Video rendering partially

Hello,

I got problem with video decoding on page "https://www.qt.io/" with proprietary codecs.

WebEngine version 5.15.0 -> SHA-1: 387fb9377d61683bcd0f59a637afffdd9a16912c
Recompile with option

qmake C:\qt\qtwebengine -- -webengine-proprietary-codecs

Tested with sample "simplebrowser"
Browser open on page "https://www.qt.io/"

The page is loading without problem, but the video.
It is reading it, but only part of it visible, the is black, like if a polygon part is missing.

In the console, I got 2 messages:

[23500:12780:0819/182413.365:ERROR:mf_helpers.cc(14)] Error in dxva_video_decode_accelerator_win.cc on line 621
js: UF: Pollyfill not needed, skipping.

Hope it will help you to fix it.
Best regards,

Ti-R