Abstract: A system and method of adding hyperlinked information to a television broadcast. The broadcast material is analyzed and one or more regions within a frame are identified. Additional information can be associated with a region, and can be transmitted in encoded form, using timing information to identify the frame with which the information is associated. The system comprising a video source and an encoder that produces a transport stream in communication with the video source, an annotation source, a data packet stream generator that produces encoded annotation data packets in communication with the annotation source and the encoder, and a multiplexer system in communication with the encoder and the data packet stream generator. The encoder provides timestamp information to the data packet stream generator and the data packet stream generator synchronizes annotation data from the annotation source with a video signal from the video source in response to the timestamp information.

Abstract: A TV transmitter, a TV transmitting—method, a TV receiver and a TV receiving method allowing users to find and choose desired programs through the use of a program guide displayed by graphical user interface (GUI). The TV transmitter comprises a signal generation unit for generating text data signals associated with TV broadcast programs and hyper text data signals corresponding to the text data signals, a multiplexer for multiplexing the text data signals and the hyper text data signals onto video signals of the TV broadcast programs to provide a multiplexed TV broadcast signal, and an output unit for outputting the multiplexed TV broadcast signal provided by the multiplexer.

Abstract: In delivering an entertainment program over a communications network, e.g., a cable TV network, interactive application data for realizing interactive features in the entertainment program are interjected into the program stream carrying the entertainment program on an as needed basis. Because the entire channel bandwidth is temporarily dedicated for transmission of the interactive application data, whose amount is relatively small compared with that of the video and audio data of the programming content, the interactive application data when transmitted appears as a short “burst,” causing a virtually unnoticeable interruption in the programming content delivery.

Abstract: Systems and methods for remotely scheduling tasks that are transmitted to a set top box and implemented on the set top box. A task service includes a website that provides program guide data to users. From the program guide data, a user selects a task. The website generates a notification that includes the task and certain identifiers, including a set top box identifier and a sequence number. The notification is sent to a notification service, that repeatedly sends the notification to a broadcast service. The broadcast service ensures that the notification is transmitted to the set top box. The set top box detects the notification from the set top box identifier and implements the task on the set top box unless the task has been previously handled.

Abstract: An interactive television broadcast system comprises a source for broadcasting a plurality of television channels and data. A plurality of remote receiving units, each include a tuner to enable the unit to be tuned to receive a selected TV channel broadcast by the source, a processor responsive to data received from the source to determine the channel to which the unit is tuned, and a transmitter for sending information relating to the channel to which the unit is tuned to a common data collector.

Abstract: A WEB server includes a control unit for HTTP server, a table of addresses of VOD servers, and a table of identifiers of video data. The control unit accesses these tables, in response to a request from a user of a terminal device for a display of video data, to retrieve therefrom an address of a video server and an identifier of a title of video data related to information on a WEB page accessed by the user, then transfers the address and the identifier to the terminal device. This enables the user of a video-on-demand system to easily obtain video data associated with information on the WEB server.

Abstract: In a one way broadcast digital video network, Internet HTML Web page data is formatted to fit within a standard MPEG-2 data packet structure, and multiplexed along with other MPEG-2 digital video signals for transport within a multiple channel digital video system. In particular, the headend server broadcasts a rotating carousel comprising an ensemble of Web pages in HTML format. The rotating carousel contains both broadcast Web pages and simulcast Web pages and a control map permitting the viewer to navigate among the HTML Web pages of the rotating carousel. In particular, the control map contains the locations of the HTML Web pages in the rotating carousel that correspond to broadcast Web pages. The control map further contains the locations of the HTML Web pages in the rotating carousel that correspond to simulcast Web pages.

Abstract: A telephone interface and voice recognition driven Internet browser system and method for accessing/browsing the Internet or other remote computing services on a cable or satellite television includes a phone for receiving a voice signal from a user. The voice signal controls a telephone interface, which displays Internet contents or other computing services on the television via a cable or satellite television channel/media. The system also includes a voice recognizer, preferably operated on a supercomputer or located in the phone, for recognizing/interpreting/analyzing a plurality of voice signals and generating command signals to access/browse the Internet or other computer services. The voice recognizer is capable of recognizing/interpreting/analyzing voice signals transmitted from a plurality of users in real time. The system further includes a stack of computers and an Internet browser.

