Based on the provided information, I am not sure under what circumstances is the issue present. Could you elaborate more on what is the connection between the web link and the MediaPlayer widget?
Also, could you examine the live demos and let me know in case I could replicate the defect there? Here is an example of a video that starts with the sound turned on:
In case the issue persists, it would be very helpful if you could provide a sample that I could investigate locally.