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- Using 3D Objects in Motion – Ripple Training

 

Paint with pressure-sensitive vector-based brushstrokes Select from over customizable brush styles from traditional to abstract Modify brush width, color, opacity, and jitter over the stroke path Automatically draw on and draw off with full customization Edit brushstrokes as bezier or advanced B-spline paths Rotate the stroke in 3D space with Face-Camera control for volumetric 3D strokes Assign pressure and speed to brush properties when using a pen and tablet Enable dynamics on paint dabs for particle paint-type effects Apply replicator-like sequencing animations that can cause the paint stroke to ripple through 3D space.

Replicator Tool. Title Design. Tracking and Stabilization. Accelerated Filters and Effects. Masking Tools. Bezier or advanced B-spline masking tools Create ovals, rectangles, and arbitrary freehand shapes Control opacity, rounding, and edge feathering Combine masks using mathematical operations Track entire shapes or control points using tracking behaviors Create image masks from alpha, luminance, or RGB values of a second image.

Some features require Internet access; fees may apply. Industry-Standard Encoding Support. Import and export captions in CEA, iTT, and SRT formats for compatibility with a wide range of workflows and websites Import caption files into a batch or iTunes Store package View closed captions in the viewer during playback Make changes to captions including text, color, onscreen location, and timing Search text and select single or multiple captions in the inspector Support for multiple languages in the same batch or iTunes Store package Validation indicator instantly warns about common errors including caption overlaps, incorrect characters, invalid formatting, and more Embed captions in the movie file or create a closed-caption sidecar file Embed audio descriptions in MOV, MP4, M4V, and MXF video files.

Create an iTunes Store package for iTunes Store submission Add your movie, trailer, closed captions, subtitles, and audio descriptions to your iTunes Store package Media pass-through lets you use original media and bypass additional compression Audition video with any audio, caption, or subtitle to verify sync iTunes Store package preview lets you audition alternative audio, closed captions, or subtitles to verify sync and seamlessly switch between audio streams during playback Built-in error detection helps you identify issues with your iTunes Store package Use the validation interface to select an error or warning and navigate directly to the source of the issue.

Import and export Mocha data from other hosts, easily set up offset tracking, and limit effects with complex masking driven by the award-winning art of planar tracking. New for New in Every editor knows the importance of transitions to drive stories forward. Continuum Transport viewers to another scene with Crash Zoom, use light leaks to elegantly move between scenes, and up your essential dissolve arsenal with both Film Glow and Prism Dissolve.

Work faster with new FX Editor presets and even blend essential dip to color or blur effects to the mix. The next evolution of Particle Illusion brings 3D models to the user-friendly generator. Import Maxon Cinema 4D files and map particles to different surface setups for full creative particle control.

After Effects users also have the ability to use text or masked shapes for line simulations. In fact, I can do many thing in Motion that require expencive plug-ins to acheive in After Effects.

Not to mention Motion is much faster to use and provides far better real time playback. To the Motion team, Keep up the great work! It's a useful and well-thought-out piece of software, and the price won't kill you.

If it wasn't made by Apple, it could be perfect. But Apple doesn't bother to perfect anything. Instead, they just make software to sell hardware. As such, each iteration of Motion is buggy as hell, and requires constant updating to new versions, which require new OSes. It breaks down like this: Every few updates requires updating to a new OS. Captioned videos can be exported for YouTube and Vimeo. And you can send your project to Compressor to include captions in a batch or an iTunes Store package.

Download free trial. The extensive third-party ecosystem for Final Cut Pro delivers best-in-class media asset management, review and approval, effects, graphic templates, and much more — right at your fingertips while you edit. Extend your workflow with powerful third-party applications right inside Final Cut Pro. Browse and select stock photos, video, and music for your edit with services like Shutterstock and APM Music, or use Frame.

