Short version: add Prefetch() as the last call in your script and add SetFilterMTMode() calls for each plugin you are using. There are quite a few you must enable for QTGMC.
This list of SetFilterMTMode calls will get you started (straight from the Google searches that you still need to do):
Code:
SetFilterMTMode("removegrain", MT_NICE_FILTER)
SetFilterMTMode("repair", MT_NICE_FILTER)
SetFilterMTMode("verticalcleaner", MT_NICE_FILTER)
SetFilterMTMode("clense", MT_NICE_FILTER)
#medianblur
SetFilterMTMode("medianblur", MT_MULTI_INSTANCE)
SetFilterMTMode("medianblurtemporal", MT_MULTI_INSTANCE)
#masktools
SetFilterMTMode("mt_invert", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_binarize", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_inflate", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_deflate", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_inpand", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_expand", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_lut", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_lutxy", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_lutxyz", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_luts", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_lutf", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_lutsx", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_lutspa", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_merge", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_logic", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_convolution", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_mappedblur", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_makediff", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_average", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_adddiff", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_clamp", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_motion", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_edge", MT_MULTI_INSTANCE)
SetFilterMTMode("mt_hysteresis", MT_MULTI_INSTANCE)
SetFilterMTMode("sangnom2", MT_SERIALIZED) #can run with 2 but you should specify threads=1 then, otherwise too many threads will get created without any benefit
SetFilterMTMode("average", MT_NICE_FILTER) # starting from v0.94, the plugin self registers the MT mode
SetFilterMTMode("TMaskCleaner", MT_MULTI_INSTANCE)
SetFilterMTMode("checkmate", MT_NICE_FILTER)
SetFilterMTMode("Deblock", MT_NICE_FILTER)
SetFilterMTMode("msharpen", MT_MULTI_INSTANCE)
SetFilterMTMode("TColorMask", MT_NICE_FILTER)
SetFilterMTMode("Vinverse", MT_MULTI_INSTANCE)
SetFilterMTMode("Vinverse2", MT_MULTI_INSTANCE)
#########################################
# Core filters (because putting it here is easier than modifying the source and firing a PR)
##################################
SetFilterMtMode("DirectShowSource", MT_SERIALIZED)
SetFilterMtMode("AudioDub", MT_SERIALIZED)
#########################################
# External filters (guessed, might not be very stable)
##################################
SetFilterMTMode("DitherPost", MT_NICE_FILTER)
SetFilterMTMode("Dither_resize16", MT_MULTI_INSTANCE)
SetFilterMTMode("SmoothGrad", MT_MULTI_INSTANCE)
SetFilterMTMode("Dither_box_filter16", MT_MULTI_INSTANCE)
SetFilterMTMode("Dither_limit_dif16", MT_NICE_FILTER)
SetFilterMTMode("dfttest", MT_SERIALIZED) #same story as with sangnom2
SetFilterMTMode("AddGrainC", MT_MULTI_INSTANCE)
SetFilterMTMode("FFT3dGPU", MT_SERIALIZED)
#############################################
# External Filters (tested)
#############################################
# Testing info:
# 1. All processing plugins have been tested with ColorBars(pixel_type="YV12") as the source. Plugins that do not support YV12 have been tested accordingly.
