Adding keyframes to the video bus track is just like working with any other video track. Use video bus track keyframes to animate video output effects.

You can add fade-to-color, motion blur amount, and video supersampling envelopes to the video bus track to affect your video output.

Adding and editing a fade-to-color envelope is just like adding an envelope on a standard video track, but it affects all tracks.

Motion blur can help you make computer-generated animation look more realistic. For example, if you use track motion or event pan/crop to move a clip across the frame, each frame is displayed clearly when no motion blur is applied. Turning on motion blur adds a motion-dependent blur to each frame to create the appearance of smooth motion in the same way a fast-moving subject is blurred when you take a photograph with a slow shutter speed.

1. Right-click the video bus track, choose Insert/Remove Envelope from the shortcut menu, and then choose Motion Blur Amount from the submenu.

2. Edit motion blur automation settings:

3. Add and adjust envelope points as necessary to set the time interval that will be used for blurring. Increasing the value emphasizes the blur effect. For example, setting the envelope to 0 means no blurring will occur; setting the envelope to 1 second means that each frame will be blurred for one-half second before and after the frame.

—or—

• Click the Automation Settings button and select Show Automation Controls. The Motion Blur slider handle is displayed as a .

  The Motion Blur slider behaves differently if the track has a composite level envelope and when you change the track automation recording mode:

3. The motion blur envelope affects all tracks. To bypass motion blur for a track, select the Bypass Motion Blur button in the track header.

4. To change blur type, choose a setting from the Motion blur type drop-down list on the Video tab in the Project Properties dialog. This setting determines the shape of the blur and the opacity of the frames.

Adding a motion blur envelope significantly increases your rendering time.

Video supersampling can improve the appearance of computer-generated animation by calculating intermediate frames between the project’s frame rate, allowing you to create smoother motion blurring or motion from sources such as track motion, event pan/crop, transitions, or keyframable effects.

The effect of video supersampling is less apparent with video that contains fast motion, and supersampling cannot improve the appearance of existing video.

1. Right-click the video bus track, choose Insert/Remove Envelope from the shortcut menu, and then choose Video Supersampling f
   rom the submenu.

2. Edit automation settings:

3. Add and adjust envelope points as necessary to indicate how many frames will be calculated between frames (using the project’s frame rate) to create the blur.

—or—

• Click the Automation Settings button and select Show Automation Controls. The Supersampling slider handle is displayed as a .

  The Supersampling slider behaves differently if the track has a supersampling envelope and when you change the track automation recording mode:

Video supersampling significantly increases your rendering time. For example, when you set the video supersampling envelope to 2, twice as many frames are rendered than would be rendered without supersampling. Adjust the envelope to apply supersampling only where necessary.

Click the Video Output FX button in the bus track header to add or edit video output effects. If there are no video output effects, clicking this button displays the Plug-In Chooser. If you’ve already set up video output effects, clicking the button displays the Video Output FX window.

Click the Mute button to mute the video output. To unmute the video output, click the Mute button again.

Muting or unmuting a bus track

1. Click the Automation Settings button and verify Show Automation Controls is not selected.

2. Click the Mute button .

Adjusting mute automation

You can edit mute automation settings by adding a mute envelope to the track or by using the controls in the track header.

1. Click the Automation Settings button and select Show Automation Controls. The Mute button is displayed as .

2. Click the Mute button to change the bus track’s mute automation state.

   The button behaves differently if the track has a mute envelope and when you change the track automation recording mode:

3. When the track automation mode is set to Off, the button mutes the entire track.

4. When the track has a mute envelope and the track automation mode is set to Read, the button changes state to reflect the envelope setting during playback but cannot be adjusted.

5. When the track has a mute envelope and the track automation mode is set to Touch or Latch, the button edits the envelope setting at the cursor position.

Click the Bypass FX and Envelopes button in the bus track header to bypass all video output effects and bus track envelopes.

You can drag the horizontal splitter between the track list and bus tracks to increase or decrease the space allocated to bus tracks. Perform any of the following actions to resize individual bus tracks:

• Drag a bus track’s bottom border to set its height.

• Click Minimize to minimize a track vertically.

• Click Maximize to zoom in vertically so a bus track fills the lower portion of the timeline.

• After minimizing or maximizing a bus track, click the Minimize or Maximize button again to return a bus track to its previous height.

• Press Ctrl+Shift+Up/Down Arrow when the bus track area has focus to resize all bus tracks at once.