Microsoft Windows [Version 10.0.19045.6396]
(c) Microsoft Corporation. All rights reserved.

C:\Users\Old Gamer>cd downloads

C:\Users\Old Gamer\Downloads>cd video

C:\Users\Old Gamer\Downloads\Video>ffmpeg -i video.mp4 -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis output.mkv