You can even browse and preview hundreds of text styles at once with Font Audition, all without leaving your edit. Create amazing visuals with simple drag-and-drop effects. Use ProAnimation from Pixel Film Studios to easily create kinetic logos without keyframing, or browse a rich ecosystem of plug-ins with the FxFactory app. Add professionally designed, customizable motion graphics to your project without the need for additional software. Adjust colors, fonts, and animation styles right in the timeline, and see the changes instantly.

Take your creativity even further by making your own custom graphics using Motion. Unleash your creative potential with the Pro Apps Bundle for qualifying college students, teachers, and education institutions. Get all five professional applications for video and music creation at a special price — including Final Cut Pro, Motion, and Compressor, along with Logic Pro and MainStage. Buy now. Final Cut Pro. Free Trial Free Trial. Buy Final Cut Pro. Storytelling at its most powerful. Try Final Cut Pro for free.

Object Tracker and Cinematic mode. Unrivalled pro performance. Editing, audio, motion graphics, color grading, and delivery. The best plug-ins, effects, and tools from leading developers. Creativity that moves.

The ultimate cinematic effect. Optimized for Apple silicon Final Cut Pro features breathtaking performance and efficiency on Mac computers with Apple silicon. Up to 18 streams of 8K ProRes 2. Up to 56 streams of 4K ProRes 2. Up to 5.

 

Using 3D Objects in Motion – Ripple Training.

 

Captioned videos can be exported for YouTube and Vimeo. And you can send your project to Compressor to include captions in a batch or an iTunes Store package. Download free trial. The extensive third-party ecosystem for Final Cut Pro delivers best-in-class media asset management, review and approval, effects, graphic templates, and much more — right at your fingertips while you edit.

Extend your workflow with powerful third-party applications right inside Final Cut Pro. Browse and select stock photos, video, and music for your edit with services like Shutterstock and APM Music, or use Frame. You can even browse and preview hundreds of text styles at once with Font Audition, all without leaving your edit.

Create amazing visuals with simple drag-and-drop effects. Use ProAnimation from Pixel Film Studios to easily create kinetic logos without keyframing, or browse a rich ecosystem of plug-ins with the FxFactory app.

Add professionally designed, customizable motion graphics to your project without the need for additional software.

Adjust colors, fonts, and animation styles right in the timeline, and see the changes instantly. Take your creativity even further by making your own custom graphics using Motion.

Unleash your creative potential with the Pro Apps Bundle for qualifying college students, teachers, and education institutions. Get all five professional applications for video and music creation at a special price — including Final Cut Pro, Motion, and Compressor, along with Logic Pro and MainStage.

Buy now. Final Cut Pro. Free Trial Free Trial. Buy Final Cut Pro. Storytelling at its most powerful. Try Final Cut Pro for free. Object Tracker and Cinematic mode. Unrivalled pro performance. Editing, audio, motion graphics, color grading, and delivery. The best plug-ins, effects, and tools from leading developers.

Creativity that moves. The ultimate cinematic effect. Optimized for Apple silicon Final Cut Pro features breathtaking performance and efficiency on Mac computers with Apple silicon. Up to 18 streams of 8K ProRes 2. Up to 56 streams of 4K ProRes 2. Up to 5. Continuum has a robust set of effects and graphic templates for every project imaginable. Beat Reactor is built natively into several Continuum effects allowing specific properties to auto animate to music. Never has production value come with so few clicks.

Unleash the power of every Continuum effect by launching Mocha. Perform complicated masking tasks and track position data with incredible ease and precision. Considering upgrading from an older version of Continuum? With each release, Boris FX improves Continuum by increasing the number of filters and effects, making it faster, and making its tools even more useful. Continuum version 15 - Release date: November Continuum version Best Value!

Low Monthly Cost! Free Trial Free Trial. Buy Final Cut Pro. Blu-ray recorder required for burning Blu-ray discs. Edit and share Rec. Editing and Timeline. Press a modifier key to keep connected clips stationary while slipping, sliding, or moving clips in the Primary Storyline. Compound Clips allow complex compositions to be simplified into a single clip.

