KR20120029299A - Method for media presentation description of a plurality of content component in http streaming service - Google Patents

Abstract

PURPOSE: A recommendation method about content elements in an HTTP(Hypertext Transfer Protocol) streaming service is provided to continuously reproduce a video by selecting the fragment of representation having high bandwidth. CONSTITUTION: An MPD(Media Presentation Description) from which an MPD analyzer is received is analyzed. The MPD analyzer selects a group according to a network condition, device capability, and user preference. The MPD analyzer confirms composition which consists of service representation and group. The composition supplies information about a network condition, device capability, and user preference.

Description

METHOOD FOR MEDIA PRESENTATION DESCRIPTION OF A PLURALITY OF CONTENT COMPONENT IN HTTP STREAMING SERVICE}

The present invention relates to an adaptive streaming technology based on 3GPP AHS (3rd Generation Partnership Project Adaptive HTTP Streaming).

3GPP AHS divides the representation of the same content and content component under different conditions (network bandwidth, resolution, codec, etc.), and divides the total length into several equal periods, and then divides the period into short enough periods (e.g. It is divided into segments (about 10 seconds) (segmentation), and consists of MPD (Multimedia Presentation Description) which specifies the file name, sequence number, start time, and length of each segment.

The segment consists of an initialisation segment with information for the decoder configuration and media segments containing segmented content components so as to properly decode the representation.

The client first receives the MPD, checks which representation is installed, determines the performance, capability, and network speed of the client device, selects an appropriate representation, downloads fragments in order, and starts playback.

If the changeable variables such as network bandwidth change, that is, when the network speed increases, the fragments of the representation written in higher bandwidth are selected and played back. As a result, the image quality varies depending on the speed of the network, but the playback does not stop. You can get it.

An object of the present invention is to provide a configurable combination recommendation method for a plurality of content elements in an HTTP streaming service.

The present invention provides a method for providing a media presentation description in an HTTP streaming service, and provides a method for providing information of a media presentation (content) that can be provided using a plurality of content components described in one MPD.

According to the present invention, by selecting and reproducing a fragment of a representation created with a high bandwidth, the image quality may vary depending on the speed of the network, but the reproduction may be effected without interruption.

1 illustrates a procedure for providing a media presentation description in an HTTP streaming service according to an embodiment of the present invention.
2 illustrates a procedure for providing a media presentation description in an HTTP streaming service according to an embodiment of the present invention.
3 illustrates a procedure for providing a media presentation description in an HTTP streaming service according to an embodiment of the present invention.

All of the contents described in the present invention may be referred to each other among the embodiments, and combinations of the embodiments may be possible.

[Term definition]

AHS: Adaptive Http Streaming

* DASH: Dynamic Adaptive Streaming over HTTP

* Content: creations such as movies, music and news and their storage forms

Content component: the components that make up the content (e.g. video, audio, subtitles, metadata, auxiliary information stream, etc.)

Representation: One (1) representation. Low and high quality representations can exist but the context is the same

The present invention describes a method of providing a media presentation description in an HTTP streaming service, and provides a method of providing information of a media presentation (content) that can be provided using a plurality of content components described in one MPD.

 Since the media presentation that can be provided is composed of a plurality of content components, this is called composition (composition or combination of content) and can provide a list of compositions.

 composition is; Each composition can be identified through attributes such as id.

Includes information referring to the representation and group to be composed of the representation and group describing the content components in the MPD.

Various information describing the representation and the group referenced in the composition may be further provided. For example, it can be information about network conditions, user preferences, and device capabilities. The additional information described in the group referred to in the compostion is information that is commonly applied to all representations belonging to the group. It is also possible to provide additional information by specifying only a specific representation.

The network condition may be information such as bandwidth, fluctuation, delay, etc., and may include various factors of network conditions commonly used in the scope of the present invention.

The user preferences may include various factors of user preferences commonly used in the scope of the present invention, including rating, language, DRM.

Device capability may also include various factors of device capability commonly used in the scope of the present invention, such as screen, display resolution, width, height, diagonal, memory, processing speed, input / output devices and methods, and DRM.

-<groupInfoRef = 1, a1, a2, a3 />

<group id = 1, a1, a2, a3 /> (a1, a2, a3 may be configured with the additional information described above)

In this case, the composition may be composed of content components configurable from a plurality of MPDs that can be provided by the service provider, and in the case of composition from content components configurable from a plurality of MPDs, the MPD includes content components constituting a composition. The time lines can be set to be the same. If the time line is common, switching between each MPD may be possible.

Various compositions possible from multiple content components described in one MPD may be described.

The composition may be described inside the MPD or may be described as a separate file outside the MPD.

In one embodiment, when described as a separate file, the composition may serve as an entry point.

When described as a separate file, the composition may be managed and interpreted as a separate file, or may be described by linking, pointing, or refering within the MPD.

xpath, xclude, etc. can be used in various techniques, such as by linking, pointing, or referencing.

If the composition is managed and interpreted as a separate file, the composition may be used in common for all periods.

When the composition information is modified or updated, the change of the composition file may be noticed using information such as a version.

When a composition is described inside an MPD, the MPD may be described to apply to all of the Periods existing in the MPD above several Periods, or may describe compositions of each Period.

When you do composition switching, you don't have to reread a separate file.

With the composition id, if the MPD is updated or the period is changed, I can find the composition I was running and continue to receive the service.

When the period is changed, application / selection of the composition can be performed through the following procedure.

1. MPD reception

2. MPD parser parses MPD

3. The MPD parser (which is a client device) selects a service / configurable representation and group based on network conditions, device capabilities, user preferences, etc. Unselected representations may be eliminated.

4. The MPD parser identifies compositions that consist only of serviceable representations and groups.

5. Compositions can provide additional information about network conditions, device capabilities, and user preferences, and users can select the composition they want to consume based on that information.

6. Actual data of content components consumed based on the representation and group information constituting the selected compostion is requested and received.

7. When the available time of the period elapses,

8. Receive the MPD of the new period.

9. If there is no change in the client device and the user's network condition, device capability, and user preference, find the same composition as the id of the previous period and continue service. In this case, when the composition can be updated, it may be assumed that information such as version is the same.

When using the composition id to provide the same composition between periods, it is possible to reduce the selection complexity of the terminal by re-running all selection procedures from the beginning whenever the period changes.

Performing a selection using a composition is available in two ways: top-to-bottom and bottom-to-top.

1. Check the composition information first, select a composition that can be serviced by itself,

2. Check the representation and group that compose the composition

3. Request the actual data of the content components you want to consume.

In the case of the top to bottom method, each MPD may be configured for each composition, possible compositions of one MPD may be described, and various compositions may be described from several MPDs.

for bottom to top,

1. Identify the content component that can be serviced from the representation and group in the MPD,

2. From the compositions consisting only of serviceable content components, choose the composition you want to consume,

3. Request the actual data of the content components of the composition.

Claims (1)

In the method for providing a media presentation description (MPD) in the HTTP streaming service,
A method for providing information of a media presentation that can be provided using a plurality of content elements described in one MPD.

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