In order to solve this problem, I specially checked the compatible formats with some NLEs including FCP, indeed the AVI is not among them. So if you want to edit 4K AVI in NLEs or other usages, you'd better convert 4K AVI to Apple Prores which is fiendly with editing softwares like FCP 6/7/X, Adobe Premiere Pro, or DaVinci Resolve, etc.
You are highly recommended transcoding 4K AVI to Apple ProRes codec with one top 4K video converter - iFastime Video Converter Ultimate. This app can re-encode 4K AVI, all 4K, 2K, HD and SD videos (including camera/camcorder footage) and rip DVD, Blu-ray to Apple ProRes for editing programs like FCP 6/7, FCP X, Adobe Premiere Pro, as well as create optimized files for viewing on iOS, Android devices, HDTVs, HD players, and more.
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Steps to Convert 4K AVI to Apple ProRes on Windows
Step 1. Load 4K AVI files to the program
Click the "File" to the top menu bar to import 4K AVI files to the program. You can choose several files into this program at the same time.
Step 2. Choose Apple ProRes 422 format
Click "Format" > "Final Cut Pro" > "Apple ProRes 422 (*.mov)". You can select one as target format depending on your request in post production.
Tips: Click the "Settings" button and customize proper video/audio parameters including Video size, bitrate and fame rate and more. Please remember the file size is based more on bitrate than resolution which means higher bitrate results in bigger file size, and lower visible quality loss.
Step 3: Start to backup 4K AVI to ProRes
After all the settings done, the last thing is to click the "Start conversion" button at the bottom right corner to start to backup 4K AVI to ProRes.
See, it is so easy to get 4K AVI to ProRes format with iFastime Video Converter Ultimate. Just have a try.
Have more questions about how to convert 4K AVI to Apple Prores on Windows, please feel free to contact us>> or leave a message at Facebook.