MKV : HD 1080p DUAL AUDIO Sample VC-1 DDPlus 5.1 + DD 2.0
Long back, I have uploaded few samples, but removed from free hosts.
Someone already uploaded this sample @ techpowerup.

Filename: hddvd_demo_1080p.mkv
MD5 Hash: B2EED5DBCB2A987AA723C36074A711F6 ...

Video:*
VC-1 @ ~20mbps
playback Cyberlink PowerDVD 7.3*or Media Player Classic with Windows Media format 11 installed (VC-1 included i think)
Vista all ready have VC-1 decoder

Audio:
Dolby Digital 2.0 @ 640kbps
Dolby Digital Plus 5.1 @ 640kbps
Play Dolby Digital 2.0 with AC3Filter

Container:
Matroska (mkv)*( http://matroska.org/)
use Haali media Splitter

May be useful to developers, encoders or rippers in many ways.
Many thanks to Original Uploader.