MediaPlayerElement cannot display text in subtitles

[qian-o]

Describe the bug

WinUI:

Steps to reproduce the bug

1.Create a MediaPlayerElement control.
2.Create a MediaSource and add a TimedTextSource instance to ExternalTimedTextSources.
3.The Source property of the MediaPlayerElement binds to the MediaSource

Expected behavior

No response

Screenshots

No response

NuGet package version

Windows App SDK 1.2.1: 1.2.221116.1

Packaging type

Packaged (MSIX)

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

Visual Studio 2022

Additional context

No response

[Loganeek]

It seems the problem of the default caption style.

Try:

1. Go to "Settings > Accessibility > Captions > Caption style > Edit".
2. Change the text effects "None" to "Uniform" or others.

before	after

It works for me.

[qian-o]

Thank you for your response, but I have already found an alternative to MediaPlayerElement.

[softworkz]

Here's a non-programmatic solution. When you merge this REG file, it will add a captioning theme with empty configuration, named "Controlled by Application" and sets it as active.

After that, all subtitle styles are controlled by the application again (TimedTextStyle).

WindowsCaptionsDefaultProfile.zip

[DmitriyKomin]

@qian-o, thank you for reporting the issue. I can confirm CC text is not rendered when Effects is set to None or Drop Shadow (but does render with Raised/Depressed/Uniform). This is a regression from the initial WASDK preview release containing MediaPlayerElement (1.2.220902.1-preview1). I will continue investigating this further.

[softworkz]

I will continue investigating this further.

@DmitriyKomin - no need. I did all the work already: #9126