I have been shooting some MP4 footages using the Panasonic DMC-GH4 for various output purposes. When I use log and transfer to import the GH4 MP4 files into FCP X, I can't preview the video in the preview window. How to slove this problem? Is it possible to edit MP4/MOV/AVCHD video in FCP X without rendering? Which format is the best for editing in FCP X?

The Panasonic LUMIX DMC-GH4 is the world's first DSLM with 4K cinematic recording capability. It can also capture still images, 1080p video (at up to 96fps for slow-motion capture), and has a splash and dustproof design for all-weather shooting. It captures 4K footage at up to 30fps (24fps and 25fps are also available for a cinematic look), and it can store that footage at a 100Mbps bitrate using IPB compression in an MP4 or MOV container format. Users can freely choose the format from MOV, MP4, AVCHD Progressive and AVCHD at a variety of frame rates according to the usage.
Look for the ideal way to import and edit your Panasonic DMC-GH4 recordings in FCP X? As we know, Apple ProRes codec video is supported by Final Cut Pro well, and we can edit ProRes 422/4444 MOV files in FCP X, FCP 7 and FCP 6 without rendering. So, for importing and editing Panasonic DMC-GH4 fpptage in FCP freely, we need to convert Panasonic DMC-GH4 video to ProRes codec on Mac. Luckily, I got Acrok Video Converter Ultimate for Mac, an excellent Panasonic video converter that can convert and simultaneously deinterlace Panasonic DMC-GH4 4K and 1080P videos to ProRes MOV on the latest Marvericks. What's more, this powerful 2K/4K/HD camera video to ProRes Converter, which can convert MP4, MOV and AVCHD to ProRes 422, ProRes 4444, ProRes 422 Proxy, ProRes 422 HQ, ProRes 422 LT for Final Cut Pro X easily. If you want to convert Panasonic DMC-GH4 video to ProRes 422 MOV on Windows, you can free download Acrok Video Converter Ultimate Windows version here.
Below is the guide mainly showing you how to convert Panasonic DMC-GH4 video to Apple ProRes 422/4444 for FCP X via Acrok HD Video Converter for Mac. The Mac Panasonic Vdieo Converter is powerful to transcode any video to Apple ProRes codec for use in FCP X, FCP 7 and FCP 6, such as convert MP4 to ProRes 422/4444, transcode H.264 MOV to ProRes 422/4444, encode AVCHD/MTS to ProRes 422/4444, and more without quality loss.
How to convert Panasonic GH4 video for FCP X?
1
Add Panasonic DMC-GH4 video
Run Acrok HD Video Converter for Mac as the perfect Panasonic DMC-GH4 Video Converter, and add your MP4/MOV/AVCHD files into this Mac ProRes video converter.

2
Choose Apple ProRes format you need.
Click on "Format" and choose Final Cut Pro category, you can select "Apple ProRes 422 (*.mov)" or "Apple ProRes 4444 (*.mov)" as output format for editing in FCP X with higher quality.

Tip 1: Click the "Settings” icon and you will go into "Profile Settings” interface. You can adjust codec, bit rate, frame rate, sample rate and audio channel according to your needs and optimize the output file quality. If you want to trim, crop Panasonic DMC-GH4 video via this program, just clicking on "Edit" icon. By the way, batch conversion is also supported by the Panasonic DMC-GH4 to FCP Converter tool.
Tip 2: If you want to edit Panasonic GH4 video in Premiere Pro and iMovie, you can read this guide:
Panasonic Lumix GH4 Premiere Pro/iMovie

3
Start Panasonic DMC-GH4video to ProRes video conversion
Convert Panasonic 4K MOV/MP4/AVCHD to Apple ProRes MOV by clicking "Convert" button.
4
Import Panasonic DMC-GH4 video into FCP X
After conversion, click "Open" button to locate the converted video files. Run Final Cut Pro X, you can import and edit the videos freely.
That"s all! Hopefully the converting Panasonic DMC-GH4 MP4/MOV/AVCHD for FCP X guide will help the experience of editing videos in FCP X easier and faster.