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Ubuntu - Video - Convert H264 to H265

ffmpeg -i a.mp4 -c:v libx265 -map 0:v -c:a copy -map 0:a -c:s copy b.mkv

Using GPU Hardware Encoding

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi b.mkv
 
ffmpeg -threads 16 -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi c.mkv

NOTE: These allow the GPU to be used:

-hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128