Weird Custom Cut Error

[Goose]

Installing LAV filters should solve your issue, it adds support for MKV and also the H.265 directshow codec. We’re looking at replacing FFDShow with LAVFilters in the next release

Releases · Nevcairiel/LAVFilters

Are Haali and FFDShow required on Windows 10?

They won’t help or hurt on Windows 10 since they’re way down in the priority list for DirectShow codecs and most of the codecs in FFDShow are already there in Windows 10 natively at a much higher priority. I had responded to your other message, the issue is that Windows 10 doesn’t support H.265 natively so Custom Cuts can’t load the files with h.265. You can try using a different codec pack that adds support for H.265 to windows direct show codecs.