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QTCompressionOptions Reference

Overview

This class represents a set of compression options for a particular type of media. QTCompressionOptions objects are used to describe compression options for different kinds of media. Compression options are created from presets keyed by a named identifier. Preset identifiers are described in the Constants section that describes the Compression Options Identifiers.

Tasks

Creating and Configuring Compression Options

• + compressionOptionsIdentifiersForMediaType:
• + compressionOptionsWithIdentifier:

Receiving Compression Options

• – mediaType
• – localizedDisplayName
• – localizedCompressionOptionsSummary
• – isEqualToCompressionOptions:

Class Methods

compressionOptionsIdentifiersForMediaType:

An array of identifiers that can be used to create compression options on the user’s computer.

+ (QTCompressionOptions *)compressionOptionsWithIdentifier:(NSString *)identifier

Return Value

An array of strings that can be used to create compression options with compressionOptionsWithIdentifier:.

Availability

• Mac OS X v10.5 and later.

Declared In

QTCompressionOptions.h

compressionOptionsWithIdentifier:

A QTCompressionOptions instance configured with the options for the given identifier.

+ (QTCompressionOptions *)compressionOptionsWithIdentifier:(NSString *)identifier

Return Value

A compression options object with the appropriate compression options.

Availability

• Mac OS X v10.5 and later.

Declared In

QTCompressionOptions.h

Instance Methods

isEqualToCompressionOptions:

Returns whether the receiver contains options identical to those in the given compression options object.

- (BOOL)isEqualToCompressionOptions:(QTCompressionOptions *)compressionOptions

Availability

• Mac OS X v10.5 and later.

Declared In

QTCompressionOptions.h

localizedCompressionOptionsSummary

A localized summary of the receiver’s compression options.

- (NSString *)localizedCompressionOptionsSummary

Return Value

A localized string summarizing the receiver's compression options.

Availability

• Mac OS X v10.5 and later.

Declared In

QTCompressionOptions.h

localizedDisplayName

A short localized name describing the receiver’s compression options.

- (NSString *)localizedDisplayName

Return Value

A localized string appropriate for display in the user interface (in a list of compression options, for example).

Availability

• Mac OS X v10.5 and later.

Declared In

QTCompressionOptions.h

mediaType

The media type on which the receiver’s compression options should be used.

- (NSString *)mediaType

Return Value

A QuickTime media type, such as QTMediaTypeVideo or QTMediaTypeSound.

Availability

• Mac OS X v10.5 and later.

Declared In

QTCompressionOptions.h

Constants

The following are compression options identifiers. These identifiers can be passed to the compressionOptionsWithIdentifier: class method to get an instance configured with the compression options for that identifier.

QTCompressionOptionsLosslessAppleIntermediateVideo

Compresses video using the Apple Intermediate codec at lossless quality.

@"QTCompressionOptionsLosslessAppleIntermediateVideo"

Constants

@"QTCompressionOptionsLosslessAppleIntermediateVideo"

This is appropriate for an intermediate format for media that requires further processing.

Declared In

QTCompressionOptions.h

QTCompressionOptionsLosslessAnimationVideo

Compresses video using the Animation codec at highest quality and color depth.

@"QTCompressionOptionsLosslessAnimationVideo"

Constants

@"QTCompressionOptionsLosslessAnimationVideo"

This is appropriate for an intermediate format for media that requires further processing.

Declared In

QTCompressionOptions.h

QTCompressionOptions120SizeH264Video

Compresses video using the H.264 codec using medium bit-rate settings with dimensions no larger than 160x120.

@"QTCompressionOptions120SizeH264Video"

Constants

@"QTCompressionOptions120SizeH264Video"

This is appropriate for delivery to low-bandwidth and low-capacity destinations.

Declared In

QTCompressionOptions.h

QTCompressionOptions240SizeH264Video

Compresses video using the H.264 codec using medium bit-rate settings with dimensions no larger than 320x240.

@"QTCompressionOptions240SizeH264Video"

Constants

@"QTCompressionOptions240SizeH264Video"

This is appropriate for delivery to medium-bandwidth and medium-capacity destinations.

Declared In

QTCompressionOptions.h

QTCompressionOptionsSD480SizeH264Video

Compresses video using the H.264 codec using medium bit-rate settings with dimensions no larger than 720x480.

@"QTCompressionOptionsSD480SizeH264Video"

Constants

@"QTCompressionOptionsSD480SizeH264Video"

This is appropriate for delivery to medium and high-bandwidth and medium- and high-capacity destinations.

Declared In

QTCompressionOptions.h

QTCompressionOptions120SizeMPEG4Video

Compresses video using the MPEG-4 codec using medium bit-rate settings with dimensions no larger than 160x120.

@"QTCompressionOptions120SizeMPEG4Video"

Constants

@"QTCompressionOptions120SizeMPEG4Video"

This is appropriate for delivery to low-bandwidth and low-capacity destinations.

Declared In

QTCompressionOptions.h

QTCompressionOptions240SizeMPEG4Video

Compresses video using the MPEG-4 codec using medium bit-rate settings with dimensions no larger than 320x240.

@"QTCompressionOptions240SizeMPEG4Video"

Constants

@"QTCompressionOptions240SizeMPEG4Video"

This is appropriate for delivery to medium-bandwidth and medium-capacity destinations.

Declared In

QTCompressionOptions.h

QTCompressionOptionsSD480SizeMPEG4Video

Compresses video using the MPEG-4 codec using medium bit-rate settings with dimensions no larger than 720x480.

@"QTCompressionOptionsSD480SizeMPEG4Video"

Constants

@"QTCompressionOptionsSD480SizeMPEG4Video"

This is appropriate for delivery to medium and high-bandwidth and medium- and high-capacity destinations.

Declared In

QTCompressionOptions.h

QTCompressionOptionsLosslessALACAudio

Compresses audio using the Apple Lossless codec.

@"QTCompressionOptionsLosslessALACAudio"

Constants

@"QTCompressionOptionsLosslessALACAudio"

This is appropriate for an intermediate format for media that requires further processing.

Declared In

QTCompressionOptions.h

QTCompressionOptionsHighQualityAACAudio

Compresses audio using the AAC codec at 64 kbps per channel.

@"QTCompressionOptionsHighQualityAACAudio"

Constants

@"QTCompressionOptionsHighQualityAACAudio"

This is appropriate for delivery of high-quality music and other audio.

Declared In

QTCompressionOptions.h

QTCompressionOptionsVoiceQualityAACAudio

Compresses audio using the AAC codec at 32 kbps per channel.

@"QTCompressionOptionsVoiceQualityAACAudio"

Constants

@"QTCompressionOptionsVoiceQualityAACAudio"

This is appropriate for delivery of voice recordings.

Declared In

QTCompressionOptions.h

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