I had a problem watching an interlaced video just a few days ago (on an nVidia card no less). No software deinterlacing of any sort seemed to work.
The only thing that got it to play correctly was to switch to hardware accelerated decoding, where the GPU handles the deinterlacing.
As for how to adjust the LAV filter settings, unfortunately you can't "out of the box" because MC19 doesn't let you get into the settings. You'll have to download LAV separately, and then create a custom filter chain (using ROHQ as the base) that has the external LAV filter included. Then you can get into the LAV Video settings and enabled hardware accelerated decoding. It sounds complicated but it's not really that difficult actually. It's worth a try, because with just a couple clicks in MC19 you can revert back to regular ROHQ or RO.
It's a hassle for the more advanced users to not have access to the LAV settings, but it's understandable given that a curious but less advanced user could easily bork their LAV settings and make everything unplayable.