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#What is avisynth 2.6 mt full

More complex frame access patterns like SelectEvery(10,3,6,7) are not supported (but might work anyway as the requested frames are in the cache, there will just be some wasted memory from non requested frame in the cache). This is how many frames there are between each frame request, so if you are only going to read every second frame set it to 2 or if you are reading the frames backwards set it to -1. You can use an Avisynth defined filter or a non-source filter but it might crash or produce frame corruption. Currently only internal and external source filters are supported (like DirectShowSource, AviSource, MPEG2Source). MTsource MTsource(string filter, int delta, int threads, int max_fetch) string filter = (no default) It can be any built-in filter, Avisynth defined filter or external plugin filter as long as the restrictions are observed. Note that the filter is allowed to change both width and height at the same time but only 1 input clip is allowed. Must be mod2 height for RGB and YUY2 color-spaces and mod4 height for YV12 colorspaceįilter to run multithreaded. MTi MTi(clip clip, string filter) clip clip = last If true the frames are cut vertically (and the filter is allowed to change the height) else it is cut horizontally (and the filter is allowed to change the width). Increase this if you see artifacts where the frame is split. Number of pixels to add at the top and bottom border or left and right border.

Set this to the number of threads your computer is able to run concurrently. Note that the filter must not change both the frame height and width (but colorspace is okay) and that only 1 input clip is allowed. Syntax MT MT(clip clip, string filter, int threads, int overlap, bool splitvertical) clip clip = lastįilter to run multithreaded. Unlike the two other filters, MTsource is a temporal filter that fetches frames ahead of time and stores them in the cache for fast retrieval.

MTsource is used to run source filters multithreaded.

Note that only two threads are created so it will only use two (virtual) cores.

MTi creates two threads and lets each thread process one field, combining them like this Avisynth function:Ī=eval("c.AssumeFieldBased().lecteven()."+filter)ī=eval("c.AssumeFieldBased().lectodd()."+filter)Īs in the previous example, a and b are executed in parallel.

Remember to back up the old avisynth.dll (rename it or something) if you don't have version 2.6 installed.įrom version 0.7 two other filters are included too: Most filters are thread safe but some will produce a wrong result or crash.Ĭopy mt.dll into the Avisynth plugin directory and copy the included avisynth.dll into your System32 directory (SysWOW64 on 64-bit Windows) or where avisynth.dll is located. Also the filter should not rely on the content of the whole frame (like smart deinterlacers) else there is a risk that only part of the frame will be processed. The filter to be run must accept only one input clip and that is taken from the special variable last. Dust does not work with the above script, so if you want to use iiP, use another denoiser or get Steady to fix the bug. If the filter works with the above script, it should work with MT if the filter is thread safe. The only difference is that a and b are executed in parallel and it is possible to split the frame into more than 2 pieces. The filter works like this Avisynth function:Ī=eval("c.crop(0,0,src.width/2,src.height)."+filter)ī=eval("c.crop(src.width/2,0,src.width/2,src.height)."+filter) Note that if you are already getting 100% CPU utilization when processing Avisynth scripts (eg if you're encoding to DivX/XviD) you don't need to use this filter. I tested it on my old abit bp6 with 2x celeron 400 MHz and it increased the speed by 40%.

#What is avisynth 2.6 mt full

MT is a filter that splits a frame up into smaller fragments that are processed in individual threads, allowing full utilization of multiprocessor or hyper-thread enabled computers. This should hopefully speed up processing on hyperthreaded/multicore processors or multiprocessor systems.Īlways remember to judge the result by looking at the speed improvement - not the CPU utilization. MT is a filter that enables other filters to be run multithreaded.

Note: Not maintained anymore use Avisynth 2.6 builds instead.