How to do a 2pass encode using the NVENC codec ? is it a single command, for example: ffmpeg -i INPUT.mp4 -c:v nvenc -preset hq -profile:v main -c:a aac -strict experimental -b:v 500000 -b:a 128k -cbr 1 -2pass 1 -y OUTPUT.mp4 or, do we need multiple pass commands as with h264 ?