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+--- Thread: [HELP] NVEnc failed to parse y4m header (/thread-4381.html)
NVEnc failed to parse y4m header - r3dfx - 02.05.2026
After upgrading today from 2025.11.09.1 to the latest dev build. My jobs started crashing on NVenc encoding. I've tried switching sources and downgraded to latest stable build (2026.03.21.1), but even preview stopped working now! VS editor just dies with such message:
[color=#800000][font=Segoe UI]Failed to get VSScript API![/font][/color]
[color=#800000][font=Segoe UI]Failed to create VSScript handle![/font][/color]Probably the title is somewhat misleading, but that was the initial issue
Debug output
I've made a suboptimal decision of not keeping original .exe to use as a fallback solution...
UPD: looks like Hybrid cooked my windows install somehow
This is what the end of debug file looks now when I try to open any preview. And this is on previously stable 2025.11.09.1
2026.05.02 - 21:21:18_Windows 10 Version 21H2 (64bit)_2025.11.09.1 - level 9: Preview::indexingIsFinished 'VAPOURSYNTHPREVIEW' ignored,..
2026.05.02 - 21:21:18_Windows 10 Version 21H2 (64bit)_2025.11.09.1 - level 9: Got unhandled IPC message: Failed to initialize VapourSynth environment!
2026.05.02 - 21:21:18_Windows 10 Version 21H2 (64bit)_2025.11.09.1 - level 9: Got unhandled IPC message: Failed to initialize VapourSynth environment!
2026.05.02 - 21:21:18_Windows 10 Version 21H2 (64bit)_2025.11.09.1 - level 9: Got unhandled IPC message: Failed to initialize VapourSynth environment!
2026.05.02 - 21:21:18_Windows 10 Version 21H2 (64bit)_2025.11.09.1 - level 9: Got unhandled IPC message: Failed to initialize VapourSynth environment!
2026.05.02 - 21:21:18_Windows 10 Version 21H2 (64bit)_2025.11.09.1 - level 9: Failed to evaluate the script.RE: NVEnc failed to parse y4m header - r3dfx - 02.05.2026
Well, I have zero clue what happened, but Hybrid fixed itself after complete reinstall with its appdata folder cleaning... I don't like such 'magical fixes', but I accept this positive outcome
I hope that debug log will show what exactly went wrong after my initial non-clean install
RE: NVEnc failed to parse y4m header - Selur - 03.05.2026
probably the same as in the other thread.
Cu Selur