Tuesday, 20 November 2012
Chapter 14: Digital Video Data Sizing
Digital Video Data Sizing
Data sizing is used for calculating the size of a video or movie. There a some calculation needed to be done before you can determine the size of a data. In order to calculate the size of a video, you must calculate the picture/frame rate of the video and the audio size.
Calculating the File Size of an Uncompressed Digital Video
The formula is as follows
Calculating the File Size of an Uncompressed Audio File
Data sizing is used for calculating the size of a video or movie. There a some calculation needed to be done before you can determine the size of a data. In order to calculate the size of a video, you must calculate the picture/frame rate of the video and the audio size.
Calculating the File Size of an Uncompressed Digital Video
- Raw video data size = frame size (width X height) * frame rate (fps) * colour depth (in bytes) * time (in seconds)
8 bits = 1 byte
1 kilo(bit/byte) = 1,024 (bits/bytes)
1 mega(bit/bytes) = 1,048,576 (bits/bytes)
1 giga(bit/bytes) = 1,073,741,824 (bits/bytes)
The formula is as follows
8-bit mono Seconds x kHz = Size
16 - bit mono (Seconds x kHz) x 2 = Size
8 - bit stereo (Seconds x kHz) x 2 = Size
16 - bit stereo ([Seconds x kHz] x 2) x 2 = Size
16 - bit 5.1 ([Seconds x kHz] x 2) x 6 = Size
Eg. The file size for a 30 seconds of 16-bit, 11kHz mono audio is: (30 X 11) X 2 = 660KB
Factors to consider when selecting graphics to be used in a multimedia project
- Purpose
- Quality
- Cost
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