C:\ffmpeg.exe -i "%1" -c:v libvpx -quality good -cpu-used 15 -b:v 768k -qmin 10 -qmax 30 -maxrate 500k -bufsize 768k -threads 2 -vf scale=w=1920:h=1080:force_original_aspect_ratio=decrease -c:a libvorbis -b:a 64k -f webm "%2".webm
C:\ffmpeg.exe -i "%1" -ss 00:00:01.000 -vframes 1 -f webp "%2".webp