Using avisynth to SELECT every fifth frame

[pooksahib]

Hi. In the video I'm editing, there's a terrible slo-mo scene where the frames are aaaaabbbbbccccc etc. I can put it back to normal speed with

trim(0,0)++trim(5,5)++trim(10,10) etc

but I'd be there all day. Is there a way to script "start at frame 1234 then use every fifth frame"?
Many thanks.

[Selur]

SelectEvery is part of Avisynth and does what you want.

SelectEvery(clip, 5, 0)

chunks the source in groups of 5 and just keeps the first of each group.

[hello_hello]

SelectEvery(5, 2) would mean for each group of 5 frames you're keeping the third one (as Avisynth starts counting at zero).

Assuming it's a section in the middle of the video, say from frames 1234 to 2233.

A = last
B = A.Trim(0, 1233)
C = A.Trim(1234, 2233).SelectEvery(5, 0).AssumeFPS(24) # or whatever the original frame rate is
D = A.Trim(2234, 0)

B + C + D

or select 1 frame from each group of 5 starting at frame zero.

A = last
B = A.Trim(0, 1233)
C = A.Trim(1234, 2233).SelectRangeEvery(5, 1, 0)
D = A.Trim(2234, 0)

B + C + D

Edit: Selur beat me to it....

[pooksahib]

Brilliant, lads. Thanks a lot.