Sync and Video : Working with Video in Pro Tools : Video Track Controls and Indicators : Video Track View

Video Track View
The video track can be viewed in Frames View or in Blocks View, both of which display all video clip boundaries and metadata. Video frame images are displayed only in Frames View.
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When switching from Blocks mode to Frames mode during playback, the video track will not update to displaying frames until playback is stopped.
To set the view for the video track:
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On the video track, select Frames or Blocks from the View Options pop-up menu.