1. Advanced AV Production Practicum Math for The Audio Video Professional Calculating Audio and Video 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 –  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.

6. 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.

7. Calculating Single File Sizes – Definitions – 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) Copyright © Texas Education Agency, 2015. All rights reserved.

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

9. Calculating Single File Sizes – Video Formulas – Total # of Frames = Frame Rate x Duration of Video in Seconds File Size of the Frame = Horizontal Pixels x Vertical Pixels x Bit Depth / 8 x 1024 Total VIDEO File Size = Total # of Frames x File Size of the Frame Copyright © Texas Education Agency, 2015. All rights reserved.

10. Calculating Single File Sizes – Audio Formulas – Mono Audio File Size = Sample Rate x Sample Size x Time in seconds Stereo Audio File Size = (Sample Rate x Sample Size x Time in seconds) x 2

11. Calculating Single File Sizes – Total AV Formula – Video File Size + Audio File Size = Total Video File Size Copyright © Texas Education Agency, 2015. All rights reserved.

12. Calculating Single File Sizes – Example – Example video is shot in 720x1080HD, 36 seconds in duration at 24 fps and a bit depth of 8-bit Audio is Stereo 48K at 16bit Step 1 Total # of Frames = Frame Rate x Duration of Video in Seconds Example: Video has a duration of 36 seconds and shot at 24 fps 24fps x 36sec = 864 frames Copyright © Texas Education Agency, 2015. All rights reserved.

13. Calculating Single File Sizes – Example – Example video is shot in 720x1080HD, 36 seconds in duration at 24 fps and a bit depth of 8-bit Audio is Stereo 48K at 16-bit Step 2 File Size of the Frame = Horizontal Pixels x Vertical Pixels x Bit Depth / 8 x 1024 Example: Video is formatted at HD 720 x 1080 at a bit depth of 24. 1080H x 720V x 8 = 6,220,800 = 759.375 KB 8 x 1024 8192 8 x 1024 8192 Copyright © Texas Education Agency, 2015. All rights reserved.

14. Calculating Single File Sizes – Example – Example Video is shot in 720x1080 HD, 36 seconds in duration at 24 fps and a bit depth of 8-bit Audio is Stereo 48K at 16bit Step 3 Total VIDEO File Size = Total # of Frames x File Size of the Frame Example: 864 frames x 759.357 KB = 656,084.448KB or 640.707MB Copyright © Texas Education Agency, 2015. All rights reserved.

15. Calculating Single File Sizes – Example – Example Video is shot in 720x1080 HD, 36 seconds in duration at 24 fps and a bit depth of 8-bit Audio is Stereo 48K at 16bit Step 4 Total AUDIO File Size = Stereo Audio File Size = (Sample Rate x Sample Size x Time) x 2 (48,000Hz x 16 bits x 36 seconds) x 2 = 27,648,000 bits 27,648,000 = 3,456,000 bytes  3,456,000 = 3,375 KB  8 1024 8 1024 3,375 KB = 3.29 MB 1024 1024 Copyright © Texas Education Agency, 2015. All rights reserved.

16. Calculating Single File Sizes – Example – Example Video is shot in 720x1080 HD, 36 seconds in duration at 24 fps and a bit depth of 8-bit Audio is Stereo 48K at 16bit Step 5 Video File Size + Audio File Size = Total Video File Size (Video File Size – 640.707MB) + (Audio File Size – 3.29MB= (Total File Size) 643.997MB Copyright © Texas Education Agency, 2015. All rights reserved.

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