I am not familiar with this particular camera but some Googling told me it records video as H.264/MPEG-4 which sounds fine for iMovie 10. However, is not in Apple's list of compatible cameras (http://help.apple.com/imovie/10/cameras/en/index.html?lang=en_US).
There are many sites trying to sell software to convert between video formats and my inclination is to be very skeptical whether what they offer is really needed. Even if it is, there is often free software available that will do the job.
View all photo and video thumbnail on Mac from Camera - Download photo or video files single or batch mode - Watch Camera Liveview video in the App - View all Camera Settings - Trigger Capture and view photo Support Cameras: All Nikon Camera with WiFi enabled, include D750, D850, D5300, D5500, D5600, Z6, Z7 and other WiFi models. HDMI Out Video Recorders. Another useful optional accessory that is often used on more professional video productions is the external recorder. With an external recorder such as an Atomos Ninja attached to a Nikon HD-SLR, you can record a higher quality, uncompressed video signal from the camera directly to the external recorder via HDMI. Is there any news about support of the new Nikon D5300 in FCP 6/7? I work on iMac, Mac OS X (Mavericks 10.9) MOV video format came from Nikon D5300 is a long GOP format that is highly compressed, it is not a good editing format.When you attempt to import Nikon D5300 videos to Final Cut Pro 6 or FCP 7 for some editing, you may find Final Cut Pro can not handle the H.264 MOV files natively. Nikon D5300 – Video Review – best DSLR video quality on APS-C (by Johnnie Behiri 14th February 2014) “Well, the title says it all. In terms of video quality Nikon just brought the best APS-C sensor VDSLR to the market. The video is sharp out of the box, yet it has a very nice organic look. Well done Nikon! Video Editing Software for Nikon D5300 MOV – Edit/Cut/Join D5300 Videos. Posted by admin on September 10, 2017 under Edit Nikon Videos Be the First to Comment “Video editing software: My new Nikon D5300 records video in MOV format. After a search of the webs, it appears video software that works with MOV format is difficult to find.
iMovie probably doesn't recognise your camera for direct camera import (else it would be in the list) but you say that you can drag clips from the camera into events*. If they play OK then I see no need to do any pre-conversion. iMovie itself will convert clips to AIC and imovie 10 does this in the background so you no longer have to wait before you can do any editing.
* I never use the iMovie import function (even though my camera is supported), but I simply connect the camera or the SD card as an external volume then drag and drop files straight into a project timeline (they go into the event automatically). I usually only want to read a few video clips from the last shoot and see no advantage in waiting for iMovie to display thumbnails of all the clips on the card. When full I keep the SD cards as a backup.