Monkeybread Software - MBS FileMaker Plugin: Functions not supported on FileMaker Server
changethru.infoishedFileName. Queries the file name for the finished script to call. Mac/ Queries authorization status for audio/video recording. Mac/ .. Adds an relation to a contact. Mac/ Sets the script called when a download failed. These constants are returned by the AVPlayer status property to indicate If the receiver's status is AVPlayerStatusFailed, this describes the error that caused the failure. . @abstract Simultaneously sets the playback rate and the relationship. with error type InvalidStateError, if it is called in an invalid state. .. MPEG-DASH: -8x ~ 8x (Trick play (forward on fast network connection (HbbTV), . Examples of exception scenarios include an invalid DRM session, or failure to create the.
The most commonly used track types are audio and video tracks, but AVAssetTrack also models other supplementary tracks such as closed captions, subtitles, and timed metadata see Figure In these cases, AVAsset also provides methods to retrieve subsets of tracks based on criteria such as identifier, media type, or characteristic.
In many cases this is a suitable way of creating an asset, but you can also directly instantiate an AVURLAsset when you need more fine-grained control over its initialization.
You could do this as shown in the following example: Preparing Assets for Use You use the properties of AVAsset to determine its features and capabilities, such as its suitability for playback, duration, creation date, and metadata.
Video Composition With iOS - Viggiosoft Blog
Creating an asset does not automatically load its properties or prepare it for any particular use. In macOS, this can result in an unresponsive user interface if an unloaded property is accessed from the main thread. In iOS and tvOS, the situation can be even more serious because media operations are performed by the shared media services daemon.
If the request to retrieve an unloaded property value is blocked for too long, a timeout occurs resulting in a termination of media services. AVAsset and AVAssetTrack adopt the AVAsynchronousKeyValueLoading protocol, which defines the methods you use to query the current loaded state of a property and asynchronously load one or more property values, if needed.
The protocol defines two methods: The final play is a set of scenes, shot on different locations, that compose a story. Each scene consists of a prologue, a conclusion epilogue and a set of smaller clips that will be played by the app based on some user choices. If the choices are correct, then the user will be able to play the whole scene up to its happy end, but in case of mistakes the user will return to the initial prologue scene or to some intermediate scene.
The diagram below shows a possible scheme of a typical scene: What I have in my hands is the full set of tracks, each track representing a specific subsection of a scene, and a storyboard which gives me the rules to be followed in order to build the final story. So the storyboard is made of the scenes, of the tracks the compose each scene and of the rules that establish the flow through these tracks. The main challenge for the developer is to put together these clips and play a specific video based on the current state of the storyboard, then advance to the next, select a new clip again and so on: Besides the user needs to take his decisions by interacting with the app and this can be done by overlapping the movie with some custom controls.
These conrollers are good to play a movie and provide the system controls, with full-screen and device rotation support, but absolutely not for advanced controls. Since the release of iPhone 3GS the camera utility had some trimming and export capabilities, but these capabilities were not given to developers through public functions of the SDK. With the introduction of iOS 4 the activity done by Apple with the development of the iMovie app has given the developers a rich set of classes that allow full video manipulation.
All these classes have been collected and exported in a single public framework, called AV Foundation. This framework exists since iOS 2.
The position of AV Foundation in the iOS Frameworks stack is just below UIKit, behind the application layer, and immediately above the basic Core Services frameworks, in particular Core Media which is used by AF Foundation to import basic timing structures and functions needed for media management. In any case you can note the different position in the stack in comparison with the very high-level Media Player.
ios - AVPlayer status always AVPlayerStatusReadyToPlay - Stack Overflow
This means that this kind of framework cannot offer a plug-and-play class for simple video playing but you will appreciate the high-level and modern concepts that are behind this framework, for sure we are not at the same level of older frameworks such as Core Audio.
The starting point and main building block is given by AVAsset. AVAsset represents a static media object and it is essentially an aggregate of tracks which are timed representation of a part of the media.
All tracks are of uniform type, so we can have audio tracks, video tracks, subtitle tracks, and a complex asset can be made of more tracks of the same type, e.
In most cases an asset is made of an audio and a video track. There are two concrete asset classes available: To create an asset from a file we need to provide its file URL: If this movie is in QuickTime or MPEG-4 then the file contains additional summary information that cancels this extra parsing time; but the are other formats, like MP3, where this information can be extracted only after media file decoding, in such case the initialization time is not negligible.
This is a first recommendation we give to developers: In our application we already know the characteristics of the movies we are using, but in a different kind of application, where you must do some editing from user imported movies, you may be interested in inspecting the asset properties.
For completeness we simply introduce the way asset inspection can be done leaving the interested user to the reference documentation see the suggested readings list at the end of this post.Swift: YouTube - How to Play Video with Animation using AVPlayer (Ep 16)
Basically each asset property can be inspected using an asynchronous protocol called AVAsynchronousKeyValueLoading which defines two methods: In the first case the key value is known and then the value can be immediately retrieved. In case the value is unknown it is appropriate to call the loadValuesAsynchronouslyForKeys: Video composition As I said at the beginning, my storyboard is made by a set of scenes and each scene is composed by several clips whose playing order is not known a priori.
When we get a set of assets, or tracks, and from them we build a composition all in all we are creating another asset. You can add media content inside a mutable composition by simply selecting a segment of an asset, and adding it to a specific range of the new composition: So the code can be simply written in this way: Note that all media have a concept of time different than the usual.
AVFoundation Programming Guide
First of all time can move back and forth, besides the time rate can be higher or lower than 1x if you are playing the movie in slow motion or in fast forward.
Besides it is considered more convenient to represent time not as floating point or integer number but as rational numbers. For such reason Core Media framework provides the CMTime structure and a set of functions and macros that simplify the manipulation of these structures.
So in order to build a specific time instance we do:
- Media Playback Programming Guide
- Video Composition With iOS