AVIsynth: is there such a function like repeat/until or for/next ?

[vhelp]

In AVIsynth, what is the equiv of for/next or repeat/until or do/while or whatever

I need run several selectevery() but based on a value or else a condition--switch to diff select, etc. It should be simple, i hope.

i.e.


REPEAT

a = select(1)
b = select(2)
int counter = 0

inc(counter); if counter>1 then counter=0
if counter=0 then do a else b

UNTIL last_frame_found

..throughout the entire clip..

I searched, but http://avisynth.org/mediawiki/Special:Search?search=repeat&go=Go
seems to leave me beleaving there is no function or can not be done, so there must be some technique not yet discovered/used, I don't know.

I may turn it into a function, just not sure at this point, mainly debugging different ideas .. thanks for any leads.

-vhelp 5369

[Gavino]

In standard Avisynth, there is no looping in the script language - you have to do it using recursive functions.
The GScript plugin provides while/for loops as language extensions (also if/then/else blocks).

Note however that explicitly looping over all frames in the script is probably a bad idea, for performance reasons. For doing frame-dependent processing, it is better to use the ScriptClip function, which allows arbitrary script code to be run at each frame during rendering.

[Khaver]

Can't you just combine each selectevery into 1 selectevery?

if selectevery(a) is selectevery(5,0,3) and selectevery(b) is selectevery(4,1,3), just combine them to selectevery(9,0,3,6,8).

[vhelp]

update -- I know its been a while since i first posted the question, but .. unfortunately, gscript doesn't work on my system. "not an avisynth 2 C" error. Anyway, it must be a version problem, i'm running v2.57 so i'll assume that's the cause.

I found these twp pages on this plugin but didn't see this error reported there.

http://forum.doom9.org/showthread.php?t=147846
http://forum.doom9.org/showthread.php?t=147846&page=2

ah, found v2.5.8, downloading now..

file: http://www.afterdawn.com/software/general/download.cfm/avisynth?mirror_id=0&version_id...oftware_id=476

edit: turns out i used the loadplugin incorrectly..anyway, now have v2.5.8 running w/ GScript but can't seem to get it to do what I was trying to-to simulate the above first post--just yet.

-vhelp 5373

[Gavino]

now have v2.5.8 running w/ GScript but can't seem to get it to do what I was trying to-to simulate the above first post--just yet.

Post your script and I will take a look.

Actually, there is a logical error in your earlier pseudo-code:

REPEAT

a = select(1)
b = select(2)
int counter = 0

inc(counter); if counter>1 then counter=0
if counter=0 then do a else b

UNTIL last_frame_found

counter is always reset to 0 inside the loop.
Could this be the problem?