Using the Quicktime API on Windows, there doesn't seem to be any API exposed to enable hardware acceleration. If you open movies with the Quicktime app, DirectX acceleration can be enabled by use of the GUI under the Edit/Preferences/QuickTime Preferences/Advanced Tab. Is it possible to pass a DirectX surface or similar to get H/W acceleration from the API? Performance through the API is much lower than the native app, so I suspect there might be some undocumented API or similar. Anyone have any ideas?