Many DVDs containing 3D video titles are commercially available. This type of disk is described as High-Quality Field Sequential (HQFS), Field Sequential 3D or Interleaved 3D. A list of known titles can be found on the website: 3-D DVDs.
TriDef 3D Media Player can play those DVDs, but you need to press D to set the DVD input mode to any of the following:
2D
3Di (left)
3Di (right)