MediaElement does not work with AV1 Video Extension 2.0.4.0/1.3.20.0

[WHYBBE]

Description

MediaElement does not work with AV1 Video Extension 2.0.4.0/1.3.20.0.

Version 1.3.4.0 is normal.

Reproduction Steps

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:local="clr-namespace:WpfApp1"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        Title="MainWindow"
        Width="800"
        Height="450"
        mc:Ignorable="d">
    <Grid>
        <MediaElement Source="C:\Users\Y\Downloads\01 3d-background-1.mp4" />
    </Grid>
</Window>

Expected behavior

The AV1 video can be played normally using the MediaElement.

AV1 Video Extension

• 2.0.4.0
• 1.3.20.0

Actual behavior

The video shows as blank when playing with MediaElement.

Regression?

No response

Known Workarounds

• Use K-Lite Codec Pack
• Use AV1 Video Extension 1.3.4.0 and lower(But it will update automatically.)

Impact

No response

Configuration

No response

Other information

Sample AV1 Video: https://github.com/user-attachments/assets/bef8d29d-5ab8-47c3-81bd-2857b7c4e7c7

It seems that it can be verified directly using Windows Media Player Legacy.