[BUG] FFV1 MKV error

[Selur]

According to the debug output, the Vapourynth script crashes after 252 frames.
Looking at the Vapoursynth script:

# Imports import vapoursynth as vs # getting Vapoursynth core import sys import os core = vs.core # Import scripts folder scriptPath = 'C:/Program Files/Hybrid/64bit/vsscripts' sys.path.insert(0, os.path.abspath(scriptPath)) # loading plugins core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/libmvtools.dll") core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/TCanny.dll") core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/SourceFilter/LSmashSource/LSMASHSource.dll") # Import scripts import degrain import validate # Source: 'C:\Users\DSIOMNAINC\Desktop\01_02_davinci (1)-001.mkv' # Current color space: YUV420P10, bit depth: 10, resolution: 3840x2160, frame rate: 25fps, scanorder: progressive, yuv luminance scale: limited, matrix: 709, transfer: bt.709, primaries: bt.709, format: FFV1 # Loading C:\Users\DSIOMNAINC\Desktop\01_02_davinci (1)-001.mkv using LWLibavSource clip = core.lsmas.LWLibavSource(source="C:/Users/DSIOMNAINC/Desktop/01_02_davinci (1)-001.mkv", format="YUV420P10", stream_index=0, cache=0, prefer_hw=0) frame = clip.get_frame(0) # setting color matrix to 709. clip = core.std.SetFrameProps(clip, _Matrix=vs.MATRIX_BT709) # setting color transfer (vs.TRANSFER_BT709), if it is not set. if validate.transferIsInvalid(clip): clip = core.std.SetFrameProps(clip=clip, _Transfer=vs.TRANSFER_BT709) # setting color primaries info (to vs.PRIMARIES_BT2020), if it is not set. if validate.primariesIsInvalid(clip): clip = core.std.SetFrameProps(clip=clip, _Primaries=vs.PRIMARIES_BT2020) # setting color range to TV (limited) range. clip = core.std.SetFrameProps(clip=clip, _ColorRange=vs.RANGE_LIMITED) # making sure frame rate is set to 25fps clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1) # making sure the detected scan type is set (detected: progressive) clip = core.std.SetFrameProps(clip=clip, _FieldBased=vs.FIELD_PROGRESSIVE) # progressive clip = core.std.Crop(clip=clip, left=0, right=0, top=190, bottom=190)# cropping to 3840x1780 # removing grain using MCDegrain clip = degrain.mcdegrainsharp(clip=clip) # set output frame rate to 25fps (progressive) clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1) # output clip.set_output()

The script seem fine to me.
Does the Vapoursynth Preview work when scrolling through frame 250+?

Cu Selur