I asked this some time ago:
Thread
Does Matrix on a Raspberry Pi4 have MPEG2 Hardware Acceleration with Hardware Deinterlacing and Sync Playback to Display?
Hi,
does Raspberry Pi4 with Kodi v19 (Matrix) have MPEG2 Hardware Acceleration with Hardware Deinterlacing and a working "Sync Playback to Display"?
On Amlogic Sync Playback to Display isn't working anymore so i want to switch to Pi4.
A clear "NO" would've been better than "Both settings exist for RPi4B". 
Now i have orderd a PI and i can't use it. 
I'm waiting and waiting and waiting for a perfect Kodi Device with Deinterlacing (Image Quality should be compareable with AMDs Vector Adaptive Deinterlacer), PAL Speedup (24p to 25p to match 50hz) and maybe Upscaling like madVR's NGU.
Maybe you Libreelec Admins and Devs should talk about this with the Raspberry Developers when they start to Design the "PI 5/PI 500" !!!