Question on speeding up a clip (slow motion to normal)

I have a slow-motion section (10x) and I want to play some of it at normal speed. If I just speed it up is it very jerky due to the short shutter speed (it was shot at 250fps and conformed to 25fps). What I want to do is speed it up by averaging groups of 10 frames (or better 5 then skip 5), so giving the "correct" shutter speed (well, a simulation of it). Is this possible in Resolve and if so how? Oh and note I'm learning Resolve and so not an expert by a long way, so the longer explanation would be appreciated, unless it's "No", which is fine on its own, although I'd then like to know where to leave an enhancement suggestion.

P.S. I'd also be interested in alternative suggestions on making it look less jerky after the speed-up.

...or maybe somebody could tell me if it's impossible and I should look elsewhere, that would be helpful too...

[Peter Chamberlain]

If you have the source clip change that to the speed you need.
You can review the manual in the Media Pool section look for "Clip Atributes", Frame rate.

If you dont have all the source, look into optical flow speed change.

To clarify (I think you understand all this):
The problem I have is if I just speed up the clip it looks super-jumpy due to the 1/250th shutter speed. What I want is to average 5-10 frames to give the impression of a 1/50th shutter speed.
I shot the video so have all the original material.
It was shot at 250fps, conformed to 25fps (10x slow motion).
It never existed as a 250fps file, was always written as 25fps.
Shutter speed 1/250th
Target is 10x speedup to make it normal speed (which I'm tagging on the end of all the slow-mos).
I don't have Premiere or After Effects (someone I was talking to yesterday suggested there was a very expensive plugin for the latter to do this).
I'm currently running 12.5.6 as 14.beta3 did horrible things to my Windows computer.

Note I am new to Resolve so quite a non-expert user (although a course during your recent event in London has helped considerably). What I did was edited four separate clips together into a slow-motion sequence. This involved no speed changes, just trimming, adding audio and doing transitions. I then rendered it into a video. I added that video to the media pool, added it to the end of the sequence (without the audio), changed the speed to 10x (Change Clip Speed -> 1000%) and added audio.

Are you suggesting if I added second copies of the clips to the media pool, changed the speed there and basically did the whole trimming/editing sequence again at the end of the video I wouldn't get the issue I'm seeing? (I avoided this as it was a lot of work.)

Many thanks for the reply.

So, what you actually want to do is frame averaging. AFAIK, Resolve has this only for temporal noise reduction. But did you give the artificial motion blur a try (under the Motion Effects palette) in Version 14?
The current beta does it quite nice for me.

The expensive plug-in you are referring to is RSMB, I suppose. It doesn't work well in DR, but if you have someone with After Effects around, give it a try. It has a watermark demo.

Thanks, that sounds interesting, but I'll have to work on the bravery a bit as last time with 14 wasn't good...

Well, I can only speak for the Mac and I have set up a fresh system for testing. Beta 8 runs fine for me.

It was beta 3 that caused me issues...

Okay, so 14 wants to install in the same dir 12.5.6 is in, does anyone know if I can just use a different directory and I can have both?

[Peter Chamberlain]

You can not have two versions of resolve in the system at the same time.

Im still not sure of your statement that it was shot at 250fps but you don't have that file. What frame rate is recorded on the camera? 250fps or 25?

Hi Peter,
I understand that it was shot at 250 fps, consequently with a short exposure time like 1/500th or, if adjusted, 1/250th. The file is now conformed to 25 fps and has not enough motion blur for his taste. So, he needs artificial motion blur or frame averaging.

The camera shoots 1080p at 250fps (or 500, 1000) into a RAM buffer, it then saves it to card at 25fps (optionally 50).
The camera is set to allow lengthening the shutter speed to 360 degrees if it helps at the light level. The metadata said it did that on these clips, so 1/250 not 1/500. Oh and only 3.8ms rolling shutter!

It's the same video twice, once at the speeds the camera saved the shots at (all 25fps) and once the video up to that point repeated but at 1000% speed in Resolve, which should be real-time (as it's saved at 10x slow-mo).
Hope that clears up any confusion.
Oh and no Ads as I just won my Copyright battle against someone who claimed to own the rights to some of the royalty-free music I used (and have licenses for).
It's really just a short, fun video, but I shoot slow-mo from time-to-time and so speeding it up is an issue I'd like to have a good solution to.
Oh and yes, as you really will wonder, the last bit is real-time! The 1000% part starts at 2:19:19 and the video length is 2:33:18 (so about 140 secs followed by 14 secs).