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+--- Thread: [BUG] SVT-AV1 + Vapoursynth encode error (/thread-4469.html)
SVT-AV1 + Vapoursynth encode error - andrewschen - 20.08.2026
Tested on Hybrid_dev_2026.08.19-185814 and Hybrid_dev_2026.08.13:
Choose svt-av1 as encoder, load a input file, don't enable any filter in vapoursynth, set an output file, add to queue, start the job, no error happens.
Choose svt-av1 as encoder, load a input file, enable at least one filter in vapoursynth, set an output file, add to queue, start the job, an error like "2026-08-20@22_24_43_7310_03_video crashed: Error: Invalid parameter '--input' with value '\\.\pipe\2026-08-20@22_24_43_7310_03_video' will happen.
One more thing: In Hybrid_dev_2026.08.19-18581, if I enable KNLMeansCL and YUV420 chroma location in Vapoursynth -> Misc -> Script, the script looks like this:
clip = core.resize.Bicubic(clip=clip, format=vs.RGB24, matrix_in_s="709"chromaloc=0, range_in_s="limited", range_s="full")maybe missing comma?
In Hybrid_dev_20260625-152245 it is:
clip = core.resize.Bicubic(clip=clip, format=vs.RGB24, matrix_in_s="709", range_in_s="limited", chromaloc=0)RE: SVT-AV1 + Vapoursynth encode error - Selur - 20.08.2026
Strange, I'm pretty sure I explicitly have code to not use named pipes with SVTAV1 and SVTHEVC.
Will also look at the chromaloc thing.
RE: SVT-AV1 + Vapoursynth encode error - Selur - 20.08.2026
Uploaded a new dev version.
Let me know whether that fixes the issue for you.
Cu Selur
RE: SVT-AV1 + Vapoursynth encode error - andrewschen - 20.08.2026
Yes it fixes the issues.
There's another thing: The "yuv420 chroma location" setting in vapoursynth, sometimes it isn't applied correctly?
for example:
source yuv420p8
yuv420 chroma location left in VS
Filters: SMDegrain (Gimmick YUV444P16) -> KNLMeansCL(plane RGB)
output yuv420p10
result:
# Adjusting color sampling to YUV444P16 for vsSMDegrainGimmick
clip = core.resize.Bicubic(clip=clip, format=vs.YUV444P16, chromaloc=0)
# removing grain using SMDegrain
clip = smdegrain.SMDegrain(clip, tr=1, interlaced=False)
# adjusting color space from YUV444P16 to RGB48 for vsKNLMeansCL
clip = core.resize.Bicubic(clip=clip, format=vs.RGB48, matrix_in_s="709", range_in_s="limited", range_s="full")
# denoising using KNLMeansCL
clip = core.knlm.KNLMeansCL(clip, channels="RGB", device_id=0)
# adjusting output color from RGB48 to YUV420P10 for SvtAv1Model
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, matrix_s="709", range_in_s="full", range_s="limited", dither_type="error_diffusion")I think chromaloc=0 should be in the last line?
RE: SVT-AV1 + Vapoursynth encode error - Selur - 20.08.2026
Hmm,.. I'll look at it.
RE: SVT-AV1 + Vapoursynth encode error - Selur - 20.08.2026
Okay, took me a while to see the problem (I missed that I did add the chroma location, as an argument to a string builder, but miscounted the placements and thus it was not added).
Uploaded a new dev, now like the description says "chromaloc" should be added in both directions of the conversion.
Cu Selur
RE: SVT-AV1 + Vapoursynth encode error - andrewschen - 21.08.2026
Yes, fixed in the newest dev.