MMT VDO

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Information about MMT VDO
Education

Published on March 3, 2009

Author: apisake

Source: slideshare.net

Text Audio Image/Graphics Video Animation 1

Video 1

It’s everywhere!!! 2

It’s everywhere!!! Cinema 2

TV It’s everywhere!!! Cinema 2

TV DVD VCD It’s everywhere!!! Cinema 2

TV DVD VCD It’s everywhere!!! Mobile Phone Cinema 2

TV DVD VDO VCD Chat It’s everywhere!!! Mobile Phone Cinema 2

TV Internet DVD Streaming VDO VCD Chat It’s everywhere!!! Mobile Phone Cinema 2

TV Internet DVD Streaming VDO VCD Chat VDO on- demand e-Learning It’s everywhere!!! Mobile Phone Cinema 2

TV Internet DVD Streaming VDO VCD Chat VDO on- demand e-Learning It’s everywhere!!! Mobile Phone Cinema ...and Many MORE... 2

Agenda 3

Agenda VDO Fundamental 3

Agenda VDO Fundamental Properties of VDO 3

Agenda VDO Fundamental Properties of VDO Digital VDO Formats 3

Agenda VDO Digital VDO Production Fundamental Properties of VDO Digital VDO Formats 3

Agenda VDO Digital VDO Production Fundamental Record Properties of VDO Digital VDO Formats 3

Agenda VDO Digital VDO Production Fundamental Record Properties of VDO Digital Capture VDO Formats 3

Agenda VDO Digital VDO Production Fundamental Record Properties Edit of VDO Digital Capture VDO Formats 3

Properties of VDO 4

Analog VDO • Motion VDO was originally created and stored in analog form. 5

Digital VDO • A means of reproducing the continuous VDO waveform as a stream of digital numbers. 6

Digital VDO • A means of reproducing the continuous VDO waveform as a stream of digital numbers. various une to nalog t: imm ed to a Benefi attribut ortion as n o i s e . . . dist such 6

Interlacing open wiki to embrace the explanation!! • Interlacing was originally conceived as a way to achieve good visual quality within a limitations of a narrow bandwidth. even field odd field 7

Progressive Scanning (non-interlaced scanning) • A method of representing moving images on a display screen, in which every pixel is represented in each frame. • Computer monitors use a progressive scan. • The standard refresh rate for a flicker-free display is a vertical scan rate of 75 Hz or higher. • It’s used to project movies in theaters. 8

Note in digital TV terminology: interlaced scan is denoted by a lowercase i progressive scan is denoted by a lowercase p frame rate: (60i, 24p) resolution: (1080i, 720p) 9

Flicker Rate • Flicker fusion rate is the human eye’s ability to notice flicker within rapid pulses of light. • Flicker will be observed if a light pulses on and off below 72 pulses per second (pps). 10

Frame Rate • Frame frequency is a measure of how quickly an image device can produce unique consecutive images called frames. (expressed in frames per second - fps) • Typically, the human eye can interpret motion at 10 fps, but this rate causes a flicker effect that’s distract. • Increasing the frame rate reduces flickering. 11

Frame Rate • Movies - 14 fps • Television: • NTSC - 29.97 fps • HDTV - 60 fps • VDO games (frame rate is very important): • action-oriented games - 20-30 fps • 3D-heavy games - 90-100 fps 12

Aspect Ratios • The ratio of the width of the image to its height (w:h) • motion-picture - 1.85:1 and 2.35:1 • tv screens - 1.33:1 (aka 4:3) • HDTV - 1.78:1 (aka 16:9) 16:9 4:3 letterbox 13

Compression • VDO is huge - one sec of analog VDO stored in an uncompressed digital format takes up 1 MB of disk space • thus, 5-min VDO ~ 300 MB • not practical • VDO compression is a MUST • VDO contains many spatial and temporal redundancies • Codecs are needed for creating and viewing 14

Digital VDO Formats 15

AVI • Most common AV data on Windows • Can be saved in a variety of compression schemes - full frames (uncompressed), Radius’s Cinepak, Intel Video, and Indeo. 16

MOV • Quicktime Movie was developed by Apple Computer • MPEG-4 • Qt 7 use H.264 17

MPG • The compressed VDO file format for standard DVD using the MPEG-2 encoding standard • A large file can be transferred to MPEG with little loss of quality while dropping the bit rate a great deal 18

• The MPEG group develops the standards for encoding VDO and audio • MPEG standards: • MPEG-1: used as VCD standard (MP3 is the popular compression) • MPEG-2: use in many things such as DVD, digital satellite TV and so on • MPEG-4: support 3D content, low bit-rate encoding, support for Digital Right Management 19

Others • WMV • a part of Windows Media framework • used for streaming VDO over the internet • uses MPEG-4 standard • RM • a multimedia container with RealVideo and RealAudio codecs in a single file • is used to stream AV over the internet 20

VDO Production 21

Equipments • Digital tapeless (D) • HDV (D) • DV (formerly DVC) • 8mm (A) • VHS (A) 22

Connecting Recorder to Computer 23

Coaxial • VDO and audio signals are both carries in one cable • Poorest transfer 24

A/V • Use RCA connectors • Yellow is (composite) video • Red is right audio & White is left audio 25

S-Video • Separate video - transmit VDO signals over a cable by dividing the VDO info into 2 separate signals: color (chrominance) and brightness (luminance) • Sharper than composite VDO • must be used in conjunction with audio cables 26

USB • USB 2.0 are common • 480 Mbps 27

FireWire • Developed by Apple Computer • IEEE-1394 standard • 400 Mbps • higher transfer rates are available (800, 1600, and up to 3100 Mbps) 28

Transferring from Recorder to Computer • Calculate disk space (uncompressed): • (pixel width) x (pixel height) x (color bit depth) x (fps) x (duration in secs) / 8,000,000 • say, 3-min VDO @ 15 fps, 24-bit depth, 320x240 pixels will take: • (320) x (240) x (24) x (15) x (180) / 8,000,000 = 622 MB 29

VDO Editing • Editing: • cut and paste sections • add special effects • add transitions • add titles 30

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