I'm doing a full page background video and I'm trying to convert the original mp4 to an webm. The background will not have any audio.
I'm currently using ffmpeg.
ffmpeg -i INPUT.mp4 -b 614400 -s 960x540 -aspect 16:9 OUTPUT.webm
My question is what are the optimal settings to convert an mp4 to an webm file that will be used as a background video on a website?