Hello,

I want to report a bug in the latest version of QWebEngine.

First of all, thank you very much for your excellent work!

QWebEngine (6.4.2/6.4.1) is compiled with "-webengine-proprietary-codecs"

Some video are loading, some are not:

• qwe_download (3).mp4 -> not loading/not reading

• qwe_download (2).mp4 -> loading/reading

How to reproduce,

Compile "simplebrowser" example:

Inside commandLineUrlArgument function set "https://www.tiktok.com"

Compile/Launch.

What do you expect:

Scroll down and see all video starting.

What do you see:

Scroll down and some video are not starting.

If you try it with 6.3.1, there is no problem.

All video are working.

Other information

When dropping video inside "simplebrowser" it can happen{*}
[23040:32852:0129/195548.859:ERROR:interface_endpoint_client.cc(691)] Message 0 rejected by interface blink.mojom.WidgetHost{*}

************Trace & dump config file path is: 

'C:\Users\user\AppData\Local\AMDh264Encoder.cfg'************
js: _initMp4Kernel.catch: TT-vCache-7193111449621908742 isDestroy:false _initPromise.isBreak:false Error: no_preload

The file "AMDh264Encoder.cfg" doesn't exist.

Thx for looking into it.

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

Ti-R