Abstract: A system and method for providing links to services available to an operably connected local computer over a network. The present invention includes a thin portal service for finding services available to the local computer, a thin portal service web content created by the thin portal service for returning links to the discovered available services, and a web browser installed on the local computer for displaying the thin portal service content.

Abstract: A system and method are provided for streaming a media track to multiple clients using a single copy of the track's metadata, rather than making separate copies of the metadata for each stream. A media track's metadata includes information that is used to identify and locate media corresponding to different time positions in the track or media program. Sharing one copy of the metadata among multiple client streams promotes more efficient use of a media streaming server's resources. When a media track is first requested, a track object is generated to store and allow access to the metadata. For each client stream, a separate track handle object is created to manage access to the metadata for the stream's specific context. The streamed media track may be part of a live media event or may be part of a pre-recorded media program.

Abstract: A method and apparatus facilitate the retirement of interactive applications in a manner associated with an external event and a program state of the interactive application. A broadcaster transmits an interactive application that includes a plurality of retirement instructions associated with external events and internal program states of the interactive application. A broadcast receiver receives an interactive application, stores the included retirement instructions, and executes the interactive application concurrently with the display of an associated television program. The broadcast receiver monitors the broadcast signal for events indicating that the executing interactive application is no longer appropriate for the current television program.

Abstract: A method and system for providing an on-demand interactive magazine are disclosed. A method for processing a magazine generally comprises receiving a magazine and data associated with the magazine, receiving at least one broadcast, storing portions of the broadcasts, based on the data, and presenting the magazine to a user. In another embodiment, the method includes receiving broadcasts from a plurality of channels, and tuning to the channel on which a broadcast is to be received. The method also includes providing at least one hyperlink for selecting a stored broadcast portion. A system for providing an on-demand interactive magazine comprises a receiver operable to receive a magazine and data associated with the magazine, a receiver operable to receive at least one broadcast, a storage device, and a processor configured to use the data to store portions of the broadcasts and present the magazine to a viewer.

Abstract: In an interactive television system, an interactive television receiver can receives a carousel over a broadcast path. The broadcast server may run a carousel manager, and the carousel manager may formulate a broadcast policy to be used in constructing the carousel. The interactive television receiver may run a interface module that can process resource requests from an application program. The interface module may obtain a requested resource from the broadcast path or from a point-to-point path.

Abstract: A method and apparatus of communicating audio/video programs (e.g., television content associated with a plurality of channels) includes receiving the audio/video programs over a transport medium. A stream of ancillary data portions associated with a plurality of audio/video programs (e.g., a plurality of television channels or transport stream programs) may be received over a separate delivery mechanism. The ancillary data may include announcements associated with enhancement data according to an Advanced Television Enhancement Forum Specification, for example. One of the audio/video programs is tuned to, with one or more ancillary data portions located and identified with the tuned audio/video program. A special announcement in the ancillary data portions delivered to an expected location is used to locate announcements for the tuned audio/video program.

Abstract: A method for allowing a user PC (1702) to be controlled in order to effect a connection between the user PC (1702) and a destination node (1706) on a network (306). This is facilitated through an audio source (1700) wherein compact disk recording media has embedded therein an audio signal. When the compact disk recording media is played, the audio signal is extracted by an audio extractor (1600) and transmitted to the user PC, and detected by a program running in the background of the user PC (1702). Once the audible tone is detected, a web browser is launched and the tone or decoded product identifier information associated with the tone is transmitted to an ARS (308) on the network (306). The ARS (308) then compares the information received from the user PC (1702) using information from a relational database (1704). The relational database (1704) contains routing information for various destination nodes (1706) on the network.

Abstract: Content with a plurality of treatments, in the form of a movie, video, text, animation, music, etc., is stored on a network, each treatment having a storyline connection with all the other treatments. Subscribers to the content are classified in a subscriber tier based on subscription fee amounts. A top-level tier is capable of choosing a first and second sub-set of elements of a main presentation, e.g. a movie. The elements, in the example of a movie, may include characters and movie genre. Each subscriber's choice, within a tier, is registered and the majority of the top level determines a first element in the movie. Each subscriber in the second highest level is able to adjust the storyline, which includes a first element determined by the first tier, by choosing a second element. A further tier of subscribers views the content as determined by the higher level tiers.