# 2. AVSMeter is used to check optimal performance and VDub/MPC-HC is used to check correct output.
#############################################
# Source plugins
SetFilterMTMode("DGSourceIM", MT_SERIALIZED) #DGDecIM beta 50 2015/10/10
SetFilterMTMode("DGSource", MT_SERIALIZED) #DGDecNV 2046 2014/01/01 - GPU decoding
SetFilterMTMode("DSS2", MT_SERIALIZED) #DSS2 2.0.0.13 2014/11/10
SetFilterMTMode("FFAudioSource", MT_SERIALIZED) #FFMS2 V2.22 2015/10/12
SetFilterMTMode("FFImageSource", MT_SERIALIZED) #FFMS2 V2.22 2015/10/12
SetFilterMTMode("FFFFmpegSource2", MT_SERIALIZED) #FFMS2 V2.22 2015/10/12
SetFilterMTMode("FFMS2", MT_SERIALIZED) #FFMS2 V2.22 2015/10/12
SetFilterMTMode("FFVideoSource", MT_SERIALIZED) #FFMS2 V2.22 2015/10/12
SetFilterMTMode("FRIMSource", MT_SERIALIZED) #FRIMSource V1.26 2016/01/16
SetFilterMTMode("JpegSource", MT_SERIALIZED) #JpegSource ---> 2014/04/19
SetFilterMTMode("LSMASHAudioSource", MT_SERIALIZED) #LSMASHSource r877 2016/03/09
SetFilterMTMode("LSMASHVideoSource", MT_SERIALIZED) #LSMASHSource r877 2016/03/09
SetFilterMTMode("LWLibavAudioSource", MT_SERIALIZED) #LSMASHSource r877 2016/03/09
SetFilterMTMode("LWLibavVideoSource", MT_SERIALIZED) #LSMASHSource r877 2016/03/09
#SetFilterMTMode("RawSource", MT_SERIALIZED) #RawSource26 20160528 2016/05/28 # this line is not needed after 20160528
# Processing plugins
# Processing plugins
SetFilterMTMode("aBlur", MT_NICE_FILTER) #aWarpSharp2 ---> 2012/03/28 - Odd, with certain Prefetch values mode 1 is slightly better with other values mode 2 is slightly better???
SetFilterMTMode("aSobel", MT_NICE_FILTER) #aWarpSharp2 ---> 2012/03/28 - Same as aBlur
SetFilterMTMode("aWarp", MT_NICE_FILTER) #aWarpSharp2 ---> 2012/03/28 - Same as aBlur
SetFilterMTMode("aWarp4", MT_NICE_FILTER) #aWarpSharp2 ---> 2012/03/28 - Mode 1/2/3 perform very similar and have no real inprovement over single threaded.
SetFilterMTMode("aWarpSharp", MT_NICE_FILTER) #aWarpSharp2 ---> 2012/03/28 - Same as aBlur
SetFilterMTMode("aWarpSharp2", MT_NICE_FILTER) #aWarpSharp2 ---> 2012/03/28 - Same as aBlur
SetFilterMTMode("DeCross", MT_SERIALIZED) #DeCross v0.0.02 2004/02/01 - Mode 1/2 hang up and crash. Mode 3 with Prefetch >1 is much less effecient than single threaded.
SetFilterMTMode("frfun7", MT_MULTI_INSTANCE) #frfun7 rev6 2006/05/10 - With mode 1 the output is corrupted. This plugin works well by itself but it's really slow with other filters. (2013 version seems to work as mode 1)
SetFilterMTMode("gradfun2db", MT_MULTI_INSTANCE) #gradfun2db v1.0 2006/03/15 - With mode 1 the output is corrupted, random artifacts when playing and/or seeking.
SetFilterMTMode("MosquitoNR", MT_SERIALIZED) #MosquitoNR v0.10 2013/03/14 - It also works with mode 2, but you have to set MosquitoNR(threads=1) so it does not create any unnecessary threads.
SetFilterMTMode("StaticNoiseC", MT_NICE_FILTER) #StaticNoiseC ---> 2011/01/08 - Mode 1/2 performance is almost identical.
SetFilterMTMode("SVSuper", MT_NICE_FILTER) #SVPflow 4.0.0.128 2016/02/12 - Documentation states "all filters now compatible with MT mode 1"
SetFilterMTMode("SVAnalyse", MT_NICE_FILTER) #SVPflow 4.0.0.128 2016/02/12 - Documentation states "all filters now compatible with MT mode 1"
SetFilterMTMode("SVSmoothFps", MT_NICE_FILTER) #SVPflow 4.0.0.128 2016/02/12 - Documentation states "all filters now compatible with MT mode 1"
SetFilterMTMode("tcanny", MT_MULTI_INSTANCE) #tcanny v1.0 2009/06/03 - With mode 1 the output is corrupted, random artifacts when playing and/or seeking.
