Hi, I tried all solutions at the internet, at last I found the solution for me
I just reset the Media Foundation and now my browser passes html5 h.264 test.
So how you reset Media Foundation;
- Install K-Lite Mega Codec Pack
- Open Codec Tweak Tool
- Select "Fixes" (Under the General Tab)
- Tick the box near the "Reset Media Foundation"
- Apply and close.