Abstract: In a broadcasting system, an electronic program guide (EPG) is used to determine what broadcast program is on a given channel at a given time in a given location. With the particular determined broadcast program as an input, timing offset objects defining interactive content related to the determined broadcast program can be retrieved from a timing offsets database. Each timing offset object specifies a time from the beginning of the program, an act to perform at the time, and a reference to interactive content on which to perform the act at the time. With the reference to the interactive content as an input, an interactive application or other interactive content can be retrieved from an interactive content database. The EPG, the timing offsets database, and the interactive content database may be located logically or physically together or separately, and they may be cached locally or referenced from an external source.

Abstract: Radio waves transmitted from the antenna of a broadcasting station are received by the antenna of a television receiver. The television receiver extracts an EPG from the received radio waves and transmits it to a remote controller via an infrared transmission/reception section. The remote controller displays the received EPG on a LCD and is then rendered in a state of waiting for selection of a program. If some program is selected and then a reserve button is manipulated, the remote controller transmits a control command for a recording reservation to a video tape recorder. The video tape recorder receives the control command with an infrared transmission/reception section, whereby the recording reservation of the designated program is set.

Abstract: A method for sending data from a transmit site to a receive site which includes dividing a transmit data stream having a first bit rate into multiple data streams with each of the multiple data streams having a bit rate which is lower than the first bit rate, transmitting each of the multiple data streams over a plurality of RF channels and recombining the multiple data streams at the receive site to provide a receive data stream having a bit rate equal to the first bit rate.

Abstract: Systems and methods for displaying Internet content associated with television programming. Content associated with a program included in the television programming is automatically displayed by a set top box. Before the broadcast of a program, listing information or EPG data is stored at the set top box. The listing information includes batch mode logical addresses or links. During the program, a viewer is notified about the link, and the content may be accessed and displayed concurrently with the program. In addition, real-time logical addresses or links, which are embedded in the program, may be extracted and the viewer is notified of these links. If both the real time and batch links are available, a determination is made according to pre-defined rules regarding which link is brought to the attention of the viewer.

Abstract: Through the association of an IP address with each data stream, a single system may be used by a network card or a tuner to select multicast IP data. Each data stream is identified by a unique IP address. More particularly, a locator adapted for identifying a data stream is associated with one of a plurality of data streams. The locator is then mapped to an IP address. When it is determined that the IP address corresponds to a data stream locator associated with a data stream, a tuner is instructed to read the data stream associated with the data stream locator. However, when it is determined that the IP address does not correspond to a data stream locator, a network card identified by the IP address is instructed to read data from the associated network. Since each data stream may be associated with a plurality of multicast IP addresses, a multicast group address is specified to identify the appropriate multicast IP data transmitted in the data stream.

Abstract: A telephone interface and voice recognition driven Internet browser system and method for accessing/browsing the Internet on a cable or satellite television includes a phone for receiving a voice signal from a user. The voice signal controls a telephone interface which displays Internet contents on the television via a cable or satellite television channel. The system also includes a voice recognizer, preferably operated on a supercomputer, for recognizing/interpreting/analyzing the voice signal and generating command signals to access/browse the Internet. The voice recognizer is capable of recognizing/interpreting/analyzing voice signals transmitted from a plurality of users in real time. The system further includes a stack of computers and an Internet browser. Each of the stack of computers is capable of accessing/browsing the Internet and retrieving/organizing requested Internet contents via the Internet browser.

Abstract: A data broadcasting system of the present invention transmits contents used in a program and presentation control data specifying the manner of presentation of each content, in multiplex by assigning in arbitrary channels in each program. In this system, plural contents groups composed of at least one of real time reception type contents selectively received and reproduced in real time in the receiving terminal device, first store type contents reproduced after being stored as reception is started by selection, second store type contents read and reproduced when selected as being automatically received and stored, and parallel contents combining the real time reception type contents and the first or second storing type contents are provided a series of program.

Abstract: A time sequential signal comprising audiovisual content and hyperlinks is received and displayed on a display device by the systems of the invention in a time sequential manner. The display of the time sequential signal is paused whenever a displayed hyperlink is selected. While pausing the display, data corresponding to any selected hyperlink is accessed and displayed on the display device. The corresponding data may comprise a web page accessed through the Internet or an interval page that is transmitted within the vertical blanking intervals of the time sequential signal. While pausing the display of the time sequential signal, the time sequential signal is recorded so that it can be viewed in the order it was recorded as soon as a resume display command is received by the system.