SetFilterMTMode("tdtrans", MT_MULTI_INSTANCE) #tcanny v1.0 2009/06/03 - Same as tcanny
#SetFilterMTMode("TCannyMod_TCannyMod", MT_NICE_FILTER) #TCannyMod v1.2.0 2016/05/25 #this line is not needed after v1.2.0
#SetFilterMTMode("TCannyMod_GBlur", MT_NICE_FILTER) #TCannyMod v1.2.0 2016/05/25 #this line is not needed after v1.2.0
#SetFilterMTMode("TCannyMod_EMask", MT_NICE_FILTER) #TCannyMod v1.2.0 2016/05/25 #this line is not needed after v1.2.0
SetFilterMTMode("TEdgeMask", MT_MULTI_INSTANCE) #TEdgeMask v0.9 2005/01/20 - Same as tcanny
SetFilterMTMode("TEMmod", MT_MULTI_INSTANCE) #TEMmod v0.2.0 2013/08/12 - Same as tcanny
SetFilterMTMode("TMM", MT_MULTI_INSTANCE) #TMM v1.0 2007/04/06 - Mode 1 randomly crashes and mode 2/3 are not very efficient.
SetFilterMTMode("TNLMeans", MT_MULTI_INSTANCE) #TNLMeans v1.0.3 2007/08/28 - Mode 1 is extremely slow
SetFilterMTMode("UnsharpHQ", MT_MULTI_INSTANCE) #UnsharpHQ v0.5 2014/01/19 - Mode 1 creates a few extra threads without any benefit.
SetFilterMTMode("VideoScope", MT_NICE_FILTER) #VideoScope v1.2 2004/05/01 - Mode 1/2 performance is almost identical.
SetFilterMTMode("flash3kyuu_deband", MT_MULTI_INSTANCE) #flash3kyuu_deband v1.5.1 2012/04/07 - Also works with mode 1 if set mt=False
# flash3kyuu_deband 2.0pre2 2012/12/03 - Crashes with mode 1 even with mt=False
# Filters from Dither 1.25.0. Tested by Firesledge (not extensively though)
SetFilterMTMode("DitherPost", MT_NICE_FILTER)
SetFilterMTMode("SmoothGrad", MT_NICE_FILTER)
SetFilterMTMode("Dither_box_filter16", MT_NICE_FILTER)
SetFilterMTMode("Dither_bilateral16", MT_NICE_FILTER)
SetFilterMTMode("Dither_limit_dif16", MT_NICE_FILTER)
SetFilterMTMode("Dither_resize16", MT_NICE_FILTER)
SetFilterMTMode("Dither_out", MT_NICE_FILTER)
SetFilterMTMode("Dither_removegrain16",MT_NICE_FILTER)
SetFilterMTMode("Dither_repair16", MT_NICE_FILTER)
SetFilterMTMode("Dither_median16", MT_NICE_FILTER)
SetFilterMTMode("Dither_add16", MT_NICE_FILTER)
SetFilterMTMode("Dither_sub16", MT_NICE_FILTER)
SetFilterMTMode("Dither_max_dif16", MT_NICE_FILTER)
SetFilterMTMode("Dither_merge16", MT_NICE_FILTER)
SetFilterMTMode("DGDecode_mpeg2source", MT_SERIALIZED) #seems to work fine as 1 although MT_SERIALIZED is recommended for almost all source filters
SetFilterMTMode("ColorMatrix", MT_NICE_FILTER) #read note2
SetFilterMTMode("NNEDI3", MT_MULTI_INSTANCE)
SetFilterMTMode("eDeen", MT_SERIALIZED) #1 and 2 gave errors
SetFilterMTMode("Deen", MT_SERIALIZED) #2 randomly gave errors, or corrupted output
SetFilterMTMode("VagueDenoiser", MT_MULTI_INSTANCE)
SetFilterMTMode("TFM", MT_MULTI_INSTANCE) #2 is faster. 1 crashes randomly.
SetFilterMTMode("TDecimate", MT_SERIALIZED) #1 gave error, 2 was slower than 3
SetFilterMTMode("FTurnLeft", MT_NICE_FILTER) #FTurn is deprecated since it's already included in the avs+ core
SetFilterMTMode("FTurnRight", MT_NICE_FILTER) #FTurn is deprecated since it's already included in the avs+ core
SetFilterMTMode("nnedi3ocl", MT_MULTI_INSTANCE)
SetFilterMTMode("Yadif", MT_MULTI_INSTANCE)
#note1: Can't use mode 1 or 2 on any filters if encoding 1080i files(480i works perfectly fine).
