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March 01, 1996 12:00 AM

Non-Linear Digital Video Editing on Windows NT

Windows IT Pro
InstantDoc ID #2420
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Speed Razor Mach III
Speed Razor Mach III, from in:synch, is part of a new category of software for NT that allows you to edit and manipulate video and audio sequences. If you're looking for a real video post-production editing environment, you'll want to take a look at it.

All the elements you'll use in your production are stored in the Razor Library. These elements include video and audio clips, graphics, transitions, and effects.

Razor has a batch-import feature and you can collect your elements with it. To do batch capture, you'll need a pro or semi-pro video deck with an RS-422 port, a free serial port on your computer that's fast enough to handle a high-speed modem, and an RS-232 to RS-422 cable. You enter SMPTE in-and-out points for each clip you want. (This is a method of time-stamping video or audio tape for synchronization purposes as defined by the Society for Motion Picture and TV Engineers.) You then hit a button and Razor controls both the video deck and the PVR, grabbing the footage you've selected.

This has some practical uses. Let's say you've spent the week shooting footage for a training video, and you've made a window dub of your BetacamSP footage onto a VHS tape. (A window dub is a copy that shows the time-code in a window that is superimposed on top of the video.) You go home and pop the tape into your VCR. When you see a scene you like, you write down the time-code numbers where you want the scene to begin and end. When you get back to work, you can enter the in-and-out points in Razor and let it grab the footage from your BetacamSP master tape.

At the start of a project, you load up the elements you plan to use, then you work with them in the Composition Window (see screen 1). The Composition Window is essentially a time-line that lets you stack an infinite number of audio and video tracks and shuffle your elements quickly and easily. You drag-and-drop a video clip onto the time-line: If you want to move an element, simply drag it to the new position. This process is much simpler than traditional video editing, where one change might mean you have to change the rest of the show.

Another important part of any editing system is the variety of transition effects it offers. Razor may handle transitions with a plain-looking interface, but it gives you a surprisingly large range of possibilities. For example, Razor gives you complete control over every parameter of the popular wipe effect (where one video source replaces another), including angle and the amount of edge softness. You can save any transitions you create as presets.The more ambitious can create custom Matte Transitions with the luminance values of a .BMP image to determine how video images replace one another.

Razor has a number of special effects, including color-correction, embossing, cropping, and blurring. Once again, Razor gives you an impressive amount of control over parameters. The Orientation effect is particularly versatile: You can use it as either an effect or a transition. Orientation allows you to resize, rotate, and even spin the video in 3D space. You also have the ability to key or superimpose images, including the "weather announcer"-style blue-screen effects.

Razor includes a character generator because you always need to add titles to your video. The character generator, like the wipe generator, has deceptively simple controls. You can specify font, size, color and text justification, and create scrolls, crawls, and drop shadows.

Final Choices
If you're an animator with an Alpha machine that uses software such as LightWave 3D or SoftImage, you'll want PVR for outputting animations. The operation is simple and the image quality is outstanding. Razor adds quite a bit of power to your PVR setup, but does it really replace a traditional editing suite? If your videos consist mainly of long shots, such as speeches or wedding videos, then a non-linear video setup might not be your best buy. You should consider a couple of video decks and some sort of video titling equipment instead.

Most video today, though, consists of shorter shots that designers edit together with a lot of cool-looking effects and great-looking graphics. If you want to produce that sort of snazzy video, you'll be hard-pressed to beat PVR and Razor with their combination of creative flexibility and top-notch output quality. Maybe it's time to buy that director's chair.

Perception Video Recorder
System Requirements: Intel Pentium or Digital Equipment Alpha CPU, Windows NT Workstation 3.5, 64 MB of RAM, dedicated audio/video hard drive
Contact: Digital Processing Systems * 606-371-5533
Price: $2995
Speed Razor Mach III
System Requirements: Intel Pentium or Digital Equipment Alpha CPU, Windows NT Workstation 3.5, 64 MB of RAM, dedicated audio/video hard drive
Contact: in:sync * 301-320-0220
Price: $1499
Testing Platform
Aspen Systems Telluride: 275-MHz Alpha AXP21064A, 64MB of RAM, 1GB SCSI-2 hard drive, Imagine 128 PCI video card, Micropolis 4GB SCSI-2 A/V hard drive

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