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38 Cards in this Set
- Front
- Back
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Content delivery methods
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1. Film
2. DVD 3. VOD (video on demand) |
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Compression
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involves encoding information using fewer bits than the original representation. Compression can be either lossy or loss-less.
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Lossy Compression
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reduces bits by identifying marginally important information and removing it
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Loss-less Compression
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allows the exact original data to be reconstructed from the compressed data.
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Analog Data
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Wave form - real, continuous, contains an infinite number of points
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Digital Data
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Binary - information, not physical, uses samples
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Film
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Original form of content delivery
(silent, late 1800's-1928 |
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Television
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1950's led to invention of video
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VHS
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1970's/1980's
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DVD
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Digital Video Disc
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Film Data Composition:
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Photo-chemical
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Video Data Composition:
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Photo-electrical
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3 forms of analog delivery:
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1. Film
2. Television 3. VHS |
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3 Forms of digital delivery:
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1. DVD
2. Internet 3. VOD |
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Codecs
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Compression/Decompression
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Pre-production
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Preparations are made for the shoot, in which cast and film crew are hired, locations are selected, and sets are built
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Production
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The raw elements for the finished film are recorded.
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Post-production
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the video/film is assembled by the video/film editor
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Encoding
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Act of going from a master file to a compressed file
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Standard DVD data limit
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4.70 GB
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Info in Codec:
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1. Aspect Ratio - 16:9/4:3
2. Resolution - SD/HD |
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SD Resolution
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720x480
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HD Resolution
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1920x1080
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Frame Rate
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Number of still images being produced each section
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Interlaced Footage
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is a technique where only the odd lines, then the even lines of each frame (each image called a video field) are drawn alternately.
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Progressive Footage
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is a way of displaying, storing, or transmitting moving images in which all the lines of each frame are drawn in sequence.
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18 Fps
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Silent films frame rate
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24 Fps
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Traditional films frame rate
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24p (23.97)
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Progressive - used in movies
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60i (29.97)
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Interlaced video frame rate - 30 frames, 60 fields - reality
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30p (29.97)
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progressive video frame rate
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Generations
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successive copies of data, usually accompanied by a loss of quality
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Master Tape
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Analog storage
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Master File
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Digital storage
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Interframe Compression
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Takes all frames into account
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Intraframe Compression
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Only looks at individual frames
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3 Types of DVD frames:
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1. I Frame - Independent frames
2. B Frame - Bi-directional Frames 3. P Frame - Predicted Frames |
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GOP
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Group of pictures - closed GOP/open GOP
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