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'''N'''on-'''L'''inear (Video) '''E'''diting system: in contrast to the older ''Linear'' video editing system, which operated by writing video segments to tape, starting at the beginning of the program and working to the end. If a program was to be lengthened or shortened, everything from the cut point until the end would have to be re-edited - or else "dubbed", losing a [[Wikipedia:Generation_loss|generation]] of quality. Needless to say, this was very restrictive. 

All modern digital video editing systems are non-linear{{Citation_needed}}, allowing the (human) editor to insert, delete, trim and move segments at will. Avisynth is a type of NLE [[Original_AviSynth_announcement|(the world's smallest by a factor of 500)]], as changing clips around, lengthening or trimming them, is very simple and straightforward. 

===== Example =====
Suppose we start with the following clips, and we want to assemble a program:
 clip_intro = [[AviSource]]("intro.avi")
 clip_main = AviSource("main.avi")
 clip_outro = AviSource("outro.avi")
 B = [[BlankClip]](clip_main)

Here is our first edit:
 edit_1 = clip_intro
 \     [[Splice|++]] B.[[Trim]](0, -15) 
 \     ++ clip_main 
 \     ++ clip_outro
 return edit_1

We find it runs a little too long, but it's easy trim it down a bit here and there:
 edit_2 = clip_intro
 \         .[[Trim]](0, clip_intro.[[Clip_properties|FrameCount]]-5)
 \     [[Splice|++]] B.Trim(0, -15) 
 \     ++ clip_main
 \         .Trim(0, 12345)
 \     ++ clip_main
 \         .Trim(12390, 0)
 \         .[[FadeOut]](15) 
 \     ++ clip_outro
 \         .[[FadeIn]](15)
 return edit_2

===== More Information =====
[http://en.wikipedia.org/wiki/Non-linear_editing_system Wikipedia: Non-linear editing system]

[[Category:Glossary]]
[[Category:AviSynth_Usage]]