Abstract: A system and method for simultaneously accessing video data and Internet page data includes a format manager that inserts a video tag into page data to concurrently display a positionable video window and the page data upon the screen of a display device. The format manager reformats the displayed page data to avoid the video window when shown on the display device. The format manager also maintains the video window in a stationary position when a system user scrolls the page data in relation to the video window.

Abstract: A system and method for displaying still video images related to video content in an interactive broadcast television system. The system and method of the present invention may also be used for simulating an Internet home page on an interactive television system. The present invention thus supports hyperlinked web-like navigational capabilities in an interactive television system. According to the method of the present invention, the video delivery system provides or broadcasts one or more audio/video channels each comprising video content and also provides or broadcasts at least one still image channel comprising a plurality of still video images, preferably MPEG-2 compressed still images. The user or viewer can select options displayed on the television screen to view desired information.

Abstract: Described are methods and apparatus for enhancing an information resource, such as a Web page, simultaneously residing in memory on a number of remote receivers. A content creator, (e.g., a program producer, broadcaster, affiliate, cable company or satellite provider), embeds a trigger in a data service channel of a broadcast signal. The trigger includes a resource identifier unique to the information resource and a script capable of modifying the information resource. The script might be a script or a segment of a script written in a conventional scripting language. Each receiver that includes the targeted information resource monitors the data service channel of the broadcast video signal for script-bearing triggers directed to that resource. If a receiver receives a script-bearing trigger directed to the resident resource, the receiver executes the script contained within the trigger to alter the resource and/or the displayed video defined by the resource.

Abstract: A system is provided that can easily capture the same broadcast stream from an arbitrary application. An interface between application and a reception route selection mechanism describes in a unified mode a broadcast resource capture specification method and a communication resource capture specification method. The interface employs a description scheme in which an application does not recognize whether or not a broadcast stream is captured through broadcast or communication. In the reception route selection, the reception route selection mechanism checks for a broadcast time contained in the identifier of a broadcast stream to be input so that a zone where a broadcast time is earlier than the current time by using a communication resource receiver while a zone where the broadcast time is later than the current time is selected by using a broadcast resource receiver.

Abstract: A graphical user interface (GUI) includes a hyper text mark-up language (HTML) document. A video image from broadcast data is displayed in a same window with the HTML document.

Abstract: Hypervideo data is encoded with two distinct portions, a first portion which contains the video data and a second portion, typically much smaller than the first, which contains hyperlink information associated with the video data. Preferably, the first and second portions are stored in separate and distinct files. The encoding of the hyperlink information is preferably made efficient by encoding only key frames of the video, and by encoding hot link regions of simple geometries. A hypervideo player determines the hot link regions in frames between key frames by interpolating the hot link regions in key frames which sandwich those frames.

Abstract: In a broadcast digital video network, Internet HTML Web page data is formatted to fit within a standard MPEG-2 data packet structure, and multiplexed along with other MPEG-2 digital video signals for transport within a multiple channel digital video system. The headend server broadcasts a rotating carousel comprising an ensemble of Web pages in HTML format containing both broadcast Web pages and simulcast Web pages and a control map permitting the viewer to navigate among the HTML Web pages. The control map containing the locations of the HTML Web pages in the rotating carousel that correspond to broadcast Web pages and the locations of the HTML Web pages that correspond to broadcast Web pages. The control map is updated and rebroadcast for each broadcast video program, thereby synchronizing the simulcast Web pages to the digital video programs.

Abstract: A system and method are provided for providing Internet addresses corresponding to an electronic signal, such as a video or audio program, to a user. The system includes a receiver for receiving at least one electronic signal, where the electronic signal includes one or more Internet addresses embedded therein. A decoder in communication with the receiver is operable to extract the one or more Internet addresses from the electronic signal. The system further includes a processor in communication with the decoder. The processor compiles a historical list of the one or more Internet addresses extracted from the electronic signal, and includes memory for storing the historical list. A web browser connected to the processor is operable to present the historical list of Internet addresses to the user.