#FFVideoSource runs a few seconds, however, it always crashes.
#As far as I know, the only workaround seems to be running a deinterlacer right after the video source and running it as "MT_SERIALIZED",
#than running any desired filters after. Filters after the deinterlacer, seem to be able use any mode.
#note2: tried multiple files, seems to corrupt video even when it is the only filter in a script.
#tried mode 1, 2, and 3, none worked. however it works fine if MT isn't enabled.
#should ColorMatrix still be in the list? as a notice? or should it be removed?
#tp7's update: removed sangnom2 and vinverse lines since they cannot run with mode 1 correctly (updated versions can but those will register themselves anyway), also removed core filters
#note1: Can't use mode 1 or 2 on any filters if encoding 1080i files(480i works perfectly fine).
#FFVideoSource runs a few seconds, however, it always crashes.
#As far as I know, the only workaround seems to be running a deinterlacer right after the video source and running it as "MT_SERIALIZED",
#than running any desired filters after. Filters after the deinterlacer, seem to be able use any mode.
#note2: tried multiple files, seems to corrupt video even when it is the only filter in a script.
#tried mode 1, 2, and 3, none worked. however it works fine if MT isn't enabled.
#should ColorMatrix still be in the list? as a notice? or should it be removed?
#########################################
SetFilterMTMode("FRFun3d", MT_NICE_FILTER)
SetFilterMTMode("ContinuityFixer", MT_NICE_FILTER)
SetFilterMTMode("ReferenceFixer", MT_NICE_FILTER)
SetFilterMTMode("SmoothLevels", MT_NICE_FILTER)
SetFilterMTMode("SmoothTweak", MT_NICE_FILTER)
SetFilterMTMode("SmoothCurve", MT_NICE_FILTER)
SetFilterMTMode("SmoothCustom", MT_NICE_FILTER)
SetFilterMTMode("SmoothTools", MT_NICE_FILTER)
SetFilterMTMode("SmoothLevels16", MT_NICE_FILTER)
SetFilterMTMode("SmoothTweak16", MT_NICE_FILTER)
SetFilterMTMode("SmoothCurve16", MT_NICE_FILTER)
SetFilterMTMode("SmoothCustom16", MT_NICE_FILTER)
SetFilterMTMode("SmoothTools16", MT_NICE_FILTER)
SetFilterMTMode("TDeint", MT_MULTI_INSTANCE) # Mode 1 creates artifacts
SetFilterMTMode("yadifmod", MT_NICE_FILTER)
# SetFilterMTMode("yadifmod2", MT_NICE_FILTER) # Starting from v0.0.4 this plugin will self-register the apropriate MT mode
#########################################
# Filters from MVTools v2.6.0.5 (from http://forum.doom9.org/showthread.php?p=1386559#post1386559 ) Tested On 2016/03/06
SetFilterMTMode("MDegrain2", MT_MULTI_INSTANCE)
SetFilterMTMode("MSuper", MT_MULTI_INSTANCE)
SetFilterMTMode("MAnalyse", MT_MULTI_INSTANCE)
SetFilterMTMode("MFlowFps", MT_MULTI_INSTANCE)
SetFilterMTMode("MRecalculate", MT_MULTI_INSTANCE)
#########################################
#Filters from EEDI2 v0.9.2 (from http://forum.doom9.org/showthread.php?t=173238 ) Tested On 2016/03/06
SetFilterMTMode("EEDI2", MT_MULTI_INSTANCE)
########################################
SetFilterMTMode("MPP_SharedMemoryClient", 2) # real.finder
SetFilterMTMode("MPP_SharedMemoryServer", 3) # real.finder
SetFilterMtMode("AVISource", MT_SERIALIZED)
#########################################
#keep it the last line please
if (FunctionExists("avstp_set_threads")) {
# this isn't actually optimal, because it will also disable avstp threads if running
# on a single-threaded filter chain
avstp_set_threads(0, 1) #disable threading in dither
}