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Leopard Technical Q&As: Audio
Apple's cross-platform QuickTime technology supports a wide range of audio compression and file formats including AAC, MP3, AIFF, and standard MIDI. QuickTime applications can use Apple's Core Audio technology for complete control of sound synthesis, processing, and playback of high-resolution audio, scalable to future audio formats.

View all QuickTime Technical Q&As.
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Creating Core Audio Format (.caf) Files (HTML)
QA1534: Describes how to use afconvert to create .caf files
2009-01-07
How do I create a QuickTime movie from PCM audio samples in memory? (HTML)
QA1539: How to create a QuickTime movie from PCM audio samples in memory
2007-08-29
MovieAudioExtraction - Ensure a Movie is fully loaded before starting an extraction session (HTML)
QA1469: Describes the importance of making sure a Movie is fully loaded before extracting audio.
2006-03-29
MovieAudioExtraction - Extracting all available audio samples (HTML)
QA1481: Describes how to correct for MovieAudioExtraction missing some audio samples at the end of audio files.
2006-07-18
Playback of QuickTime movie audio through a multi-channel speaker system (HTML)
QA1627: Specify a specific pair of channels for QuickTime audio movie playback through a multi-channel speaker system
2008-11-05
Playing QuickTime 3 Movie Sound Data (HTML) (日本語 HTML)
QTMTB50: Explains why a movie's sound data can continue to play longer than video data.
1998-11-09
QuickTime Audio - Easy Frequency Level Metering with MovieAudio APIs (HTML)
QA1459: Describes how to perform frequency band level metering using MovieAudio metering APIs.
2009-01-29
QuickTime Audio - Retrieving the correct audio format bit depth value (HTML)
QA1477: Discusses how to retrieve accurate audio format bit depth.
2008-11-05
Sound Manager Codec support in QuickTime 7 (HTML)
QA1448: Describes QuickTime 7 support for constant bitrate and variable bitrate Sound Manager codecs
2005-10-26
Standard Audio - Parsing the kQTSCAudioPropertyID_CodecSpecificSettingsArray property (HTML)
QA1437: Discusses how to parse the kQTSCAudioPropertyID_CodecSpecificSettingsArray property returned from StdAudio. Also see Q&A 1390.
2006-11-30
Standard Audio - Setting output ASBD returns badFormatErr (HTML)
QA1489: Discusses why badFormatErr may be returned from Standard Audio
2006-11-15
Standard Audio - The CodecSpecificSettingsArray and MagicCookie properties (HTML)
QA1390: Discusses Core Audio AudioConverter configuration with StdAudio, specifically the CodecSpecificSettingsArray property.
2006-11-16