Video

Question 1

Video types?

Answer 1

Analogue- signals (pictures and audio) are converted to digital signals via a video capture card

Digital (just digital ig)

Question 2

Video compression (lossy)

Answer 2

Lossy codecs include: MPEG1, MPEG4 and RealVideo

Question 3

Video (lossless)

Answer 3

MPEG Video

Do not save as much as space as users would with other lossy compression algorithms

Question 4

File size considerations

Answer 4

Video combines pictures and sounds displayed over time

-CD-ROM (Video takes up most of the space in a CD-ROM)

Question 5

Details on frame rate (fps)

Answer 5

A video or animation is made up of frames
Frames => Individual pictures that are put together to create the illusion of movement

Question 6

Typical frame rates

Answer 6

30fps - Screen refresh rate of monitors & TV programs
24fps - Film speed for motion pictures
48fps
Removes motion blur & strobing of fast-moving image
Suitable for 3D motion pictures
Suitable for slow-motion
Appears like an exaggerated version of a TV program shot
Rendered effects looks realistic - The Hobbit

12fps - Cartoon animation speed
8fps - Minimum speed for the illusion of motion

Question 7

Frame rate calculation

Answer 7

No. of Frames = Frame Rate x Time (in seconds)

Question 8

Video formats

Answer 8

The container - Describes the structure of the file
Associates with the file format

Examples of Container
AVI (.avi)
Quicktime (MOV)
WMV (.wmv)
MPEG (Moving Pictures Expert Group)

Question 9

What is the codec?

Answer 9

Ways of ‘coding’ and ‘decoding’ streams
Way of compressing the file to decrease file size, while maintaining quality

Compresses data (and decompresses it when playing it back) so people can store and transmit files with a smaller file size.

Question 10

What are some examples of codec?

Answer 10

MPEG (Moving Pictures Expert Group)
DivX
H.264

Question 11

File format/types

Answer 11

MPEG (Moving Picture Experts Group) - standards consist of different Parts
negatives : it is lossy the data removed cannot be recovered

AVI (Audio Video Interleave) - microsoft

Quicktime (MOV) - apple inc.

MPEG-4 (MP4) - Uses further coding tools with additional complexity to achieve higher compression

Question 12

What should video editing contain?

Answer 12

1. Title
2. Import/Export (clips)
3. Transitions
4. special effects
5. Layers

Question 13

What are some special effects in video editing?

Answer 13

Twisting
Zooming
Rotating
Slow Motion
Time Lapse
Distorting
Chroma-Key
Colour Correction/Colour Contrast/Levels/Hue & Saturation

Question 14

Filters of video editing?

Answer 14

Colour Balance
Brightness
Contrast
Blurring
Morphing