Is there a filter for speeding up/slowing down video based on ratio?

[lansing]

I would like to know if there is one, just like using Adobe Audition, where you into a % to stretch/shrink a clip?

[hanfrunz]

you can use avisynth (http://www.avisynth.org) and its TimeStretch() (http://avisynth.org/mediawiki/TimeStretch) command.

[smok3]

isn't TimeStretch() audio only?