How to encode Sony Alpha a99 II AVCHD to ProRes for FCP X?

Final Cut Pro X won't import Sony Alpha a99 II AVCHD mts files after the upgradation to macOS High Sierra? Actually, this is a known issue. Before Apple releases a fix for the problem, you can solve the issue via transcoding Sony Alpha a99 II AVCHD footage to Apple ProRes codec encoded QuickTime MOV format first before you start editing in FCP X.

"How do I convert Sony Alpha a99 II AVCHD mts files for FCP X? My Sony Alpha a99 II saves the clips in mts file format. I would like to edit them in FCP X, and for this I need to convert them for instance QuickTime. There are numerous suggestions as to which converter is the best, and I have tried a handful without success - including bought versions. They either cannot convert at all or convert into something which turns out to be useless and/or severely reduced quality in FCP X. Should I try converting to another format and which converter works for you?"

If for some reason you need to convert Sony Alpha a99 II AVCHD mts files for FCP X, you can give Video Converter for Mac a shot. It is able to export optimized ProRes codec for editing in FCP X with optimum performance.

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How to transcode Sony Alpha a99 II AVCHD mts files to ProRes for FCP X?

To transcode Sony Alpha a99 II AVCHD footage to ProRes for FCP X, do as below:

Video Converter (It is available for Mac, simply download the proper version depending on your computer.)

Step 1: Import Sony Alpha a99 II AVCHD mts files. Start up Video Converter for Mac and click "Add File" to load Sony Alpha a99 II AVCHD video files that you need to convert into this program. This converter supports batch conversion, so you can import a bundle of Sony Alpha a99 II AVCHD video files into it to do conversion at a time.

Step 2: Choose output format for FCP X from "Profile" list Working well as an Sony Alpha a99 II AVCHD converter app, Video Converter for Mac comes with a flavor of Apple ProRes codecs , including Apple ProRes 422, Apple ProRes 422 (HQ), Apple ProRes 422 (LT), Apple ProRes 422 (Proxy) and Apple ProRes 4444. For a good balance between quality and file size, we would recommend choosing "Apple ProRes 422 (*.mov)" as output format under "Final Cut Pro" column. The ProRes 422 codec will ensure a good performance working in FCP X even on an old Mac machine.

Tips: If necessary, you can click "Settings" button to modify video and audio parameters like encoder, resolution, frame rate, bitrate, aspect ratio, sample rate, and audio channels. You can also "Enable 3D Settings" to add 3D effect to your source media.

Step 3: Start Sony Alpha a99 II AVCHD MTS to FCP X conversion. Click "Convert" to start Sony Alpha a99 II AVCHD mts video to ProRes 422 conversion for FCP X. As soon as the conversion is complete, you can click "Open Folder" to get the generated Apple ProRes 422 files for editing in FCP X with optimum performance. Hope it helps.