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Computer Graphics Imaging Ying Zhu Georgia State University

Learn how to use the Video Sequence Editor (VSE) in Blender to combine multiple videos, images, and audio files, apply effects, edit strips, and render your final video sequence. Includes alternative software options.

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Computer Graphics Imaging Ying Zhu Georgia State University

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  1. Computer Graphics ImagingYing ZhuGeorgia State University Lecture 30 Video Sequence Editor

  2. Video Sequence Editor • You can combine multiple videos, images, and audio files in Video Sequence Editor (VSE) • VSE also provides some pre-defined effects

  3. Video Sequence Editor • Choose “Video Sequence Editor” from Window Type menu • Press Space bar (or click on “Add” menu) to add video, images, audio, scene, etc. • Adding a “scene” means that you can combine the 3D scene in your current Blender file with other video or image files • The “scene” strip can be quite slow in VSE (especially if physics simulation is involved)

  4. Video Sequence Editor • Horizontal axis: time (in seconds or frames) • Press T to switch between seconds and frames • Vertical axis: channels • Press Ctrl+Alt+M to add markers along the horizontal axis • Press Ctrl + M to name the marker • Can be used to add brief notes along the time line

  5. Channels • Each video, image, audio, or scene is displayed as a strip • Each strip is placed in a channel • Strips may overlap • When strips overlap, the strip on a higher numbered channel overrides (or blocks) the strip in a lower numbered channel • Unless certain effects (e.g. cross, alpha over) are applied to that time period

  6. Edit strips • Move a strip: • RMB to select a strip, press G to grab it • Resize a strip: • Right click on the left and right arrow key at the ends of the strip • With LMB pressed, move the mouse to resize the strip • Resize a video strip doesn’t mean the video will be speeded up or slowed down • If a video strip is shortened, the video simply cuts off at the end of the strip

  7. Edit strips • Cut strip • Move the green vertical line to mark the current frame • Press K to cut the strip into two at the current frame • Create Meta Strip • Select multiple strips • Press M to make a Meta Strip • A Meta Strip is a group of strips that move together • Press Alt+M to undo a Meta Strip

  8. Edit strips • There are many more strip operations in the “Strip” menu in VSE window

  9. Editing strip parameters • Open two windows • A Video Sequence Editor • A Buttons Window • Select a strip in VSE window • In the Buttons Window, select “Scene” (F10) panel, and click on the “Sequencer buttons” icon • Or press F10 twice • You’ll see a “Edit” tab with parameters for that strip

  10. Image preview • Open two VSE windows • In one VSE window, select “Sequence” in the “Image Preview” menu (the default) • In the other VSE window, select “Image Preview” • Press Alt + A (or drag the green vertical line) to play the video sequence • The video will be displayed in the “Image Preview” window

  11. Effects • In VSE window, select one or two strips, click on “Add” menu, select “Effect” • An Effect is displayed as a strip • How to edit the parameters of an Effect strip • Select the effect strip • Open a “Buttons Window” • Go to “Scene” panel, click on “Sequencer buttons” icon • Edit the parameters in the “Effect” tab • Note that the tabs may be stacked on top of each other. You may need to drag the tabs to separate them

  12. Effects • Blender provides a number of effects • Cross: make one video sequence cross into the next one • Alpha over/under: superimpose an image (or video) above/under another video • Glow: make the video glow • Speed control: speed up or slow down the video • Adjust the “Global Speed” in the Effect tab • and there are more effects …

  13. How to render video sequences? • When you are done with video sequence editing, you can render the video sequences into a final video file • In Buttons Window, Scene (F10) panel, “Anim” tab, press “Do Sequence” button • Adjust Start and End frames • Select Format and Output directory • Press “ANIM” button

  14. Reverse frames • Sometimes you may want to render a video strip with frames reversed to create some special effects (e.g. spilled water goes back to the cup) • Select the strip (by right clicking) • In Buttons Window, “Scene” (F10) panel, click on the “Sequencer buttons” icon, in “Filter” tab, press “Flip Time” button

  15. Alternatives to Blender VSE • Microsoft Windows Movie Maker • Free • Allows you to make titles and credits • Provides plenty of video effects and video transitions • Adobe Premiere • Adobe After Effects • Apple’s Shake

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