best method for changing clip speed?

My timeline setting is 29,97fps - my clips are recorded at 59,94fps.

When I drag a clip to my timeline it plays correctly at actual speed but with 29,97fps according to timeline settings and clip attributes show 59,94fps.

When I change the clip attributes in the media pool from 59,94fps to 29,97fps and then drag it into my (30fps) timeline it plays (correctly) at half speed. The clip attributes show 29,97fps.

However, if I drag the 59,94fps clip into my 29,97fps timeline and try to change the speed via "change clip speed" function to 50%, the funktion window indicates a change from 30fps to 15fps - it plays correctly at half speed (clip attributes still show 59,94fps)

So - which method gives the better result or is it the same but just the fps in the clip change function is wrong? And - when changing the attributes framerate do I click Dropframe on or off for best results?

I would use Clip Attributes method.

To answer your question. If the speed interpolation is set to "nearest" then the results are the same.

However, you incorrectly refer to 59.94 fps playing offspeed as "correctly" when you use the clip attributes to 29.97.

To explain... if you shoot something at 59.94 fps then it is correct for Resolve to interpret that from 59.94 to 29.97 in your example AND preserve the "realtime" normal looking motion. It's a different kettle of fish if you shoot on a camera (eg F55 using S&Q or RED using their offspeed workflow) where the recorded footage is captured at, say, 120fps but is flagged for playback at 25fps. Then you would expect slow motion.

I hope this makes sense. Some cameras are designed for offspeed shooting. Some shoot at a higher frame rate than your destination framerate but are not flagging their footage to be played back at your destination frame rate (eg a7s)

Paul

In this case you'd get super-smooth slomo