Compound Clips are automatically saved to the browser for easy reuse, and changes to Compound Clips actively update in all projects where they have been used. Auditions combine multiple clips into a single clip to see alternative takes, color grades, or effects in context Duplicate a clip inside an Audition for comparison of different effects on the same clip Edit while importing media in the background from multiple sources View material in Filmstrip or List view with a mini-filmstrip and metadata columns Skimming functionality enables fast viewing of large amounts of material Create projects with custom frame sizes Mix frame sizes, frame rates, and formats in the same timeline — with support for 8K resolution and beyond Automatically transform projects for square or vertical delivery with Smart Conform Edit at Vertical placement of scopes below viewers optimizes onscreen space.

Record Audio tool for adding narration includes a countdown and the option to record multiple takes into Auditions Six Clip Appearance presets for timeline display Multi-Touch gesture support Organize, view, mute, and export based on automatically assigned or custom roles metadata Customize project start time Join Through Edit command removes bladed cuts in the timeline Indicator dot on playhead can be used for autoselection of effects Use multiple presets or configure window layouts into custom workspaces for tasks like organizing and color grading Batch share to quickly transcode multiple clips in the browser, with or without a camera LUT Batch share to export multiple projects to multiple formats.

The following constants represent formats of a sprite track. The value of the constant indicates how override samples in a sprite track should be interpreted. The current state of the sprite track is defined by the most recent key frame sample and the current override sample.

This is the default format. The current state of the sprite track is defined by the most recent key frame sample and all subsequent override samples up to and including the current override sample. In QuickTime 4 and later, sprites in a sprite track can specify simple button behaviors. They also provide a shortcut for a common set of actions that may result in more efficient QuickTime movies. Button behaviors can be added to a sprite. These behaviors are intended to make the common task of creating buttons in a sprite track easy—you basically just fill in a template.

Three types of behaviors are available; you may choose one or more behaviors. Each change a type of property associated with a button and are triggered by the mouse states notOverNotPressed , overNotPressed , overPressed , and notOverPressed. The three properties changed are:. To use the behaviors, you fill in the new atoms as follows, using the description key specified in QT Atom Container Description Key :.

Because QT atom container—based data structures are widely used in QuickTime, a description key is presented here. The atom ID may be a number if it is required to be a constant, or it may be a list of valid atom IDs, indicating that multiple atoms of this type are allowed. The atom index may be a 1 if only one atom of this type is allowed, or it may be a range from 1 to some constant or variable.

The data may be leaf data in which its data type is listed inside of brackets [], or it may be a nested tree of atoms. The wired action grammar shown in this section allows QT event handlers to be expressed in a QuickTime movie. The sprite, text, VR, 3D, and Flash media handlers all support the embedding of QT event handlers in their media samples. In most cases, the kActionParameter atom is a leaf atom containing data; for a few parameters, it contains child atoms. Tween media is used to store pairs of values to be interpolated between in QuickTime movies.

These interpolated values modify the playback of other media types by using track references and track input maps. For example, a tween media could generate gradually changing volume levels to cause a sound track to fade out.

It has a media type of 'twen'. Every tween operation is based on a collection of one or more values from which a range of output values can be algorithmically derived.

Each tween is assigned a time duration, and an output value can be generated for any time value within the duration. In the simplest kind of tween operation, a pair of values is provided as input and values between the two values are generated as output.

A tween track is a special track in a movie that is used exclusively as a modifier track. The data it contains, known as tween data, is used to generate values that modify the playback of other tracks, usually by interpolating values. The tween media handler sends these values to other media handlers; it never presents data.

The tween sample description uses the standard sample description header, as described in Sample Table Atoms. The data format field in the sample description is always set to 'twen'. The tween media handler adds no additional fields to the sample description.

Tween sample data is stored in QT atom structures. At the root level, there are one or more tween entry atoms; these atoms have an atom type value of 'twen'. Each tween entry atom completely describes one interpolation operation. These atoms should be consecutively numbered starting at 1, using the atom ID field. Each tween entry atom contains several more atoms that describe how to perform the interpolation.

