for %%A in (*.mp4) do (
"C:\Program Files (x86)\PortableApps\ffmpeg\bin\ffmpeg.exe" -i "%%A" -c:v vp9 -vf scale=930:-1 -sws_flags lanczos -cpu-used 4 -crf 30 -b:v 0 -g 9999 -lag-in-frames 25 -c:a libopus -b:a 96K -passlogfile "%%~NA" -y -an -pass 1 -threads 4 "%%~NA".webm
"C:\Program Files (x86)\PortableApps\ffmpeg\bin\ffmpeg.exe" -i "%%A" -c:v vp9 -vf scale=930:-1 -sws_flags lanczos -cpu-used 4 -crf 30 -b:v 0 -g 9999 -lag-in-frames 25 -c:a libopus -b:a 96K -passlogfile "%%~NA" -y -pass 2 -threads 4 "%%~NA".webm
)
pause