Manual Ulead MediaStudio Pro 6.0 (page 343 of 360) (English)

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APPENDIX

343

Motion JPEG

The JPEG compression scheme works by compressing each frame in a

video sequence. It is not the most efficient in regard to file sizes, but by

compressing every frame individually, it offers the best quality and is the

scheme of choice for people wanting to output back to video tape or

broadcast. To do this, however, you will need a lot of storage space and a

high-end video capture board that can handle large amounts of data and

low compression ratios, such as 2:1 (every one original frame can be

resized down by half). Once you get up to higher ratios such as 10:1 or

even 100:1, noticeable degradation occurs and you would be better off

using another scheme such as MPEG.

MPEG

MPEG has grown out of JPEG but added more sophisticated interframe

techniques to save only the differences between keyframes – called I

frames. Currently there are two standards: MPEG I and MPEG II. MPEG

I is designed to produce ½ screen (352x240) 24-bit color, 30 frames per

second video running at approximately 170KB per second. MPEG II is

designed for full screen (720x480) 24-bit color, 60 field video running at

anywhere between 500KB to 2 MB per second. MPEG II is set to become

the standard for high quality video playback, particularly over the newer

DVD discs.

MPEG compression is a very memory intensive process and as such

currently requires hardware assistance. While this makes for great looking

video, you will be unable to play it back on any machine that doesn’t have

a similar setup or an MPEG accelerator. As such, MPEG is not suitable for

CD-ROM or Internet playback, (unless you are sure your audience has

support for MPEG), but is ideal for in-house or corporate presentations.

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Ulead MediaStudio Pro 6.0 Manual

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