The atom ID field in each of these atoms must be set to 1. This atom specifies the time at which the interpolation is to start. If this atom is not present, the starting offset is assumed to be 0. This atom specifies how long the interpolation is to last. If this atom is not present, the duration is assumed to be the length of the sample. This atom contains the actual values for the interpolation.

The contents depend on the value of the tween type atom. Table shows all currently defined tween types. All tween types are currently supported using linear interpolation. Two rectangles and a region. The tween entry atom must contain a 'qdrg' atom with an atom ID value of 1. The region is transformed through the resulting matrices.

Two graphics modes with RGB color. Only the RGB color is interpolated. The graphics modes must be the same. Each tween type is distinguished from other types by these characteristics:.

Tween operations for each tween type are performed by a tween component that is specific to that type or, for a number of tween types that are native to QuickTime, by QuickTime itself. Movies and applications that use tweening do not need to specify the tween component to use; QuickTime identifies a tween type by its tween type identifier and automatically routes its data to the correct tween component or to QuickTime.

When a movie contains a tween track, the tween media handler invokes the necessary component or built-in QuickTime code for tween operations and delivers the results to another media handler. The receiving media handler can then use the values it receives to modify its playback. For example, the data in a tween track can be used to alter the volume of a sound track. Tweening can also be used outside of movies by applications or other software that can use the values it generates.

Numeric tween types, which have pairs of numeric values, such as long integers, as input. For these types, linear interpolation is used to generate output values. QuickDraw tween types, most of which have pairs of QuickDraw structures, such as points or rectangles, as input. For these types, one or more structure elements are interpolated, such as the h and v values for points, and each element that is interpolated is interpolated separately from others.

For these types, a specific 3D transformation is performed on the data to generate output. The polygon tween type, which takes three four-sided polygons as input. One polygon such as the bounds for a sprite or track is transformed, and the two others specify the start and end of the range of polygons into which the tween operation maps it. You can use the output a MatrixRecord data structure to map the source polygon into any intermediate polygon.

The intermediate polygon is interpolated from the start and end polygons for each particular time in the tween duration. Path tween types, which have as input a QuickTime vector data stream for a path.

Two other path tween types treat the path as a function: one returns the y value of the point on the path with a given x value, and the other returns the x value of the point on the path with a given y value. The list tween type, which has as input a QT atom container that contains leaf atoms of a specified atom type. For this tween type category, the duration of the tween operation is divided by the number of leaf atoms of the specified type.

For time points within the first time division, the data for the first leaf atom is returned; for the second time division, the data for the second leaf atom is returned; and so on. The resulting tween operation proceeds in discrete steps one step for each leaf atom , instead of the relatively continuous tweening produced by other tween type categories.

A tween QT atom container can contain the atoms described in the following sections. Specifies a tween atom, which can be either a single tween atom, a tween atom in a tween sequence, or an interpolation tween atom. The index of a kTweenEntry atom specifies when it was added to the QT atom container r ; the first added has the index 1, the second 2, and so on.

A kTweenType atom that specifies the tween type. One or more kTweenData atoms that contain the data for the tween atom.

Each kTweenData atom can contain different data to be processed by the tween component, and a tween component can process data from only one kTweenData atom a time. For example, an application can use a list tween to animate sprites. The kTweenEntry atom for the tween atom could contain three sets of animation data, one for moving the sprite from left to right, one for moving the sprite from right to left, and one for moving the sprite from top to bottom.

In this case, the kTweenEntry atom for the tween atom would contain three kTweenData atoms, one for each data set. The application specifies the desired data set by specifying the ID of the kTweenData atom to use. A kTweenStartOffset atom that specifies a time interval, beginning at the start of the tween media sample, after which the tween operation begins.

