ffmpeg to convert 4k/hdr10 to (i) h.264/10-bit/.mp4 (ii) h.265/10-bit/.mp4

[hydra3333]

I'm a tad confused and am looking for assistance in a couple of things.

I googled for a couple of hours, found a plethora of semi-conflicting information,
and am still not much clearer on what FFMPEG commandline switches to use to
convert (re-encode) a 4K HDR webm video,
eg vp9.2 (and other similar samples in various formats from across the web)
into

1. an mp4 container as h.264/HDR(10-bit)/4k, presmably profile main10 and level 5.1
2. an mkv container as h.264/HDR(10-bit)/4k, presmably profile main10 and level 5.1

as well
3. an mp4 container as hevc/HDR(10-bit)/4k similar to 1 and 2
4. an mkv container as hevc/HDR(10-bit)/4k similar to 1 and 2

I'd prefer to use ffmpeg rather than x264 and x265 if possible.

Any example FFMPEG commandlines and/or link(s) would be very greatly appreciated.

I've seen something similar to this proposed on the web for hevc although I'm yet to give it a try

ffmpeg -input-depth 10 -pix_fmt yuv420p10le -i input.vp9.2.webm -an -c:v libx265 \
-x265-params "colorprim=bt2020:transfer=smpte-st-2084:colormatrix=bt2020nc:master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,10):max-cll=0,0:hdr" \
-profile:v main10 -level:v 5.1 -crf 15 output.mp4

[TE16]

H264 cannot encode to HDR. Only HEVC can encode to HDR.

For H264, the best you'll get with 10bit is i444.

[hydra3333]

OK Thank you.