Mac OS X (10.5.1)

Posted on Jan 22, 2016 6:30 PM

by Tom Wolsky,Solvedanswer
Tom Wolsky Tom Wolsky
Level 10 (118,152 points)
Apple TV
A:
is the only way to utilize the overcranked frames to use automatic speed?

It's the best way to see what your video will look like.

 

If I just place the clip at 50% via retime with out using automatic speed will it take advantage of the extra frames in the overcranked original clip?

 

Yes.

 

In 10.2.1, what does FCP do if I reduce the speed to say 20%? Does it start adding duplicate frames to extend the clip?

 

Use either frame blending or optical flow. The Help guide explains how to use these functions.

Posted on Jan 23, 2016 4:33 AM

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B_Trebor

Q: gopro 120 fps for slo-mo

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  • Helpful answers

  • by Tom Wolsky,

    Tom Wolsky Tom Wolsky Jan 22, 2016 6:36 PM in response to B_Trebor
    Level 10 (118,152 points)
    Apple TV
    Jan 22, 2016 6:36 PM in response to B_Trebor

    Put the clip in the timeline and in the retiming menu select automatic speed. That sets frame for frame playback to give you slomo. Then use the retiming bar to adjust the speed to whatever you want.

  • by B_Trebor,

    B_Trebor B_Trebor Jan 23, 2016 2:56 AM in response to Tom Wolsky
    Level 1 (0 points)
    Jan 23, 2016 2:56 AM in response to Tom Wolsky

    is the only way to utilize the overcranked frames to use automatic speed? If I shoot the film at 120 fps---automatic speed will place the clip at 25% in the timeline. If I just place the clip at 50% via retime with out using automatic speed will it take advantage of the extra frames in the overcranked original clip? In 10.2.1, what does FCP do if I reduce the speed to say 20%? Does it start adding duplicate frames to extend the clip?


    Thanks for your help in my understanding this.

  • by Tom Wolsky,Solvedanswer

    Tom Wolsky Tom Wolsky Jan 23, 2016 4:33 AM in response to B_Trebor
    Level 10 (118,152 points)
    Apple TV
    Jan 23, 2016 4:33 AM in response to B_Trebor
    is the only way to utilize the overcranked frames to use automatic speed?

    It's the best way to see what your video will look like.

     

    If I just place the clip at 50% via retime with out using automatic speed will it take advantage of the extra frames in the overcranked original clip?

     

    Yes.

     

    In 10.2.1, what does FCP do if I reduce the speed to say 20%? Does it start adding duplicate frames to extend the clip?

     

    Use either frame blending or optical flow. The Help guide explains how to use these functions.