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Previewing our video project
The Video Sequencer is a great tool to edit and manipulate video footage, but you will quickly notice that it doesn't have any particular area showing a preview of what you have in your project. We can enable a split view of our sequencer with a preview area to help us see the final result.
In the upper-left corner of your Video Sequencer, you will find a button for the View Type that will be set to Sequencer by default. If you change the button to Sequencer/Preview, you will enable the preview window in your Sequencer as shown (Figure 1.4):
Figure 1.4: Video preview
Once you activate the preview, you will be able to see all video footage at the small top division. That is not a new window, but a divided area of your Sequencer.
After you enable the video preview space, you might experience performance issues on your computer. To have a fluid preview in real time, you must use a powerful computer that can handle massive video editing processing. The purpose of that window is to give you an idea about the visuals of your video composition.