n5105 (Jasper Lake) does not support VAAPI-MADI and VAAPI-MCDI methods. VAAPI-BOB is low quality.
All new Intel CPUs except EHL/JSL can do proper hw deinterlacing. See here. "* EHL/JSL only support BOB DI"
The good news is that you can enable high quality "BWDIF" software deinterlacing. Switch "Deinterlace method" to "Deinterlace", that would enable BWDIF.
This is a lie!
This kind of deinterlacing is complete bullshit.
It looks many much worser than vaapi-motion compensated!
The last intel desktop cpus with best deinterlacing is 10. Gen e.g. Core i5-10400, i7-10700.
The last low power / passive cpus are Gemini Lake / Gemini Lake Refresh (Pentium J5040, N5030, Celeron N4100)
So be careful what u buy, if you want best looking quality with low rescource usage and low power consumption!
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Otherwise ... Intel must only hit a switch and re-implement "Deinterlacing" ![]()