Abstract: A device and method of displaying images and data on a display device. The device and method displays still and moving images in which at least one icon is associated and displayed with each image on a screen. A single screen may contain several images which change over time. As the images change so do the icons associated with them. Upon selection of an icon by a viewer, the device and method will display one of several possible advertisements or information associated with the icon. The selection of which advertisement or piece of information is based on information stored about the viewer. This information would include data concerning the viewer's age, income, address and hobbies. A list of selections made by a viewer is maintained and may be displayed at the viewer's request. The system may also force the display of advertisements if desired by advertisers.

Abstract: According to various aspects of the present invention, methods and systems are provided for informing users of an interactive television service of available content during an advertisement or via an electronic program guide. A hot key signal is inserted into a content signal transmitted to the one or more users from an interactive television service provider via a network with which the one or more users and the interactive television service provider are connected. If the hot key signal is relevant to the user, an indication that the hot key signal has been received is displayed on the screen. If the user accepts the hot key, the user is redirected to the alternate content or is provided additional information regarding the available content.

Abstract: A method and apparatus are described that provide message notification to users of an interactive television service. According to one aspect of the present invention, a method comprises determining whether to inform a user of the interactive television service of receipt of an email message. Responsive to determining to inform the user of the receipt of the email message, a hot key signal is generated indicating availability of the email message. The hot key signal is inserted into a content signal transmitted to the user from the interactive television service provider via a network. Once the hot key signal is received, a determination is made whether the hot key signal is relevant to the user. Responsive to determining the hot key signal is relevant to the user, an indication that the hot key signal has been received is displayed on a screen.

Abstract: Described are a method and apparatus for incorporating broadcast television into Web pages. Broadcast television can be embedded into Web pages using, for example, a “tv:” attribute in conjunction with common HTML tags. Within the “tv:” attribute, a Web-page author can reference a TV station by channel number, network, or broadcast call letters. HTML documents are parsed to recover both the conventional tags and tags that include TV attributes. The resulting Web pages display the identified broadcast TV in a frame specified by the TV attribute. One embodiment supports the presentation of television in the background of an HTML document. In that embodiment, HTML tags corresponding to overlying HTML content are provided with an attribute that defines a level of transparency from zero to one-hundred percent. The transparency attribute allows content providers to overlay any type of HTML information over a broadcast television show without completely obscuring the underlying show.

Abstract: According to one aspect of the present invention, a method of providing enhanced hot key functionality comprises receiving a hot key signal from an interactive television service provider's network. The hot key signal indicates availability and a location of alternate content. A determination is made whether the hot key signal is relevant to a user viewing original content from the interactive television service provider. Responsive to determining the hot key signal is relevant to the user, an indication that the hot key signal has been received is displayed on the screen. Responsive to receiving an indication that the hot key is accepted, a determination is made regarding a location on a screen for the alternate content and the original content and the alternate content are displayed in a Picture-In-Picture mode.

Abstract: A TV tag embedded in web-based content can be selected by a viewer to cause a system to perform an operation associated with the TV tag. Example operations include personalization of a TV planner to include programs that are related to the selected TV tag, scheduling of a particular program to be recorded, generation of an email reminder to be sent when a particular program is scheduled for broadcast, and so on. In an implementation that includes a TV planner, the TV planner may be personalized to include programs associated with a television series, an episode, a movie, a celebrity, a sports team, a topic, and/or a particular channel.

Abstract: According to one aspect of the present invention, systems and methods are provided for informing a user of an interactive television service of available content from an Internet web site and redirecting the user to the Internet content responsive to selection of a hot key embedded in content signals. According to another aspect of the present invention, systems and methods are provided for caching alternate content on a user's terminal device and redirecting the user to the cached content responsive to selection of a hot key embedded in content signals.

Abstract: An interactive television system includes “connected” receiver units capable of establishing bi-directional connections to remote information stores, such as Web servers, and “disconnected” receiver units unequipped to make such connections. The system supports the use of broadcast triggers that include connectivity values indicating whether an information resource identified by a trigger refers to “connected content” or “disconnected content.” The term “connected content” refers to information resources that require bi-directional connections to remote information stores; the term “disconnected content” refers to information resources, such as a locally stored program guide, that do not require such bi-directional connections. Disconnected receiver units identify and reject connected-content triggers by examining connectivity values broadcast as part of triggers.

