suggestion: fallback encoder

[shackleford92]

h264_nvenc gets fussy when you feed it a 10bit file.
it seems there are workarounds but they are beyond my grasps.
however would it be possible to specify a failsafe?
my loose grasp of my research is 10bit needs cpu, so mpeg2video maybe?

hevc 10bit input
output:
[h264_nvenc @ 00000285c760dc00] 10 bit encode not supported
Last message repeated 1 times
[h264_nvenc @ 00000285c760dc00] No capable devices found
[vost#0:0/h264_nvenc @ 00000285c7607cc0] Error while opening encoder - maybe incorrect parameters such as bit_rate, rate, width or height.

do i need to use a 10bit display

hevc_nvenc is spotty depending on the ffmpeg used