MPC-HC: How to get smoother playback of VC-1

[Analytic]

Hi Folks,

When I try to play VC-1 encoded video in m2ts or mkv files with MPC-HC (1.5.2.3456 x64), the motion is jerky and with the m2ts files in particular, frames appear to be missing at equally spaced intervals.

[I have to use the VMR or Haali output modes because EVR CP doesn't play -- I guess due to MPC DXVA limitations on my system.]

Is there any way to make the VC-1 playback smoother? I am not seeing the problem with other codecs. Also, the original Blu ray DVD plays fine with no motion problems at all when I use the Cyberlink-based DVD player software that came with my HP notebook.

I see the problem regardless of how the m2ts file is created -- for example, either from an ISO clone with DVDFab 8.1.0.5 or as a copy with AnyDVD HD 6.8.4; the mkv file was in turn coverted from those. I've also encountered the problem with VC-1 videos from other sources.

I am running Windows 7 Pro SP1 64bit on a quad core HP Pavilion dv8 notebook with 8GB ram and NVIDIA Geforce GT230M adapter.