To record in 1080p at 60 frames, it's recommended that you set the bitrate from 5,000 to 10,000 kbps in order to get the best video; although you can always go up to 60,000 kbps for 4k. For the audio bitrate, you can start as low as 64 kbps and can go up to 320 kbps for clearer sound.