Best PHP or C libraries for handling images, video, and music: watermarking, thumbnailing, truncating, fading, etc.

Hello there,

What are the best php/c libraries for handling media including images,
video, and music?

I would like to manipulate media files, including watermarking,
thumbnailing, truncating, fading, etc.

I know there's the GD llibrary for images.

Is there anything comparable for video and music, as far as
watermarking, truncating, and thumbnailing go?

PHP or c libraries would be great.

Any resources/websites/links would be greatly appreciated!!

Thanks!

phpthumb rocks for imaging. google it.