Choppy Video When Slowed Down

[Kayero5ED7]

Hi Community,

I have an unusual problem with my footage shot on a Sony FX3 when slowed down.

The video was shot in 4k at 60fps but when slowed down in a 24fps sequence, what I get is a weird jittery choppy result. This has never happened to me and I have shot videos using same camera a thousand times before without this issue.

What suddenly went wrong? It went from one day to the next and I haven't done anything I hadn't done before. In fact, I compare projects from the previous days to the new ones and I can't see what changed. Someone please help.

Cheers!

Kay

[Ishan Y]

Hey Kay,

Sorry about the issue. Could you let us know what is the clip speed and Time Interpolation set to? Is the playback choppy in the sense that it's skipping frames or does it seem like a preview rendering issue?

Thanks,

Ishan

[Kayero5ED7]

Thank you, Ishan for the response. So mostly I shot in 4k 60fps and 1080p 120fps. I slowed the 4k 60fps footage down to 40% using Frame Sampling. I tried Optical Flow and Frame Bending as well when I was constantly getting a choppy clip. Still the same result. However, when I slow down my 1080 clip by 20%, I get a desired smooth result.

I have reset my camera to its default factory settings about 3 times aready. I have changed memory cards. Nothing seems to point to the camera, so I thought maybe it's just Adobe.

[Kevin-Monahan]

Hi Kayero5ED7,

Sorry. May we have system info? There was a bug with optical flow speed effects on Mac not long ago. I recall that the footage looked rather stuttery after rendering it. Perhaps the bug has returned. Let us know.

Thanks,

Kevin

[Kayero5ED7]

Hello Kevin,

I have a Microsoft Windows 11 Pro. Version 21H2

System Name: MSI

System Model: Raider GE77HX 12UHS

System Type: 64-bit operating system, x64-based processor

Processor: 12th Gen Intel (R) i9-12900 HX, 2300Mhz, 16 Core(s), 24 Logical Processor(s)

Physical Memory (RAM): 64gb

I hope this is all the info you need.

Thank you,

Kay

[Sumeet Kumar Choubey]

Thanks for the details, Kay. Would you mind sharing a video showing the choppy preview that you are getting after doing Speed/Duration changes? Also, try interpreting the frame rate to 24fps for that 4k 60fps clip (right-click on the clip in the Project panel > Modify > Interpret Footage > set Assume this frame rate to 24fps) & then creating a new sequence from it to check if playing properly.

Thanks,

Sumeet

[Kayero5ED7]

Hi Sumeet,

Here is a short clip of the video after speed change to 40%. I also interpreted the footage and it doesn't seem to help any way.

[Christopher235378961brk]

I'm having this exact same issue, same camera as well.

[Jorsh304859130o9e]

I'm having this exact same issue 😞