VideoPertemuan 03 Matakuliah : L0182 / Web & Animation Design Tahun : 2008
Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • Menunjukkan penggunaan Video pada Aplikasi Multimedia
Outline Materi • Definition • Analog Video • Digital Video • Broadcast Video Standards • Compression • Advantages and Disadvantages of Using Video
Video • Video is a sequence of photographs projected onto a screen with sufficient rapidity as to create the illusion of motion and continuity. • Different kind of movies : • Analog video • Digital video
Analog Video • Analogvideo is the process of taking an audio or video signal (the human voice) and translating it into electronic pulses. • Video information that is stored using television video signals, film, videotape or other non-computer media. • Problems: • Colour blending • Low clarity • Difficult to edit • Offer consumers slow access and limited control in how the product is presented.
Digital Video • Digital video is breaking the signal into a binary format where the audio or video data is represented by a series of "1"s and "0"s. • With their data stored on optical discs or comparable media, digital movies can offer a high degree of control to consumers. Digital movies can be readily searched, manipulated, and reformed by the consumer. • A high degree of interactivity between the product and the user becomes possible.
Analog and Digital Video • Conversion from analog to digital format requires the use on an ADC (Analogue to Digital Converter) • A Digital to Analogue Converter (DAC) can be used to output digital video on analog equipment
Analog and Digital Video Editing • Analogue video editing is a linear process • To find the section you want, you may have to forward or rewind the video tape • To move a section to another place in the sequence you have to either re-record the section onto another tape or physically cut and splice the video tape • Digital video editing can be non-linear process • You can move sections around inside the computer and play those sections back in any order
NTSC United States, Canada, Mexico, Japan 525 interlaced resolution lines 30 frames per second (fps) SECAM France, Eastern Europe 625 interlaced resolution lines 25 frames per second (fps) PAL United Kingdom, Western Europe, Australia, South Africa 625 interlaced resolution lines 25 frames per second (fps) HDTV Six different formats Aspect ratio is 16:9 Broadcast Video Standards
Digital Video File Formats • .MOV signifies Quicktime, an Apple standard. It is playable on Macintosh and Windows machines. • .AVI is a Microsoft standard that is playable on Windows and Macintosh machines. • .MPEG (.MPG) is playable on Unix and Windows machines. Macintoshes can play MPEG, but may have trouble with the audio track. • .RM files are used by RealNetworks streaming. They are playable on Windows, MacOS, and Unix computers. • .ASF files are a Microsoft streaming format, and play on Windows, MacOS, and Solaris. • .WMV files are a Microsoft format used in Microsoft MovieMaker
Compression • Compression is a reversible conversion of data to a format that requires fewer bits, usually performed so that the data can be stored or transmitted more efficiently. • Compressed data, like the folded letter, is not easily read and must first be decompressed, or unfolded, to restore it to its original form. • The greater the redundancy within the data, the more successful the compression of the data is likely to be. Fortunately, digital video contains a great deal of redundancy and thus is very suitable for compression. • A device (software or hardware) that compresses data is often know as an encoder or coder. • A device that decompresses data is known as a decoder. • A device that acts as both a coder and decoder is known as a codec.
Tips for Creating Digital Video • High quality Tape and VCR • minimize noise • Use a tripod • minimize jitter • Minimize movement • Avoid plain or very complex backgrounds • Plain tends to chunkiness • Very complex is difficult to compress
How Video Can Be Used Effectively • Showing physical procedures. Some uses are : • Installing a board in a PC • Adjusting engine timing • Attracting and holding attention. Some uses are : • Advertising products and services • Teaching new skills to busy employees • Presenting scenarios. Some uses are : • Training technicians to respond to equipment malfunctions • Demonstrating possible uses for a product • Analyzing motion. Some uses are : • Body motion to improve athletic performance • Traffic patterns for transportation planning
Advantages and Disadvantages of Using Video • Carefully planned, well-executed video clips can make a dramatic difference in a multimedia project • Video adds visual impact to multimedia applications : • Advantages • Captures interest • Increase retention • Clarifies complex physical actions and relationships • Can incorporate other media • Disadvantages • Is expensive to produce • Requires extensive memory and storage • Requires special equipment • Does not effectively illustrate abstract concepts and static situations