If this atom is not included, the tween operation begins at the start of the tween media sample. A kTweenDuration atom that specifies the duration of the tween operation. If this atom is not included, the duration of the tween operation is the duration of the media sample that contains it. If a kTweenEntry atom specifies a path tween, it can contain the following optional child atom:. A kTweenFlags atom containing flags that control the tween operation.

If this atom is not included, no flags are set. Note that interpolation tween tracks are tween tracks that modify other tween tracks.

The output of an interpolation tween track must be a time value, and the time values generated are used in place of the input time values of the tween track being modified. If a kTweenEntry atom specifies an interpolation tween track, it must contain the following child atoms:. If this atom specifies an interpolation tween track, it can contain either of the following optional child atoms:. A kTweenOutputMin atom that specifies the minimum output value of the interpolation tween atom.

The value of this atom is used only if there is also a kTweenOutputMax atom with the same parent. If this atom is not included and there is a kTweenOutputMax atom with the same parent, the tween component uses 0 as the minimum value when scaling output values of the interpolation tween track.

A kTweenOutputMax atom that specifies the maximum output value of the interpolation tween atom. If this atom is not included, the tween component does not scale the output values of the interpolation tween track.

For a tween atom in a tween track of a QuickTime movie, specifies a time offset from the start of the tween media sample to the start of the tween atom. The time units are the units used for the tween track. The ID of this atom is always 1. The index of this atom is always 1. This atom is optional. If it is not included, the tween operation begins at the start of the tween media sample.

Specifies the duration of a tween operation. When a QuickTime movie includes a tween track, the time units for the duration are those of the tween track. If a tween component is used outside of a movie, the application using the tween data determines how the duration value and values returned by the component are interpreted.

A kTweenEntry atom can contain only one kTweenDuration atom. If it is not included, the duration of the tween operation is the duration of the media sample that contains it. The index of a kTweenData atom specifies when it was added to the kTweenEntry atom; the first added has the index 1, the second 2, and so on. For single tween atoms, a kTweenData atom is a leaf atom. It can contain data of any type. For polygon tween atoms, a kTweenData atom is a leaf atom.

The data type of its data is Fixed[27] , which specifies three polygons. For path tweens, a kTweenData atom is a leaf atom. The data type of its data is Handle , which contains a QuickTime vector.

In interpolation tween atoms, a kTweenData atom is a leaf atom. An interpolation tween atom can be any tween atoms other than a list tween atom that returns a time value. In list tween atoms, a kTweenData atom is a parent atom that must contain the following child atoms:. A kListElementType atom that specifies the atom type of the elements of the tween atom. One or more leaf atoms of the type specified by the kListElementType atom. The data for each atom is the result of a list tween operation.

Specifies the name of a tween atom. The name, which is optional, is not used by tween components, but it can be used by applications or other software. A kTweenEntry atom can contain only one kNameAtom atom.

A kTweenEntry atom can contain only one kTweenType atom. Contains flags that control the tween operation. One flag that controls path tween atoms is defined:. If the flag is set, the tween component returns the change in value from the last time it was invoked.

If the flag is not set, or if the tween component has not previously been invoked, the tween component returns the normal result for the tween atom.

A kTweenEntry atom can contain only one kTweenFlags atom. If it is not included, no initial rotation of the tween atom is performed. This atom is a leaf atom. The data type of its data is one of the values listed in Table For each tween type, the default value is the data structure that specifies an identity transform, that is, a transform that does not alter the 3D data. Specifies the maximum output value of an interpolation tween atom.

If a kTweenOutputMax atom is included for an interpolation tween, output values for the tween atom are scaled to be within the minimum and maximum values. For example, if an interpolation tween atom has values between 0 and 4, and it has kTweenOutputMin and kTweenOutputMax atoms with values 1 and 2, respectively, a value of 0 the minimum value before scaling is scaled to 1 the minimum specified by the kTweenOutputMin atom , a value of 4 the maximum value before scaling is scaled to 2 the maximum specified by the kTweenOutputMax atom , and a value of 3 three-quarters of the way between the maximum and minimum values before scaling is scaled to 1.

