@renlan: Do you have v2 of WDTV (not WDTV Live) na?
See
iboum.com : Future Entertainment Technology : WDTV (mk2).
WDTV (mk2)
Just to confuse us all, Western Digital have released a new version of the WDTV. They followed the tried and tested Western Digital launch method from the WDTV Live, and just left a couple in some shops one day hoping both retailers and customers would figure it out.
The new WDTV (mk2 / gen2) uses the same packaging as the original WDTV but is in fact a cut down WDTV Live, using the new Sigma 8655 chip. It also lacks the component output from the Live.
The main feature addition compared to the WDTV mk1 is DTS downmix and other HD-Audio compatibilities whilst the Sigma 8655 chipset makes this one of the most powerful Media Players at any price. The same limitation as the Live are apparent here too, so no DVD-ISO or RMVB support.
The product numbers on this new box are WDBABG0000NBK-EESN / WDBABF0000NBK-NESN and the packaging will be marked 'DTS2.0' and HDMI 1.3'. If you are looking to buy either this or the old WDTV be very careful you get the right version by cross-checking with the product numbers above. Stock is now plentiful for this new model. Amazon ( $99.00, C$135.35, £76.70) have stock with free shipping.
The WDTV Live is priced only $20 higher than this model. We feel that unless you are on a very tight budget or are absolutely sure you will never need networking or a component output, then the Live is the better value. There is however no doubt that this new WDTV is a fantastically capable machine.
Also check out
WD HD media player with model number WDBABG0000NBK-EESN has DTS 2.0 downmix - AVS Forum for reference pics
One of the reference pics

Notice the difference in packaging...
Edit/Add:
Also the WDTV v2 has the following model numbers:
From
Specifications for the WD TV HD Media Player device
Specifications for the WD TV HD Media Player device
Order/Model Number PAN AMERICA (NTSC): WDBABF0000NBK-NESN
Order/Model Number COSTCO (NTSC): WDBABF0000NBK-NECS
Order/Model Number JAPAN (NTSC): WDBABF0000NBK-JESN
Order/Model Number Multi-City ASIA (NTSC): WDBABF0000NBK-SESN )
Order/Model Number Multi-City ASIA (PAL): WDBABG0000NBK-SESN
Order/Model Number EMEA (PAL): WDBABG0000NBK-EESN
Order/Model Number AUS/NZ (PAL): WDBABG0000NBK-AESN