With X-T4, it is possible to record professional-quality 4K/60P 10-bit video at 4:2:0 color internally and 4:2:2 via the built-in HDMI port.
When doing so internally at 200Mbps, the camera also supports H.264/MPEG-4 AVC as well as H.265/HEVC, to achieve a higher rate of compression.
You can also choose MP4 in addition to the standard MOV video file format for greater versatility.