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

Windows Media Video (VC-1 AP Codec) Support in Pro Tools
For more information, see the following topics:
(Windows Only)
Pro Tools supports the import and playback of Windows Media video files created using the VC-1 Advanced Profile codec. See your Windows documentation for detailed information about Windows Media video.
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Though not prohibited, editing Windows Media video or adding multiple clips to the Timeline can lead to irregular video output performance.