Disaster with wrong MPlayer

[Selur]

First I loaded the avs, clicked support Avisynth + Filter View and got preview but no Tweak effect.

Looking at the preview script from that is used in avsViewer:

#  input color sampling YV12
#  input luminance scale tv
Source = Import("/tmp/convert/merged-mp4-test.avs")
# current resolution: 1024x576
SourceFiltered = Source
# deinterlacing
# filtering
# color modifications
# Current color sampling before 'Tweak' is 'YV12'
# Supported color samplings for 'Tweak' are: 'YUY2, Y8, YV411, YV12, YV16, YV24'
SourceFiltered = SourceFiltered.Tweak(sat=2.00)
# adjust color to(2): RGB32
SourceFiltered = SourceFiltered.ConvertToRGB32(matrix="Rec709")
Source = Source.ConvertToRGB32(matrix="Rec709")
StackHorizontal(Source, SourceFiltered)
return last

Tweak gets applied to the right side only, conversion to RGB32 is done since the preview is always RGB and to make sure the right Matrix is used for that conversion this is done in the Avisynth script.
-> Looks fine to me, no clue why you can't see the effect. Works fine here.

Why convert to RGB32 twice

Once for the filtered and once for the unfiltered source.

I never called Bicubic resize. It should be Spline36 ??

Not sure that you are referring to, I don't see any resizing in this script at all,...

Cu Selur