1. Advanced AV Production Practicum Math for The Audio Video Professional Calculating Single File Sizes Copyright © Texas Education Agency, 2015. All rights reserved.

2. Calculating Single File Sizes Objective: Learn how to calculate the file size of a Video Project to determine if the costs of the project will fall within budget guidelines. Copyright © Texas Education Agency, 2015. All rights reserved.

3. Calculating Single File Sizes – Students Will –  Calculate an assortment of file sizes  Understand how file sizes change with content and distribution method.  Demonstrate knowledge of why file data is manipulated  Demonstrate proficiency with math calculations  Learn industry standard aspect ratios, terms and formulas Copyright © Texas Education Agency, 2015. All rights reserved.

4. Calculating Single File Sizes What factors determine file size?  Image Quality – The larger the file size the better quality  Distribution Method – Broadcast, Stream, Download. Large files eat bandwidth  Archive – How much digital (disc) space is needed to archive  Bit depth and sample size (these are specific to Audio and Video files) Copyright © Texas Education Agency, 2015. All rights reserved.

5. Calculating Single File Sizes - Units of Measure – To convert pixels to inches you need to know that there are 72 pixels per inch. The formula to convert pixels to inches is X/72=inches, where X is the number of pixels on a side.  720px /72 = 10 inches  480px /72= 6.6666 inches  1920px /72 = 26. 6666 inches  1080px /72 = 15 inches Copyright © Texas Education Agency, 2015. All rights reserved.

6. Calculating Single File Sizes – Units of Measure –  Bit – the smallest unit of data in a computer  Byte = 8 bits  Kilobyte (KB) = 1024 Bytes  Megabyte (MB) = 1024 Kilobytes  Gigabyte (GB) = 1024 Megabytes Copyright © Texas Education Agency, 2015. All rights reserved.

7. Calculating Single File Sizes – Units of Measure – Conversion:  Bit / 8 = Byte  Byte / 1024 = Kilobyte (KB)  Kilobyte (KB) / 1024 = Megabyte (MB)  Megabyte (MB) / 1024 = Gigabyte (GB) Copyright © Texas Education Agency, 2015. All rights reserved.

8. Calculating Single File Sizes – Definitions – DPI – Dots Per Inch – used mostly in print. This refers to the resolution of the printed page. Sample Rate – The number of times a digital converter samples the analogue source. Example:  Audio - 44.1 kHZ,  Video – 4:2:2 (color and luminance)  Image – 3 bit RGB Copyright © Texas Education Agency, 2015. All rights reserved.

9. Calculating Single File Sizes – Definitions – – Definitions – Bit Depth – The number of bits of information per Sample.  Audio – 16 bit  Video – 8 bit uncompressed  Image – 3 bit RGB Copyright © Texas Education Agency, 2015. All rights reserved.

10. Calculating Single File Sizes – Formula – L x W x 3 (RGB Bytes) Step 1 SD – 720px x 480px x 3 = 1,036,800 bytes (of information) HD – 1920px x 1080px x 3 = 6,220,800 bytes (of information) Copyright © Texas Education Agency, 2015. All rights reserved.

11. Calculating Single File Sizes – Formula – Step 2 Convert SD: 1,036,800 / 1024 = 1,012.5 Kilobytes (KB) 1,036,800 / (1024 x 1024) =.9887695 Megabytes (MB) 1,036,800/ (1024 x 1024 x 1024) =.0009655 Gigabytes (GB) Copyright © Texas Education Agency, 2015. All rights reserved.

12. Calculating Single File Sizes – Formula – Step 2 Convert HD: 6,220,800 / 1024 = 6,075 Kilobytes (KB) 6,220,800 / (1024 x 1024) = 5.932 Megabytes (MB) 6,220,800 / (1024 x 1024 x 1024) =.00579 Gigabytes (GB) Copyright © Texas Education Agency, 2015. All rights reserved.

13. Calculating Single File Sizes Your Turn! Copyright © Texas Education Agency, 2015. All rights reserved.