Save Speech Synthesis Stream as Audio in Windows Phone 8.1

In Windows Phone 8.1 you can generate a SpeechSynthesisStream using text to speech. We earlier tipped you on
Using text to speech in Windows Phone 8 and 8.1
You can use the output SpeechSynthesisStream and save it as a .wav audio file in app’s local storage.

Note

This is not the best method to save the speech stream to audio as it takes a long time to get processed.

Sound off in comments/forums if you find a workaround.

UPDATE: We just found another method to do it and it seems to be quite faster. The sample Transcoding media project uses Windows.Media.Transcoding API to transcode a media file in a Windows Store app.