早速実験しようとしたけどエラーが・・・

x265.exe --svt --svt-preset-tuner 6 test-1080p.mkv -o test-1080p.mp4

x265 [warning]: svt-preset-tuner should be used only with ultrafast preset; Ignoring it
x265 [error]: yuv: width, height, and FPS must be specified
x265 [error]: unable to open input file <test-1080p.mkv>