[cafevincent]

I am curious if there is a way to encode using simple effects like combining source with another video layer containing film grain, scratches and burns. Or encode in mirror image or even reverse order (from end to beginning)? Or doubling the frame rate for smoother motion (half duration). This would be fun for creating smooth timelapse versions of some nature footage.

I'm not sure if these are things to look for in a codec or filter/shader or what or are these maybe features in some editing programs?

Please also mention if mirror image is possible during playback. I can't find such a shader for some reason. I would imagine it would be super popular for watching an old movie again. And I assume reverse playback on-the-fly probably doesn't exist.