Hi, we have an Xbox UWP application that streams VoD content over DASH and we noticed recently that it is no longer displaying subtitles / captions. Anecdotally, it seems like this has only started happening as of the most recent Xbox OS update (August 2021).
These captions are read as TimedMetadataTracks within the current MediaPlaybackItem and when debugging the app I can see that the list of TimedMetadataTracks is empty. However, when running the app as a UWP app on a Windows 10 PC, these tracks ARE visible and the captions are displayed as normal.
I've tried playing some test streams using the Adaptive Streaming sample from the Windows UWP samples (https://github.com/microsoft/Windows-universal-samples/tree/main/Samples/AdaptiveStreaming) and it too fails to display captions for DASH streams when run on Xbox. For example, I've tried with the following DASH and HLS samples:
On Xbox the HLS stream displays captions but the DASH one does not. On PC, both the HLS and DASH streams display captions.
Is there an issue with Xbox streaming DASH at the moment? Or is there anything else I could try?