Abstract: A digital television translator includes a digital television receiver for receiving a first digital television signal at a first frequency and generating a digital transport stream from the first digital television signal. The digital transport stream can include original Program and System Information (PSIP) data having RX channel data that is indicative of the first frequency, the first major channel number, and/or the first minor channel number. The digital television translator also includes a PSIP update module for updating the original PSIP data in the digital transport stream by replacing the RX channel data with TX channel data. The TX data is indicative of a second frequency, a second major channel number, and/or a second minor channel number.

Abstract: A media content distribution system comprising a media source unit for transmitting media content, a media destination unit for receiving media content, and a media management unit for accepting inputs from the media source unit and outputting to the media destination unit. The system allows for redirecting media content directly from the media source unit to the media destination unit by an alternating path when the media management unit fails. The distribution system further includes a set of protocols and behaviors in the media source unit and the media destination unit to insure that in the case of failure by the media management unit, the media source unit and the media destination unit will become aware of the failure and redirect the media content along an alternate path to the user.

Abstract: A digital residential entertainment system is disclosed recording video data of an event. One component of this digital residential entertainment system is a set-top box decoding digital signals. The set-top box includes a processor communicating with memory and an input to a data switch interface. The data switch interface receives digital information from a data switch.

Abstract: A network interface device connectable to a network, the device being arranged to receive a digital video data stream of a first resolution and, substantially in real time, to launch data packets representing the digital video data stream onto the network, comprises:

Abstract: A method, system, and computer readable code for extending payment protocols to include information related to the television context of commercial activity between a consumer using a television (or a set-top box) and a merchant, thereby enabling “TV commerce” to generate additional revenue streams which may include payments to the operator of the television system, as well as to various other parties (such as a cable or satellite provider who is providing the broadcast, the ad agency responsible for creating the advertisement from which the consumer made his purchase, etc.) involved with television advertisements and programs. A number of different payment protocols may be used for these TV commerce transactions, where the protocol messages are then augmented according to the present invention to include TV context data.

Abstract: Method and apparatus to carry out wideband DOCSIS both upstream and downstream in a point-to-multipoint environment of an HFC system using port trunking concepts. For the downstream, each CMTS has a frame distributor which distributes frames to various transmitters transmitting on downstream channels to be used to transmit downstream data simultaneously to a CM using wideband DOCSIS. The frame distributor adds sequence numbers in some embodiments to guarantee proper order of frames can be restored at the CM, and schedules transmissions according to quality of service considerations to meet guranteed and committed portions of constant bit rate and variable bit rate flows. The CMTS sends and Extended Channel Enable (ECE) message to wideband capable CMs telling them which downstreams to enable. Each CM has a frame collector to which all frames received on various downstream channels are sent. The frame collector makes sure they are all there, puts them into the proper order and delivers them to a NI.

Abstract: A controller (1) and target devices (2, 3) are connected via a network. The controller (1) displays an operation panel for controlling the target device (2) at a display device (10) based on information from the target device (2). The controller (1) is capable of changing an element and a user action of the operation panel based on data obtained by data broadcast.

Abstract: An Internet-enabled television system provides an electronic program guide for the radio (radio EPG) depicting radio programs available via the Internet. The radio EPG displays the programming available for a plurality of radio stations and time slots. The radio EPG is interactive in that a user may select a radio program for immediate playback or future recording. Radio programs are continuously received and cached by the Internet-enabled television system such that a user may be able to select and listen to an earlier-broadcast radio program listed in the radio EPG.

Abstract: A personal computer connected to the Internet can receive and store audio and audiovisual data or programming from the Internet. This audio and audiovisual programming can be provided by the computer over a digital connection to speakers and/or a monitor located away from the computer at a location convenient for a user. A remote control unit allows the user to send signals back over the digital connection to the computer to control the computer to provide the audio or audiovisual programming that the user desires over the digital connection to the speakers and/or monitor located where the user is. The computer may send a listing of the available programming to the remote control unit from which the user can make selections.

Abstract: An HTTP based video streaming apparatus and method of a mobile communication system is disclosed. A memory, such as a storing disk, stores content files received from a server of a transmitting party, a random access searching unit searches the random access point in the memory and transmits a content file request message to the transmitting server if the random access point does not exist in the memory, and a display unit displays the files from the random access point. Therefore, HTTP streaming service from a random point required by a user can be provided when the streaming has begun, and the random access function can be supported by even if the part required by the user has not yet been transmitted to receiving party.