What are the minimum requirements needed to play a High Definition video smoothly???

Answer 1

As of the start of 2005, Microsoft recommends a 3.0 GHz processor with 512 MB of RAM and a 128 MB video card for 1080p playback on Windows XP, though there are now commercially available DVD players, like the KiSS DP-600, that will play back WMV HD DVD ROMs in high definition on HDTV sets. The codec has been submitted to SMPTE and is in SMPTE's standardization process with an intent for it to become an official SMPTE standard known as VC-1 in the near-future.

Answer 2

A HD TV.