Written by For this Switch to work you would need to use FFMPEG - shared_ffmpeg.zip Win32 build.
-vhook "vhook\imlib2.dll -x 10 -y 10 -i overlay.png"
Where x and y are coords.
Overlay.png is the text or logo with no/transparent background which we are going to use as Watermark.
And here is the switch which converts MP4 to FLV and places a watermark using -vhook
-i c:\video.mp4 -ar 22050 -ab 128000 -f flv -s 480×360 -aspect 4:3 -y -vhook "vhook\imlib2.dll -x 10 -y 10 -i logo.png" outputpath.flv
In very latest builds -vhook has been deprecated and -vf took its place.
To find more about whats going on FFMPEG nowadays please visit MPlayerHQ
