Manipulating frame order on all files in a folder

IanB, is there an advantage of using + instead of ++ when we don't care about audio/video sync ? Speed ? I tend to use ++ all the time just in case I modify later my script, but I never checked if there was a speed penalty.. ?

Great! This works: SetWorkingDir("L:\") file = "I:\SmallMovies-S\S_15-Love01.avi" clip1 = AVISource(file) count = Framecount(clip1) - 2 clip2 = clip1.Trim(1,count) clip2 = reverse(clip2) clip2 = clip1 + clip2 clip2 = FlipVertical(clip2) return clip2 I wrote now a script in the mIRC client to generate script files for a whole folder AVI's. All the manual parrot work I did in the past now done with one command. Can't believe I never discovered this before. Thanks!

@Alain2, AlignedSplice and UnAlignedSplice are both zero cost filters. i.e. they mearly adjust the parameters of the GetFrame and GetAudio chains, they do not actually process any data.