Taran, Idon't understand :my keyframes use linerar spatial interpolation by default and not auto bezier. My config: Windows 10 Pro v 1709 (10.0.16299 ) uptodate 2018-04 Core i7-3930K/3.20 GHz 12MB 64Bit ASUS NVDIA GeForce GTX 680 2Go v 391.35 03/27/2018 64Go RAM DDR3 Premiere pro v 12.1.0 (Build 186) French
Amen! I was promised a "JDI update" ("Just Do It" in Adobe developer lingo) to get this feature added to Premiere at NAB 2018. A year later, it's still one of the issues that drives me the farthest up the wall. A checkmark to set the default spatial interpolation to linear in the preferences like After Effects would solve soooo many headaches and save all the time I currently spend highlighting the position keyframes in every edit and switching them to linear.
Premiere keyframes jump from Linear to Auto Bezier. I don't know when and why exactly, but when editing keyframes, moving them around or creating new keyframes in between other ones, one or more Position Keyframes, via spacial interpolation, is changed from linear to Auto Bezier. I have spent many hours trying to get rid of the unwanted movements before I understood what was going on! This is a big flaw, borderline bug. It should be fixed a long time ago.
Sorry for being four years late but you can just mass-select all the keyframes in a clip with the help of your mouse and then right-click and apply linear spatial interpolation to them all.
Thanks Denys for the info, but some of us have hundreds of clips in each project and having to do that every time is a lot of time. I'm not sure why this issue has not been addressed with a simple checkbox or dropdown menu.