>>297801
>not maximum allowed value of -lag-in-frames 25
also, do note, that -tile-columns, -tile-frames -frame-parallel and -threads are used to speed up encoding and actually worsen quality of the webm by some amount.
Also don't know exactly i know that's the case with libx264, but ffmpeg should accept all of the options vpxenc exposes, and if you're interested in what they actually do, as opposed to how to use them, this is the way to go about learning them, i.e vpxenc --help
>>297796
>Is there a steep learning curve?
Might be, but, ffmpeg is one of the best documented piece of software out there, if you're not a total retard and can read a good read of manpage/docs will get you 90% of answers you need