AVAssetWriterInputMBS.expectsMediaDataInRealTime as boolean

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	13.2	✅ Yes	❌ No	❌ No	✅ Yes	All

Indicates whether the input should tailor its processing of media data for real-time sources.

If you are appending media data to an input from a real-time source, such as an AVCaptureOutput, you should set expectsMediaDataInRealTime to true. This will ensure that readyForMoreMediaData is calculated appropriately for real-time usage.
(Read and Write property)

Some examples using this property:

• /AVFoundation/Make Video From Images
• /AVFoundation/Make Video From Images with transparency
• /AVFoundation/Transcode
• /AVFoundation/Transcode batch
• /AVFoundation/Transcode parallel

AVAssetWriterInputMBS.extendedLanguageTag as String

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	14.0	✅ Yes	❌ No	❌ No	✅ Yes	All

Language tag to associate with the track corresponding to the receiver.

The value is specified as an RFC 4646 language tag; can be nil in which case no tag is written to the track.

Extended language tags are normally set only when an ISO 639-2/T language code by itself is ambiguous, as in cases in which media data should be distinguished not only by language but also by the regional dialect in use or the writing system employed.
Available in OS X v10.9 and later.
(Read and Write property)

AVAssetWriterInputMBS.Handle as Integer

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	13.2	✅ Yes	❌ No	❌ No	✅ Yes	All

The internal object reference.

(Read and Write property)

AVAssetWriterInputMBS.isReadyForMoreMediaData as boolean

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	13.2	✅ Yes	❌ No	❌ No	✅ Yes	All

Indicates the readiness of the input to accept more media data. (read-only)

This property is observable using key-value observing (see Key-Value Observing Programming Guide). Observers should not assume that they will be notified of changes on a specific thread.
(Read only property)

AVAssetWriterInputMBS.languageCode as String

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	14.0	✅ Yes	❌ No	❌ No	✅ Yes	All

Language to associate with the track corresponding to the receiver.

The value is specified as an ISO 639-2/T language code; can be nil in which case no language code is written to the track..
Available in OS X v10.9 and later.
(Read and Write property)

AVAssetWriterInputMBS.marksOutputTrackAsEnabled as Boolean

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	14.0	✅ Yes	❌ No	❌ No	✅ Yes	All

Returns whether the receiver's track is enabled.

For file types that support enabled and disabled tracks, such as QuickTime Movie files, specifies whether the track corresponding to the receiver should be enabled by default for playback and processing.

The default value is true.
Available in OS X v10.9 and later.
(Read and Write property)

AVAssetWriterInputMBS.mediaTimeScale as Integer

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	13.2	✅ Yes	❌ No	❌ No	✅ Yes	All

Specifies the media time scale to be used.

For file types that support media time scales, such as QuickTime Movie files, specifies the media time scale to be used.
The default value is 0, which indicates that you should choose a convenient value, if applicable.
You cannot set this property after writing has started.
(Read and Write property)

AVAssetWriterInputMBS.mediaType as string

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	13.2	✅ Yes	❌ No	❌ No	✅ Yes	All

The media type of the samples that can be appended to the input. (read-only)

The value of this property is one of the media type strings defined in AVMediaFormat.
(Read only property)

AVAssetWriterInputMBS.naturalSize as CGSizeMBS

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	14.0	✅ Yes	❌ No	❌ No	✅ Yes	All

Size specified in the output file as the natural dimensions of the visual media data for display.

If the default value, (0,0), is specified, the naturalSize of the track corresponding to the receiver is set according to dimensions indicated by the format descriptions that are ultimately written to the output track.

Note: This property cannot be set after writing on the receiver's AVAssetWriter has started.
Available in OS X v10.9 and later.
(Read only property)

AVAssetWriterInputMBS.preferredVolume as Double

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
property	AVFoundation	MBS AVFoundation Plugin	14.0	✅ Yes	❌ No	❌ No	✅ Yes	All

Preferred volume level to be stored in the output file.

The value for this property should typically be in the range of 0.0 to 1.0.
The default value is 1.0, which is equivalent to a "normal" volume level.

Note: This property cannot be set after writing on the receiver's AVAssetWriter has started.
Available in OS X v10.9 and later.
(Read and Write property)