does anyone know how to watermark video from the Linux command line using a simple tool?
Watermarking in ffmpeg isn't supported in the current version, and requires a custom compile.
Max.
ffmpeg -y -i 'inputFile.mpg' -vhook '/usr/lib/vhook/watermark.so -f /home/user/logo.gif'
Make note of the "-vhook" parameter; watermark.so path may vary.