User Manual
VIDEO MIXER
The VIDEO center panel offers video mixing controls as well as the most commonly used controls from the Audio Mixer such as GAIN, Volume Faders, Audio Crossfader and PFL selection buttons (see Audio Mixer).
By default the Video Mixer displays a simple Single Source interface to provide visualizations when there is no video available to play. In this view there is a Video preview window for the Master Output, Video Source and Video Effect menus.
When a video gets loaded to a deck, the Video Mixer interface changes to a Multi Source view which offers additional functions such as Deck preview windows, a Video Crossfader, Transition controls and Video Effect controls.
Single Source View
- Master Output Video Preview - This window displays the Master Video Output. Clicking inside this window will enable/disable the Video engine and Master Video Output. When enabled, a small external video window will open that can be used to monitor the video or it can be dragged to a second monitor and made full screen by double clicking it once in the desired position.
Both the Master Output Video Preview and External Video screens have additional right click options that can be used to customize the video display experience for both you and your audience. 
Off Turns off the Video Engine Fullscreen: Maximizes the Video Output to full screen on the selected video card Windowed Displays the video output in a smaller window Preview Only Displays the video output in the Video Preview but not to the Master Video Output Use videoSkin Displays the chosen Video Skin to the Master Video Output for audience viewing Show videoSkin on preview Displays the chosen Video Skin to the Master Video Output Preview for the DJ's reference - Video Source - This section provides Audio Only Visualizations that can be selected when using a track selection with no video element. This ensures that there is always a visual on screen even when a video file is not available for playback. By default VirtualDJ is equipped with the most commonly used sources:
Cover VirtualDJ will display the album cover of the song playing Camera VirtualDJ will display a video feed from your computer's camera or external webcam Shader VirtualDJ will display animated visualizations (Shaders). A short list of Shaders are included, but more can be added. See here for more details. Slideshow VirtualDJ will display a slideshow of pictures from any folder you designate - Video Effect - This drop down menu provides a wide range of various Video Effects. Clicking on the down arrow will open the list of available effects, while clicking on the text will activate them.
Multi Source View
- Master Output Video Preview - This window displays the Master Video Output. Clicking inside this window will enable/disable the Video engine and Master Video Output. When enabled, a small external video window will open that can be used to monitor the video or it can be dragged to a second monitor and made full screen by double clicking it once in the desired position.
Both the Master Output Video Preview and External Video screens have additional right click options that can be used to customize the video display experience for both you and your audience. 
Off Turns off the Video Engine Fullscreen: Maximizes the Video Output to full screen on the selected video card Windowed Displays the video output in a smaller window Preview Only Displays the video output in the Video Preview but not to the Master Video Output Use videoSkin Displays the chosen Video Skin to the Master Video Output for audience viewing Show videoSkin on preview Displays the chosen Video Skin to the Master Video Output Preview for the DJ's reference - Deck Video Preview - These windows display the video output of the left and right decks. Clicking on either of these windows will perform a video transition to the specified deck.
- Transitions & Effects - These drop down menus provide a wide range of various Transitions (to move seamlessly from deck to deck), Video Effects and Visualizations. Clicking on the down arrow will open the list of available plugins while clicking on the text or toggle switch from the menu will activate/deactivate them. The 4 Deck Interface has a GUI button on each side to quickly open and dock the Transition or Effect GUI to the right side of the browser.
When the Transitions and Effects menus are open, they can be Pinned open by using the Pin icon at the top, activated or docked to the browser area using the gear icon to the left of the chosen transition or effect.
(See Effects for more detailed information.)
transitions
VirtualDJ has a large selection of natively installed Transitions from the dropdown menu. Transitions can only be used one at a time and selected by clicking on them from the drop down, or activated/deactivated by using the toggle switch beside each transition.
At the bottom of the transition menu is an option for (Single Source). Clicking on this option will return the interface to the Single Source View.
video effects
The Video Effects dropdown menu is divided into 3 sections: - Overlays
- Transforms
- Source for audio-only tracks
- Video Crossfader - Used to mix the Video Output of the decks. If the Video Crossfader is at the far left or right side, only the Video from that deck will be displayed on the Master Video Output. At any other position, the Videos will be mixed depending on the selected Video Transition. Double Clicking the Crossfader will bring it back to the center position.
On each side of the Video Crossfader there are additional buttons to control how it behaves in relation to the Audio Crossfader:Auto The Video Crossfader will automatically follow the deck that the audience is hearing. Link The Video Crossfader will follow the Audio Crossfader so that both are controlled with one fader. 
In 4 Deck mode, the video crossfader assign buttons can be used to assign a deck as left or right side to the video crossfader. If none are selected, the selection will automatically follow the left and right decks as selected from the relevant buttons on each deck (Auto mode). Right-click on any of the buttons to return to auto mode.
Video effects can be activated by clicking on the text in the video effects box or by using the toggle switch to the left of each effect from the drop down menu.
For a complete list of effects, transitions and visualizations included in VirtualDJ, please see the List of Native Effects.
A large collection of User Created Custom Transitions and Video Effects are available for licensed users at http://www.virtualdj.com/addons/effects
Please visit the following link to learn how to install a Custom Effect:
http://www.virtualdj.com/wiki/Install%20Plugins
For a complete guide and to learn more about mixing video, please see: http://www.virtualdj.com/wiki/VideoMixing.html Scratch mixer