Summary: Final Cut Pro X can't support MKV files importing. To edit MKV video in FCP X smoothly, the easy workaround is to convert MKV to ProRes, which ensures best results when using FCP X. Here is how-to.
We usually saw Final Cut users encounter importing issues when attempting to edit 1080p/720p HD MKV files with Final Cut Pro X. Let's see some frequently asked questions on this.
Q1: how I can use mkv video in final cut pro x
I've some videos in .mkv extension and i'd like to edit some scene in final cut x studio.
Is it possible? How to?
Q2: Can final cut pro x (FCPX) edit MKV movie files?
“I have a 1080p MKV file I want to get into Final Cut Pro X. I know MKV won't work in FCP X and that it needs to be converted to something friendlier like ProRes. Right now I'm converting the MKV using Perian in Quicktime but it's taking an extremely long time: it's been 15 hours and it's only halfway through. I was wondering if there was something like that available for MKV files so I don't have to re-encode. Any suggestions?”
Wanna to import MKV files to Final Cut Pro X for editing but FCP X doesn't let you do it? Final Cut Pro is famous for its powerful editing features. Unfortunately, MKV is not supported by FCP X. To get MKV files and Final Cut Pro X to work beautifully, the easy workaround is to transcode MKV to Apple ProRes, which ensures maximum editing quality and efficiency when working with Final Cut Pro X. Along with some help from professional MKV to ProRes Converter, it can be done. To help those who wanna edit HD MKV (H.264) files and SD MKV files in Final Cut Pro X, here I share with you a simple guide on how to convert MKV to Apple ProRes MOV format for FCP X.
First of all, download the app - Brorsoft Video Converter for Mac
Overall, the program is a professional yet all-in-one video conversion tool. With it, you can easily rewrap all MKV files to ProRes 422, ProRes 422 HQ or 4444 for using in Final Cut Pro X/7/6. It also provides simple video editing functions for you. Besides, the Mac video converter can convert HD videos from HD camcorders or DVs (like JVC, Panasonic, Sony and Cannon) for editing in Final Cut Pro, Final Cut Pro X, Final Cut Express, iMovie, Avid MC, Adobe Premiere Pro etc. Just download it and follow the tutorial below to get the work done.
Guide: Transcoding MKV to Apple ProRes for Final Cut Pro X
Step 1: Launch the Mac ProRes Conversion program; click "Add" button from main menu to browse your computer hard drive and select the MKV files you want to convert. Or you can easily drag-and-drop files into this application for converting. You can also load video files formatted in .avi, .wmv, .flv, .vob, etc.
Tip: You can check the “Merge into one” box to merge several MKV video files together for easier editing.
Step 2: Click the format bar, and move mouse cursor to "Final Cut Pro > Apple ProRes 422 (*.mov)" as output format.
Step 3: Click "Convert" button to start encoding MKV files to Apple ProRes MOV for Final Cut Pro X under Mac OS Mountain Lion.
Some more helpful features of the MKV to FCP Converter for Mac
1. Settings- click to set video resolution(1920×1080/1440×1080/1280×720/720×480), bitrate（from 1Mbps to 20Mbps）, frame rate (24p/30p)
2. Editor (next to "Add" icon)- click to set deinterlace, denoise, mute, volume up, trim, crop, etc.
Once the MKV to ProRes 422 conversion is done, you can transfer MKV files into Final Cut Pro X for editing smoothly on Mac with ease.
1. If you meet any importing & editing problems with kinds of popular video edit programs like FCP, FCE, iMovie, Adobe Premiere Pro, Avid Media Composer, etc, you can link to Video Editors Tips and Tricks colum to get the solution.
2. If you are a Panasonic, Canon or Sony user, you can get the Full HD video camera tips to fast solve the MOV, AVCHD .mts/m2ts, MXF importing and editing issues.
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Source:How Do I use MKV video in Final Cut Pro X