Multhreading in avisynth

[dylz]

I'm using xvid4psp to convert and i'm gonna try to copy avisynth.dll in system folder and MT in plugins and I want to know will this use all 4core's on my i7 without any scripting as i'm just gonna addfilters convert and aim to use all cores

Edit: also do i use 0.7 version of MT.dll or is there a 0.8 version? as im usin 2.58 avisynth

[Gavino]

To make Avisynth work multi-threaded, you have to add SetMTMode() and/or MT() command(s) to your script - otherwise the multi-threaded Avisynth just works in single-thread mode (like the original vanilla version).

See http://avisynth.org/mediawiki/MT
and http://avisynth.org/mediawiki/MT_support_page

As far as I know, there is no MT v0.8 - v0.7 will work with a 2.58-based multi-threading avisynth.dll.

[dylz]

alright what if i have 2.5.8 installed and swap the avisynth2.5.8 dll with the MT avisynth.dll so that it uses the previous version MT will it be compatibleand if i add Set mode so many cores to the xvid4psp generated script will it work?

[Gavino]

Yes, it will work (in principle).
But note that not all filters work properly in multi-threaded mode and those that do may require a specific mode number to be used with SetMTMode(). See the above links for more details.

It helps to understand how it works, but even if you do, it's still all a bit trial-and-error, with the potential for random crashes. That's why multi-threading is not yet built into the standard Avisynth.