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alistairc23206244
alistairc23206244
Known Participant
December 30, 2016
Question

60fps video mixed with 24fps video - help!

  • December 30, 2016
  • 1 reply
  • 36460 views

Hi all,

I know that this has been asked possibly many times before, but I simply cannot find a solution to this. I'm getting jerky-looking (or incorrectly playing) 60fps video on my project timeline...

I have a timeline with a mixture of 24fps clips and 60fps clips. Now, the 60fps clips are definitely recognised as being 60fps by Premiere (so it tells me in the clip properties) but when I go to "sequence" and click on "sequence settings" it's telling me the timebase is 24fps.

As a test I created a new project and just pulled in one of my 60fps files and I checked the "sequence settings" and it said the timebase was 60fps. It played perfectly and smoothly.

So something is not right in my project and I don't know what it is...the 60fps video are a bit jerky on the timeline so I don't know what is going on.

There must be a way to seemlessly use both 60fps and other frame rates in one project, but obviously I am doing something wrong.

Thank you in advance.

Al.

This topic has been closed for replies.

1 reply

E
excited_Genie16B8
Legend
December 30, 2016

There must be a way to seemlessly use both 60fps and other frame rates in one project

There is.  The 24 fps material will play back in real time, the 60 fps material needs to be Modified to play back at 24 fps so it's in slow motion.

Right click the 60 fps clips in the bin and select Modify>Interpret Footage... and set the frame rate to match the other footage.

    alistairc23206244
    alistairc23206244Author
    Known Participant
    December 30, 2016

    Hi Jim,

    Thank you for your reply.

    The 60fps footage is already in slow motion. It's as it should be. The video file is literally ready to go without any modification needed to make it look "right".

    I assumed, perhaps incorrectly, that Premiere would read its frame rate and simply adopt whatever settings it had.

    As I said above, if I create a new project and drag on a 60fps video on to the timeline, it plays as it should. But within my project, which has a mix of 60fps video and 25fps video it is causing the 60fps footage to look ever-so-slightly jerky (I can only compare the way it plays the 60fps footage as if the computer is processing a task and it's slowing down the video, but this is not the case).

    There is something that I've missed somewhere....a setting or an option. Either that or Adobe Premiere Pro is actually quite useless and can't handle different frame rates on the same timeline (which I'm beginning to think is the case!!!)

    alistairc23206244
    alistairc23206244Author
    Known Participant
    December 31, 2016

    When you are mixing frame rates - without either conforming or adjusting playback speed - you are either repeating frames (25fps to 60 fps) or deleting frames (60 fps to 25 fps). The cadence at which these repetitions or deletions occur is critical to the apparent smoothness of motion of the result. Smoother cadence is possible when the two frame rate ratios have a usable common denominator and not when they don't.

    If you had been using a regular video clip instead of a time-lapse clip, this would likely have been more obvious.

    MtD


    Very helpful, thank you very much!

    So, if I've got this right: Do you think it's best, in future, if I export at 24fps when the intention is to use this 24fps footage along with 60fps footage?

    Another option, which I would need to experiment with, is to export the final slow-motion video as 60fps normal speed in DaVinci Resolve (i.e, so that it looks fast-speed), and then reduce the frame rate in Premiere to 24 so that it would result in a slow-motion video on the 24fps timeline. Would that work?

    Under what circumstances would anyone shoot 30fps? I'm not sure I really understand the 30fps thing.

    Apologies for the questions and thank you for your patience. I have found it difficult (other than this forum) to find a coherent explanation for frame rates (plus, it's always better to chat to people who know their stuff!).

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