Chapter 8: Encoding
198
MPEG-1 and MPEG-2 Audio Codecs
MPEG Layer 1
The oldest and most widely supported MPEG CD-ROM audio standard. This audio codec is
obsolete, and generally inferior to MPEG Layer 2. Available only for MPEG video.
MPEG Layer 2
The MPEG audio codec for CD-ROM and DVD audio. It produces excellent audio quality. The
high data rates it requires make it less suitable for network applications. Available only for
MPEG video.
Uncompressed PCM
A format most often used for audio editing. Available only for MPEG video.
QuickTime Audio Codecs
Mace 3:1
A general purpose audio codec for music.
Mace 6:1
A general purpose audio codec for speech.
QDesign Music 2
A high quality, low data rate audio compressor.
Qualcomm PureVoice
The Qualcomm PureVoice audio codec is optimized for speech. It has two options:
Full Rate
— Produces larger, higher-quality files and delivers approximately 9:1 compression.
Half Rate
— Produces smaller files with its approximately 19:1 compression, but the quality is
correspondingly lower.
If you are producing audio files that are intended to be delivered via a streaming server, we also
recommend that you check the Optimize compression for streaming option. This option
removes all the zeros off the end of each audio packet, reducing the data rate for both Full Rate
and Half Rate options. The amount of reduction varies significantly with the complexity of the
audio.
Note:
You must use a sample rate of 8 kHz for good results when doing realtime streaming with
a QuickTime Streaming Server. Any rate can be used for progressive-streaming files.
Summary of Contents for 64006-051108-9001 - Discreet Cleaner - Mac
Page 1: ...from discreet November 2000 ...
Page 8: ...Contents viii ...
Page 16: ...Chapter 1 Introduction 8 ...
Page 24: ...Chapter 2 Capture 16 ...
Page 54: ...Chapter 4 Projects 46 ...
Page 68: ...Chapter 5 Settings 60 ...
Page 148: ...Chapter 7 Formats 140 ...
Page 160: ...Chapter 8 Encoding 152 ...
Page 220: ...Chapter 8 Encoding 212 ...
Page 248: ...Chapter 11 Workflow 240 ...
Page 254: ...Chapter 12 Troubleshooting 246 ...
Page 284: ...Glossary 276 ...