Sync and Video : Working with Video in Pro Tools : Windows Media Video (VC-1 AP Codec) Support in Pro Tools : Windows Media Video File Caveats

Windows Media Video File Caveats
The following limitations apply to Windows Media video in Pro Tools.
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Pro Tools cannot open Windows Media video files that require Windows Media File Digital Rights Management (DRM) passwords to view.
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High-resolution Windows Media video files play back accurately at normal speed on the Windows desktop or an external monitor with a qualified DirectShow output device. However, due to processing requirements for VC-1 decompression, Avid cannot guarantee accurate playback of video frames when performing other transport commands (such as scrubbing, looping, and off-speed play).
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Pro Tools does not support Windows Media playback via Avid video peripherals.