I shoot 4k UHD as it fits nicer in a 16:9 project than the slightly taller 4k DCI. Down-res using FCPX into a 1080p timeline.
Shoot at 24p or 30p depending on if I want slight slow motion. Usually do 24p as it allocates the limited 60mbps bitrate for 15% fewer frames.
Shoot with the LOG color profile and the custom picture settings to -1 Sharpness, -3 Contrast and -3 Saturation. White balance set to Sun or cloudy depending on the day. I don't use auto.
Manual exposure settings with Gain as low as possible (100). I use the shutter speed to compensate for exposure, trying to keep it as close to 1/60 as possible. Additional ND filters are a must to reduce exposure enough to maintain 1/60 shutter speed.
I dislike the artifacts in the inspire 1 video. I believe the camera over sharpens the image by default. I recently downloaded the new Neat Video 4 noise reduction software plugin and it does a very good job at cleaning the video and minimizing the artifacts in the video. This takes a long time and I only use it for high-end projects. But, it does make a difference in my opinion and allows matching of aerials to traditional terrestrial footage shot with much nicer cameras.
Export to whatever you want for YouTube. If you want to show 4k, export 4k H.264 at 30,000-40,000kbps. 1080p will look good exported at 10,000-20,000kbps. You need to remember that YouTube will encode the video again after you upload it, so it helps to upload a higher bitrate than you would just viewing a local file.
Then again, no one is going to watch the 4k on YouTube besides the people on this forum, so you need to consider if the processing and upload time is worth it to you in the long run.
DVD gets smashed down to 720x480 so you don't even need to shoot 1080p for that to look good. Keep it simple if that's your medium - it's heartbreaking to see 4k content you painstakingly produced on a SD DVD player...
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