VDPAU advanced x1 & x2 de-interlacing do not appear to function properly with driver 375.26 on GTX1050ti.
BOB & temporal DI look as expected (okay).
Playback shows interlaced combing artefacts with mpv & MythTV.
VDPAU trace/debug logs show no errors & look to show expected function calls.
Recordings are typical broadcast H264 1080i50.
Have tried i60 video files & other refresh rates with no success.
Scaling in GPU from 1080 to 2160 (4K) or just 1080 output makes no difference.
Same driver (375.26) on GTX650 playing the same recordings with 2x Adv. DI VDPAU looks okay/good.
Driver 340.xx on GT240 playing the same recordings with 2x Adv. DI VDPAU looks okay/good.
IMO appears that the GTX1050ti firmware/hardware is the problem.