When I load a mp4 video, I want to access to different AudioStreams and Captions.
But, after the loaded event the properties AvailableAudioStreams and AvailableCaptionStreams are empty.
I checked that the video contains AudioStreams this way :
CurrentMediaElement = this.MediaPresenterElement.Content as MediaElement;
And the property AudioStreamCount is 2.
Why the properties AvailableAudioStreams and AvailableCaptionStreams are empty?
Aug 26, 2011 at 9:16 AM
Edited Aug 26, 2011 at 9:26 AM
I've got the same issue here with WMV files.
I guess this means I have to populate the version list myself instead of relying on SMF here, or is there anything else to do?
UPDATE: after looking at the source, it's obvious it won't work:
private void UpdateAvailableAudioStreams()
AvailableAudioStreams = ActiveAdaptiveMediaPlugin != null
&& ActiveAdaptiveMediaPlugin.CurrentSegment != null
&& ActiveAdaptiveMediaPlugin.CurrentSegment.AvailableStreams != null
.Where(i => i.Type == StreamType.Audio)
.Select(i => new StreamMetadata
Id = i.Id,
Attributes = i.Attributes
.OrderBy(i => i.Name)
catch (Exception err)
string message = string.Format(SilverlightMediaFrameworkResources.GenericErrorOccurredLogMessage,
SendLogEntry(KnownLogEntryTypes.GeneralErrorOccurred, LogLevel.Error, message);