ISO is a sector-by-sector copy of the data on an DVD disc. Both the file system and data are copied exactly as stored on the disc. In other words, an ISO image is identical to a disc, only without the physical disc. Before, many people would copy DVD to ISO images to protect them DVD discs. You also can get ISO files from the internet. But if you want to import ISO images to FCPX for editing, you won't be happy with ending cause FCPX doesn't support ISO images.
Fortunately, you can convert ISO to FCPX supported media format to load ISO images to FCPX for editing. Final Cut Pro X supports the following media formats: Apple Animation codec, Apple Intermediate codec, Apple ProRes (all versions), AVCHD (including AVCCAM, AVCHD Lite, and NXCAM), AVC-ULTRA (including AVC-LongG, AVC-Intra Class 50/100/200/4:4:4, and AVC-Intra LT), DV (including DVCAM, DVCPRO, and DVCPRO50), DVCPRO HD, H.264, etc. So you can transcode ISO to ProRes or H.264 video before edit ISO in FCPX.
Here, Pavtube ByteCopy for Mac is recommended to help you rip ISO format to Apple ProRes for FCP X/6/7 on Mac OS X (macOS Sierra included) within several clicks. What's more, besides ISO image, it also supports transcoding DVD/DVD folder, Blu-ray and Blu-ray folder into ProRes, H.264, etc for FCP X/6/7 and other NLEs, like iMovie, Avid, Premiere .etc. The solid ISO to Final Cut Pro converter trialware does a great job in ISO to FCP conversion, converting ISO to MP4/MOV super fast and 99% quality reserved.
Start to Convert ISO to FCPX
Step 1. Import ISO image files
Install and run the Mac DVD to FCP Converter to load the original ISO image. DVD disc/DVD folder as well as IFO files are also supported here.
Step 2. Choose Apple ProRes for FCPX
Clicking "Format" bar and choose Apple ProRes 422 (*.mov) as output format from the "Final Cut Pro" category which can be the most compatible video format for FCP. Learn>>Types of Apple ProRes Codecs.
Tip: FCP 7 and above user can choose ProRes 422(LT)/ProRes 444/ProRes 422(Proxy) to meet your own demands.
Step 3. Adjust video&audio settings (optional)
Click the “Settings” button to adjust video size, bitrate and frame rate if you are not satisfied with default settings.
Step 4. Start ISO to ProRes 422 LT Conversion.
Click the big red “Convert” to start converting ISO images to ProRes LT codec for FCPX. Ok, done!
Hit “Open” or “Open output folder” to find the converted ProRes LT, so you can import ISO movie to Final Cut Pro for further editing or projecting. Isn’t it easy?