I was shooting in 120fps super slow motion but file is at 24fps

[geoffroys62197371]

I was shooting fast-paced scenes (sport) in super slow motion (120fps) with the Panasonic HC-X1.   The resulting file once exported to the PC is at 24fps (23.98)  It plays in super slow motion as intended but I can't use SPEED DURATION in Premiere Pro CC 2018 (12.01)  to increase the speed (5 times) as it will stretch the timeline (duration is locked)

Working with shots in super slow motion is not something I'm very familiar with so I guess there is something I should be aware of... but I can't figure it out. 

Any help would be appreciated.

Thank you

[excited_Genie16B8]

You filmed in slow motion.  The point is to see it in slow motion.  It's playing in slow motion.

You're job is done.  Why are you still messing with the speed?

[geoffroys62197371]

I want to combine normal speed and super slow motion.  I can do it at 60fps in 4k.  But as you know it's even better when the sequence at normal speed is suddenly slowed down at 120fps (HD) 

Thanks

[Byron Cortez · Accepted solution]

Hi geoffroys, you have an easy solution:

In Project panel right click in video, choose Modify / Interpret Footage...

In "Assume this frame rate:" box, put 120 fps like the screenshot, and that's all.

Regards!

[geoffroys62197371]

Thank you very much

[Byron Cortez]

You’re welcome!