1. AUDIO AND VIDEO COMPRESSION AND IT’S IMPORTANCE ON THE INTERNET Brian Dillinger May 3, 2010

2. What is compression?  A reversible conversion of data that requires fewer bits using codecs

3. Audio and Video Codecs  A codec is a device or software that allows for COmpression and DECompression of video and audio Common Audio Codecs MP3 (MPEG-1 Audio Layer 3) FLAC (Free Lossless Audio Codec) AAC (Advanced Audio Coding) Ogg (Ogg Vorbis) Common Video Codecs DivX (MPEG-4 Part 2) XviD (MPEG-4 Part 2) H.264/x264 (MPEG Part 10) WMV (Windows Media Video)

4. Audio Standards MP3  MP3 file format is the most common  With increased quality comes increased file size  CBR vs VBR  ID3 tagging through metadata SwitchTarget Kbit/sBitrate Range Kbit/s 320 320 CBR V0245220-260 VBR V1225190-250 VBR 192 192 CBR V2190170-210 VBR

5. Audio Standards FLAC  FLAC file format is most commonly used for lossless compression  High bitrate 768 kBit/s  Large file size  Song length of 4:31 MP3 V09.12MB FLAC 32.3MB

6. Audio Compression Software  Exact Audio Copy (Powerful Accurate and FREE)  FLAC, WMV, MP3 and Ogg support  MP3 ripping capable of both VBR and CBR using Lame 3.98  Free CD lookup  iTunes  MP3 and Apple Lossless  Apple Lossless has limited playback

7. VIDEO Standards XviD  Standard Definition standard  Follows MPEG-4 part 2 standards  Lossy encoding  PAL video requires ~100GB per hour  Compressed at 200:1 XviD requires ~500MB per hour

8. Video Standards H.264/x264  Standard for High Definition video  Follows MPEG-4 part 10 standards  Allows for half the file size for the same video as XviD standards

9. Video Compression Software  bitRipper  Very simple way to convert DVD video using the XviD codec and avi container  Adobe Encore  Expensive Professional Suite  Extremely fast and efficient  Voice to text for adding subtitles

10. Why use compression?  Disc space is increasing but not infinite  Online streaming for both audio and video is a growing trend  Video conferencing and video chats

11. References  www.xvid.org www.xvid.org  www.hydrogenaudio.com www.hydrogenaudio.com  www.id3.org www.id3.org  www.flac.sourceforge.net www.flac.sourceforge.net  www.matroska.org/ www.matroska.org/