In case the video doens't start:

On the left side of the current link in your browser on your computer,
for Firefox (pictures on the right):
1.left click on the crossed play symbol and enable auto play setting for audio and video
2.press f5
for Chrome (pictures on the left):
1.left click on the lock symbol and press website preferences
2.scroll to sound /audio and select 'enable'
3.go back and press f5