To start editing footage in Final Cut Pro X, you shall create an event or import media files to an existing event. There are 3 ways to add footage to FCP X.
- Choose File > Import > Files to select a file or folder within the Import Files window.
- Choose File > Import From Camera to select camera archive.
- Drag the file from the Finder to the event.

With the Import Files window, you may notice that some files are grey out, which indicates that the files could not be imported. Below is the list I got from the Apple official site.
Video formats:
Apple Animation codec, Apple Intermediate codec, Apple ProRes (all versions), AVC-Intra, AVCHD (including AVCCAM, AVCHD Lite, and NXCAM), DV (including DVCAM, DVCPRO, and DVCPRO50), DVCPRO HD, H.264, HDV, iFrame, Motion JPEG (OpenDML only), MPEG IMX (D-10), Uncompressed 10-bit 4:2:2, Uncompressed 8-bit 4:2:2, XDCAM HD/EX/HD422, QuickTime formats,
Audio formats:
AAC, AIFF, BWF, CAF, MP3, MP4, WAV
Still-image formats:
BMP, GIF, PNG, PSD (static and layered), RAW, TGA, TIFF
Actually, the list above with video formats only indicates the codec, no specific file extensions. I have tried to import my files on Mac to FCP X and make my own list for video formats.
FCP X supported video files:
- .MOV, .MP4, .MOD, .AVI (only some of the .AVI with DV codec would work).
- AVCHD files are only supported as camera archive or with AVCHD folder structure.
The non-supported video format list could be long, for example, .MPG, .TS, .MKV, .VRO, .VOB and even 1080/60p .MTS. If you would like to make your HD video footage editable on FCP X, Aunsoft Video Converter for Mac is the best choice for you. It supports converting different formats to the Apple ProRes 422 with the same settings for you, so that you do not need to render files when importing to the project timeline.
no comment untill now