In simple mode it's not possible to encode the audio in FLAC.No. You should not be using custom ffmpeg output for your use case
Switch output mode back to simple, set the recording quality to "Indistinguishable"
Recording format to MKV
Try the various encoders in the list until you get one that performs correctly for your system
You should ALWAYS be using partial/limited range color, as the entire video industry has standardized on it, and using full range color will lead to color distortion for your viewers.
NV12 or P010 color format should be set
Because youtube will likely, instead of actually converting with tone mapping, instead distort the colors in the conversion.If I'm recording, not streaming, why should I use partial instead of full range? If I decide to upload it later, yt converts it to partial.