QTKIT FREE DOWNLOAD

Performs any QTKit-specific shut-down for the background thread. You use the isRecordingPaused method to return whether recording to the file returned by outputFileURL has been previously paused using the pauseRecording method. Also included is a button for sharing the media via email, text message, YouTube and others. The following code snippet Listing demonstrates how to set up a QTMovie object on the main thread and how to do an export on a background thread. Get the most recent frame. Note that once you call initWithAttributes: Declare three instance variables that point to a QTMovie object, one of which point to Interface Builder outlets.

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Used to specify the location of a movie or its media data. Of the classes in this group, one of the most useful is QTCompressionOptionswhich lets you describe compression options for all kinds of different media, using the compressionOptionsIdentifiersForMediaType: The QTMovie class includes an extensive number of instance and class methods that qrkit you perform a wide range of operations on QuickTime movies.

There is only one class in this particular group, which is devoted to accessing a device, as shown in Table See the Sample Code 'avmetadataeditor' for an example of working with media metadata in AV Foundation.

The QTKit framework is comprised of 23 Objective-C, Cocoa classes, along with over methods, attributes, constants, and notifications. QTTrack objects are associated with QTMovie objects and support methods for getting and setting the track properties.

QTKit Architecture

The value of this method is key value observable using the key "recordingPaused". The only time you will ever get back nil is if there is a problem with your parameters or with locating the data. This connection provides the QTMovieView object with a reference to the QuickTime movie that is to be opened and displayed.

When layer backing is enabled for a view, the view and all its subviews are, in effect, mirrored by a Core Animation layer tree. Each track is comprised of an array of track segments, represented by instances of AVCompositionTrackSegment. You use these methods to specify the minimum amount of time that should separate consecutive frames output by the receiver, which is the inverse of the maximum frame rate.

QTKit Application Programming Guide

Used to display and control QuickTime movies in combination with a QTMovie object, which supplies the movie being displayed. Notably, this sample takes advantage of the advanced Core Animation layer visual properties and applies a Core Image filter to the contents of the QTMovieView to achieve a cool visual effect.

A QTMovie object can be initialized from a file, from a resource specified by a URL, from a block of memory, from a qfkit, or from an existing QuickTime movie. Finally, you add this line of code to your setVideoPreviewFilter method block in your implementation file:. qtkjt

But how do you know the movie is ready to play, particularly if it is a very large file? These are the defined movie load states:. In the Inspector panel, select the Movie View Attributes icon, which appears as the first icon in the row at the top of the panel.

The QTCaptureSession class provides an interface for connecting input sources to output destinations.

Using these classes and methods, you can record professional-quality audio and video content from one or more cameras and microphones, including USB and Firewire devices, as well as DV media devices.

Using these objects you can, for example, choose which of the tracks you want to be represented in the output file, specify your own output format, or modify the asset during the conversion process. This chapter defines the conceptual outlines of the QTKit capture architecture, its class hierarchy and underlying object behavior. This method creates a new storage container at the location specified by the data reference and returns a QTMovie object that has that container as its default data reference.

To create thumbnail images of video independently of playback using AV Foundation, you initialize an instance of AVAssetImageGenerator using the asset from which you want to generate thumbnails. As a subclass of NSViewQTMovieView supports movie playback and editing, with a movie controller bar that is displayed in the view, but can be optionally hidden.

In a typical simple case, one track represents the audio component and another represents the video component; in a complex composition, there may be multiple overlapping tracks of audio and video.

You follow these steps, preferably in the order defined below, to construct the application, using Xcode and Interface Builder tools:.

This document describes the mapping of the QTKit classes and methods to the newer AV Foundation classes to help you get started working with AV Foundation objects and their associated methods to accomplish a variety of tasks.

These are discussed in this chapter. These are fundamental to understanding the methodology and high-level workings of the API.

QTKit | Apple Developer Documentation

To better understand these frameworks, you can view their implementation depicted graphically as a set of layers, shown in Figure Capture inputs, which are subclasses of Qtoitprovide the necessary interfaces to different sources of captured media.

A great deal of functionality is packed into a relatively small objective API.

There are two classes in this particular group, one devoted to qtikt video, another providing support for Core Animation layers. These are attributes that specify where the movie data is located.