Positioning watermark on video/photos using FFMPEG

[hepii]

Postion: Bottom-Left
--> -filter_complex "overlay=10:main_h-overlay_h-10"

Position: Top-Left
--> -filter_complex "overlay=10:10"

Position: Bottom-Right
--> -filter_complex "overlay=main_w-overlay_w-10/2:main_h-overlay_h-10/2"

Position: Top-Right
--> -filter_complex "overlay=main_w-overlay_w-10:10"

Position: Centre
--> -filter_complex "overlay=main_w/2-overlay_w/2:main_h/2-overlay_h/2"

Position: Centre-Bottom
--> -filter_complex "overlay=main_w/2-overlay_w/2:main_h-overlay_h-10"