Public bug reported:

uname -a
Linux adiance 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:34 UTC 2020 
x86_64 x86_64 x86_64 GNU/Linux

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:        18.04
Codename:       bionic

inxi -G
Graphics:  Card: Advanced Micro Devices [AMD/ATI] Oland [Radeon HD 8570 / R7 
240/340 OEM]
           Display Server: x11 (X.Org 1.19.6 ) driver: radeon Resolution: 
[email protected]
           OpenGL: renderer: AMD OLAND (DRM 2.50.0, 4.15.0-88-generic, LLVM 
9.0.0) version: 4.5 Mesa 19.2.8

For 1080i H.264 and VAAPI - bob deinterlacing, i have halfscreen  (top)
compressed image.

To solve the default, i have to revert via synaptic the package mesa-va-
driver to 19.0.8.

Other solution is to take nighty builds as complete mesa package via : 
https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers   that works too 
and is at mesa 20.1 git

Please correct the problem to the official Ubuntu repos.

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New

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which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1867188

Title:
  Mesa 19.2.8 and VAAPI - bob -> only half screen picture for 1080i
  H.264

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