If it is not included, QuickTime does not scale interpolation tween values. Specifies the minimum output value of an interpolation tween atom. If both kTweenOutputMin and kTweenOutputMax atoms are included for an interpolation tween atom, output values for the tween atom are scaled to be within the minimum and maximum values. If it is not included but a kTweenOutputMax atom is, the tween component uses 0 as the minimum value for scaling values of an interpolation tween atom. Specifies an interpolation tween atom to use for a specified kTweenData atom.

There can be any number of kTweenInterpolationID atoms for a tween atom, one for each kTweenData atom to be interpolated. The index of a kTweenInterpolationID atom specifies when it was added to the kTweenEntry atom; the first added has the index 1, the second 2, and so on.

Specifies an entry in a tween sequence. The index of a kTweenSequenceElement atom specifies its order in the sequence; the first entry in the sequence has the index 1, the second 2, and so on. The data type of its data is TweenSequenceEntryRecord , a data structure that contains the following fields:.

A value of type Fixed that specifies the point in the duration of the tween media sample at which the sequence entry ends. This is expressed as a percentage; for example, if the value is The sequence entry begins after the end of the previous sequence entry or, for the first entry in the sequence, at the beginning of the tween media sample.

This atom must be a child atom of the atom specified by the tweenAtomID field. The addition of modifier tracks in QuickTime 2. A modifier track sends data to another track; by comparison, a track reference is an association. For example, instead of playing video in a normal way, a video track could send its image data to a sprite track. The sprite track then could use that video data to replace the image of one of its sprites.

When the movie is played, the video track appears as a sprite. Modifier tracks are not a new type of track. Instead, they are a new way of using the data in existing tracks. A modifier track does not present its data, but sends it to another track that uses the data to modify how it presents its own data. Any track can be either a sender or a presenter, but not both.

Previously, all tracks were presenters. Another use of modifier tracks is to store a series of sound volume levels, which is what occurs when you work with a tween track. These sound levels can be sent to a sound track as it plays to dynamically adjust the volume. A similar use of modifier tracks is to store location and size information.

This data can be sent to a video track to cause it to move and resize as it plays. Because a modifier track can send its data to more than one track, you can easily synchronize actions between multiple tracks.

For example, a single modifier track containing matrices as its samples can make two separate video tracks follow the same path. See Creating Movies with Modifier Tracks for more information about using modifier tracks. A modifier track may cause a track to move outside of its original boundary regions. This may present problems, since applications do not expect the dimensions or location of a QuickTime movie to change over time. To ensure that a movie maintains a constant location and size, the Movie Toolbox limits the area in which a spatially modified track can be displayed.

The toolbox clips all spatially modified tracks against the region returned by GetMovieBoundsRgn. This means that a track can move outside of its initial boundary regions, but it cannot move beyond the combined initial boundary regions of all tracks in the movie. Areas uncovered by a moving track are handled by the toolbox in the same way as areas uncovered by tracks with empty edits.

As long as the track is enabled, it contributes to the boundary regions of the movie. Although QuickTime has always allowed the creation of movies that contain more than one track, it has not been able to specify relationships between those tracks. The QuickTime track-reference mechanism supports many-to-many relationships.

That is, any movie track may contain one or more track references, and any track may be related to one or more other tracks in the movie. Track references can be useful in a variety of ways. For example, track references can be used to relate timecode tracks to other movie tracks. You can use track references to identify relationships between video and sound tracks such as identifying the track that contains dialog and the track that contains background sounds. Another use of track references is to associate one or more text tracks that contain subtitles with the appropriate sound track or tracks.

Track references are also used to create chapter lists, as described in Chapter Lists. Every movie track contains a list of its track references. Each track reference identifies another related track. That related track is identified by its track identifier.

The track reference itself contains information that allows you to classify the references by type. This type information is stored in an OSType data type. You are free to specify any type value you want. Note, however, that Apple has reserved all lowercase type values. You may create as many track references as you want, and you may create more than one reference of a given type.

