epiphany no sound with html5

[Byung-Hee HWANG]

recently, i upgraded to 2.30 gnome desktop.

1. source fetch via csup 
2. pkg_delete -af
3. new building gnome2-light at ports
... 2 days later, i did all upgrading gnome desktop ...

ok, now what i want is seeing html5 video at youtube with epiphany.
When o visit at youtube (www.youtube.com/html5) it seems good. video 
is ok, smooth. But only there is no sound. why? is there a solution?

i would like to get sound at epiphany to enabled html5. help me!

my current system env. 

kernel: FreeBSD 8.0-RELEASE
csup fetch day: 2010-05-14
ports list installed: attached file (pa.lst)

TIA,

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