I'm using the following command to resize and watermark videos: `ffmpeg -i "input video.mp4" -s 640x480 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" "output video.mp4"`

With this command I have to add each video line by line. How can I simply do the same thing to all videos in a directory, and specify an output folder? I'm using Windows.