x264 params i was just messing with.

./ffmpeg -threads 16 -i /home/ec2-user/input.mov -level 4.0 -r 59.94 -c:v libx264 -x264-params "nal-hrd=cbr" -x264-params "output-csp=yuv420p" -x264-params "input-csp=yuv420p" -crf 18 -maxrate 7M -bufsize 7M -vf scale=1280x720 -c:a aac -y test.mp4 -ar 48000 -ac 2 -b:v 218 -refs 4 -keyint_min 13 -profile:v main -level 4.1 -preset slow -filter_complex "[0:a:0][0:a:1]amerge=inputs=2"; date