Each track reference of a given type is assigned an index value. The index values start at 1 for each different reference type.

The Movie Toolbox maintains these index values, so that they always start at 1 and count by 1. Using the AddTrackReference function, you can relate one track to another. The DeleteTrackReference function will remove that relationship. The SetTrackReference and GetTrackReference functions allow you to modify an existing track reference so that it identifies a different track. For a list of track reference types, see Track Reference Atoms.

A chapter list provides a set of named entry points into a movie, allowing the user to jump to a preselected point in the movie from a convenient pop-up list. The movie controller automatically recognizes a chapter list and will create a pop-up list from it. When the user makes a selection from the pop-up, the controller will jump to the appropriate point in the movie. Note that if the movie is sized so that the controller is too narrow to display the chapter names, the pop-up list will not appear.

To create a chapter list, you must create a text track with one sample for each chapter. The display time for each sample corresponds to the point in the movie that marks the beginning of that chapter. You must also create a track reference of type 'chap' from an enabled track of the movie to the text track. It is the 'chap' track reference that makes the text track into a chapter list. The track containing the reference can be of any type audio, video, MPEG, and so on , but it must be enabled for the chapter list to be recognized.

Given an enabled track myVideoTrack , for example, you can use the AddTrackReference function to create the chapter reference:. It has the value 'chap'. The text track that constitutes the chapter list does not need to be enabled, and normally is not.

If it is enabled, the text track will be displayed as part of the movie, just like any other text track, in addition to functioning as a chapter list. If more than one enabled track includes a 'chap' track reference, QuickTime uses the first chapter list that it finds.

QuickTime movies store 3D image data in a base media. This media has a media type of 'qd3d'. The 3D sample description uses the standard sample description header, as described in Sample Table Atoms. The data format field in the sample description is always set to 'qd3d'. The 3D media handler adds no additional fields to the sample description. QuickTime movies store streaming data in a streaming media track. This media has a media type of 'strm'. The streaming media sample description contains information that defines how to interpret streaming media data.

This sample description is based on the standard sample description header, as described in Sample Table Atoms. Listing Streaming media sample description. The dataFormat field can be any value you specify. The currently defined values are 'rtsp' and 'sdp '.

If 'rtsp' , the sample can be just an rtsp URL. It can also be any value that you can put in a. If 'sdp ' , then the sample is an SDP file. This would be used to receive a multicast broadcast. The QuickTime file format supports streaming of media data over a network as well as local playback. The process of sending protocol data units is time-based, just like the display of time-based data, and is therefore suitably described by a time-based format.

A QuickTime file or movie that supports streaming includes information about the data units to stream. This information is included in additional tracks of the movie called hint tracks. Hint tracks contain instructions for a streaming server which assist in the formation of packets.

These instructions may contain immediate data for the server to send for example, header information or reference segments of the media data. These instructions are encoded in the QuickTime file in the same way that editing or presentation information is encoded in a QuickTime file for local playback. Instead of editing or presentation information, information is provided which allows a server to packetize the media data in a manner suitable for streaming, using a specific network transport.

The same media data is used in a QuickTime file which contains hints, whether it is for local playback, or streaming over a number of different transport types. Separate hint tracks for different transport types may be included within the same file and the media will play over all such transport types without making any additional copies of the media itself.

In addition, existing media can be easily made streamable by the addition of appropriate hint tracks for specific transports. The media data itself need not be recast or reformatted in any way. Typically, hinting is performed by media packetizer components. QuickTime selects an appropriate media packetizer for each track and routes each packetizer's output through an Apple-provided packet builder to create a hint track.

One hint track is created for each streamable track in the movie. Hint tracks are quite small compared with audio or video tracks. A movie that contains hint tracks can be played from a local disk or streamed over HTTP, similar to any other QuickTime movie.

Hint tracks are only used when streaming a movie over a real-time media streaming protocol, such as RTP.