vapoursynth

Bug fixes

r50:
updated zimg to latest v2.9 so grayscale colorspace are supported
fixed several minor issues related to path handling in vsrepo
added version and api_version to python module to make detecting version mismatches easier
improved rounding in averageframes (sekrit-twc)
fixed averageframes not properly rejecting more than 31 weights or nodes
fixed crash in textfilter line wrapping introduced in r49 (sekrit-twc)
fixed regression introduced in r48 where expr, sobel and prewitt wouldn't clamp 9-15 bit output to valid range (sekrit-twc)
fixed crash due to null pointer dereference when instantiation many vapoursynth classes directly in python
fixed regression in r49 where the python dll could only be located when in the PATH on windows

Bug fixes only

r49:
updated to python 3.8 on windows
updated visual studio 2019 runtime version
updated zimg and added support for spline64 resize method
fixed transfer characteristics not being applied to gray format clips (sekrit-twc)
fixed vdecimate bugs when compiled on systems where char is unsigned by default
fixed a regression introduced in r48 in that could sometimes cause corrupt output from expr on cpus without sse4.1 (sekrit-twc)
fixed a savestring bug in avscompat (sekrit-twc)
interleave, selectevery and separate fields now have a modify_duration argument to determine if they modify frame durations and fps
addborders and crop now update the _fieldbased attribute properly when an odd number of lines are cut from the top
fixed add to path not working for single user installs
fixed compilation on non-x86 systems
fixed an infinite loop in the expr filter optimizer that was introduced in r48 (sekrit-twc)

Lots of AVX2 optimizations