Manipulating frame order on all files in a folder

[yimmie]

I have a very common task: manipulating frame order.
I save short video parts and I have something called 'AVI constructor' to extract the frames, append them in reverse order, delete the middle and last, and make a movie from it.
The movie then appears as continous when repeating.
For example, suppose it is a 10 frames sequence AVI I saved, the frame order of the output AVI is 1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2.

I wonder if this can be automated.
Alike selecting a folder and produce for every movie in it the 'continous repeating' version of it, according to given frame handling commands.

I would save me from a huge amount manual work I have to do.

Someone on virtualdub forum said:

This is easy with an Avisynth script.

## numbering from 0: 012345678987654321
vid=avisource("yourvid.avi")
vid2=vid.trim(1,8).reverse()
vid1+vid2

So I downloaded Avisynth, and so far I wrote this with the AvsP script editor:

SetWorkingDir("L:\")
file = "I:\SmallMovies-S\S_15-Love01.avi"
clip1 = AVISource(file)
count = Framecount(clip1) - 2
clip2 = clip1.Trim(1,count).reverse()
clip2 = UnalignedSplice(clip clip1,clip clip2)

and it says Script error: expected a , or ) (Repeat.avs, line 6, column 34).
And I'm stuck on it. I can't find something in the help under \Docs that describes what exactly this is.

I have some experience with scripting in an IRC client named mIRC.
There, a function is called with either /functionname parameter1 parameter2 either $functioname(parameter1,parameter).optionalpropertyhere, where that property is then available inside the function as $prop.

This looks like something similar.
I tried deleting the () after reverse but the error remained.

Also, since my goal is batch processing, ie, I want to process a whole folder with such small AVI clips, I downloaded ScriptWriter, I had to find and download that mscoree.dll and placed it into the ScriptWriter.exe folder but it popups that it could be damaged and has an invalid format.
I read on the forum that it requires a .NET framework, I downloaded it and tried to install but it says I have to install some version of Internet Explorer and that I refuse to do, I don't want that crap anymore on my PC.
But it might be possible without.

Can someone help me on the path to my goal?

[IanB]

clip2 = UnalignedSplice(clip clip1,clip clip2)This is wrong, the declaration form is used when declaring functions.
clip2 = UnalignedSplice(clip1, clip2)This is how is should be.
clip2 = clip1 + clip2Or more conventionally we use + and ++ to invoke the splice filters. (internally the 2 syntaxes are identical)

[Alain2]

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.. ?

[yimmie]

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!

[Guest]

Someone on virtualdub forum said: That was me. Why didn't you follow up there?

[IanB]

@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.

[yimmie]

That was me. Why didn't you follow up there?
At that moment all I knew about Avisynth was its name, from seeing it here and there on the VirtualDub site.
In the following days I searched information about it and found this forum, and I asked here about the problem I ran into, since it's directly related to Avisynth, that is the reason. You pointed me in the direction I needed.