https://www.xnview.com/en/nconvert/#downloads

https://ffmpeg.org/

Para o Nconvert: 


nconvert -out png -o %%_1.png -q 95 -rmeta -rexifthumb -noise uniform 0.1 *.png


Para o FFMpeg:


FOR /F "tokens=*" %%G IN ('dir /b *.mp4') DO ffmpeg -i "%%G" -vf noise=alls=1:allf=t "%%~nG_1.mp4