Podcast Compression Techniques. Richard Harrington - RHED Pixel

Transcription

1 Podcast Compression Techniques Richard Harrington - RHED Pixel

2 Purpose Help your podcasts sound (and look) their best. Learn effective compression techniques that produce compatible files. Learn to use modern tools that shrink your files with no perceivable loss of quality. Reduce download times, save costs, and deliver high-quality shows. Software solutions for both Mac and PC users will be demonstrated.

3 Available from Focal Press

4 Available from Peachpit Press

5 Podcasts Understanding Adobe Photoshop Digital Imaging Essentials Photoshop for Video Essentials for Digital Video Final Cut Help Training for Apple s Final Cut Studio

6 Websites Photoshop for Video Video and Motion Graphics Professionals Raster Vector Graphics Professionals and Enthusiasts

7 RHED Pixel Podcasting Experience

8 Podcasting Experience Podcasts Produced - Understanding Adobe Photoshop - Final Cut Help - Photoshop for Video - Secrets of Style with Kim Foley - Author Tips for Peachpit Press - Tech On the Road - Inside the Digital Media Classroom - Photoshop CS3 Sneak Peek

9 Podcasting Experience Podcasts Produced - On Software - On Security - On Open Source - On Microsoft - On Networking - Voices That Matter - College Now

10 Compression is a Science

11 Compression is a Science Lots of technology at work Cutting edge research Digital Rights Management Expensive Setup and Hosting Fortunes to be had

12 Compression is Common Sense

13 Compression is Common Sense Making copies Get it out there Few concepts to learn Fairly automated Value added service Speed up production

14 The Language

15 Architecture Global family or classification of a file Includes MPEG, QuickTime, Windows Media, AIFF The big picture.

16 Batch Processing A benefit of many compression utilities Set up several files to run Walk away and leave your computer working hard Key to making money

17 Bit Rate How much data per second there is in your file The higher the number, the larger the file Larger usually means more quality, but codec dependant

18 Channels Common will be the choice between stereo and mono Stereo files use two channels of audio data Mono use half the space Talking heads use mono

19 Compress Shrinking the file using mathematical algorithims Modern compression techniques are significantly more effective

20 Compressor/Decompressor The algorithm that allows for further shrinking of the files Some compressors cost additional money to the content creator Decompressors are usually free to improve market share

21 Encode To turn an analog source (such as audio waves) into a digital file This is also called capturing (or diging) by some.

22 Pixel Aspect Ratio Computer pixels are square Digital video pixels can be rectangular or nonsquare The video editing software or playback device compensates For computer playback you will need to manually resize Standard in Square Pixels 640 X 480 (720*.9) Widescreen in Square Pixels 864X480 (720*1.2)

23 Resolution Also called sample size Number of bits used to describe the analog data Audio CDs are usually 16-bit Newer DVD audio discs are frequently 24-bit Bigger is higher quality

24 Sampling Rate The number of samples captured per second Audio CDs are 44.1 khz Digital Video is 48 khz Bigger is higher quality

25 Variable Bit Rate (VBR) Compression One of the most effective ways to create smaller files Computer analyzes the file before compressing the data Encoding this way is far slower If you can, choose this method for superior results

26 Podcast Compression

27 Audio Podcast Compression Two choices for file types for ipod compatiblity.m4a.mp3

28 Video Podcast Compression Two choices for file types for ipod compatiblity MPEG-4 H.264 Other formats used include Flash Video Windows Media NOT true podcasting

29 MPEG-4 Specs Frame size 640 X 480 or 320 X Up to 2.5 Mbps - 30 frames per second - Simple Profile - Audio up to 160 kbps, 48 Khz, stereo

30 H.264 Specs Large Size x Up to 1.5 Mbps - 30 frames per second - Audio up to 160 kbps, 48 Khz, stereo Small Size 320 x Up to 768 kbps - 30 frames per second - Audio up to 160 kbps, 48 Khz, stereo

31 Apple TV Specs Apple TV can display H.264 video, up to 5mbps, 1280x720, 24 fps, Progressive Main Profile. Apple TV supports AAC-LC audio up to 320 Kbps. Input Output 640x480, 30fps 640x480, 30fps, 3mbps* 1280x720 24fps 1280x720, 24p 5mbps* 1280x720, 30fps 960x540, 30fps 4mbps* 1920x1080, 24fps 1280x720, 24fps 5mbps* 1920x1080, 30fps 960x540, 30fps 4mbps* 1080i up to 60fps 960x540, 30fps 4mbps*

32 Compression Advice Is there a need for multiple sizes? Balance data rate carefully Examine frame rate Audio quality can be reduced Always test on intended player - ipod 5G - Sony PSP - Zune - Desktop & Laptop - Mac and Windows

33 Mac Compression Tools QuickTime Pro Sorenson Squeeze Compressor Episode & Episode Pro discreet Cleaner Stomp Adobe Media Encoder

34 PC Compression Tools QuickTime Pro Sorenson Squeeze Procoder discreet Cleaner Adobe Media Encoder Flip Factory

35 More on Compression podcaststechspecs.html

36 5 Steps to Better Audio Compression

37 5 Steps to Better Audio Compression 1. Lower your sample rate 2. Choose the right use of channels 3. Choose the right codec 4. Don t use a conduit 5. Test it

38 10 Steps to Better Video Compression

39 10 Steps to Better Video Compression 1. De-interlace your video 2. Lower your audio standards 3. Shrink the window 4. Reshape the video 5. Restore the washed-out picture

40 10 Steps to Better Video Compression 6. Improve the Saturation 7. Frame Rate 8. Codecs 9. Don t use a Conduit 10. Test it

41 Essential Processes

42 Pre-Processing All Can Pre-Process May Use Different Names Different Interfaces Preview Filters

43 Video Image Issues Crop Image Size De-interlace Sharpen Adaptive Noise Reduction

44 Video Image Issues

45 Image Adjust Issues

46 Displayed Frames

47 Displayed Frames Set In-Point Set Out-Point Add Video Fades Add Audio Fades

48 General Advice Adjust Saturation Roll to the Red Restore Blacks Crop Blanking Check In and Out Points Use Fades

49 Tools to Try Out

50 Mac Compression Tools QuickTime Pro itunes Sorenson Squeeze Compressor Episode & Episode Pro discreet Cleaner

51 PC Compression Tools QuickTime Pro itunes Sorenson Squeeze Procoder discreet Cleaner FlipFactory

52 Selecting the Right Tool Budget Output Formats Speed Frequency of Updates Tech Support Batch Options

53 More on Compression podcaststechspecs.html

54 Show & Tell

55 Questions & Answers

56 Resources

57 Resources

58 Available from Focal Press

59 Available from Peachpit Press

60 Available from VASST

61 Podcasts Understanding Adobe Photoshop Digital Imaging Essentials Photoshop for Video Essentials for Digital Video Final Cut Help Training for Apple s Final Cut Studio

62 Websites Photoshop for Video Video and Motion Graphics Professionals Raster Vector Graphics Professionals and Enthusiasts

63 Podcast Compression Techniques Richard Harrington - RHED Pixel

64 Podcast Compression Techniques Richard Harrington - RHED Pixel

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