An approach is provided for determining a program clock reference (PCR) value validity, for avoiding inaccurate variable delay reference (VDR) values, and for avoiding a mismatch in a data packet between a sequence number and a packet number for a wireless display extension. The approach involves determining to generate a data packet carrier having an optional PCR value, a VDR) value, and a validity indicator. The approach may further involve processing the data packet carrier to determine whether the data packet carrier has the optional PCR value. The approach may also involve causing, at least in part, a surrogate PCR value to be generated based, at least in part, on a determined absence of the optional PCR value from the data packet carrier.

A method for generating time marking for synchronous terrestrial broadcasting in at least one single-frequency zone of at least one audiovisual stream via at least one connection in which the at least one audiovisual stream is multiplexed with at least one other audiovisual stream broadcast via the at least one connection, the method including: inserting packets including at least one item of information representing a common reference clock, detecting at least one packet including information representing the number of days elapsed since a predetermined date, calculating the number of loopbacks of a counter during a given period, updating the counter at each packet of the audiovisual stream transmitted, inserting at least one packet including the value of the updated counter in the audiovisual stream in order to form a modified audiovisual stream and transmitting the modified audiovisual stream.

Systems and methods for multiplexing audio/video data and generating transport streams for WiFi network with reduced latency for real time playback at a remote device. A virtual presentation clock reference (PCR) representing a scheduled transmission time of a transport stream packet at a transport stream multiplexer is calculated based on the network transmission rate and generation of the data packets. The virtual PCR is compared with the corresponding system PCR to derive a time difference. Based on the time difference, the transport stream multiplexer is configured to adaptively drop packets or throttle packet generation so as to synchronize the playback of audio/video data on a sink device with the generation of interleaved audio/video packets.

A television program switching method and apparatus, relate to the field of communications network technologies and applicable to television program switching, thereby resolving a problem of cumbersome user operations of viewing television program information. The method includes a program selection instruction entered by a user is received when an electronic program guide (EPG) screen is displayed on a mobile terminal, where the program selection instruction includes a program identifier, and the EPG screen includes at least two program identifiers and first program information corresponding to each program identifier, the EPG is searched for program frequency information corresponding to the program identifier according to the program identifier, and the program frequency information is sent to a to-be-controlled television.

A method and an apparatus are used to target interactive virtual objects to subscribers in a television delivery system. Programs are selected and virtual object locations are defined in the selected programs. The virtual objects available for targeting are categorized and the categories are correlated to subscriber information to determine the optimum targeting of the virtual objects. The virtual objects may be targeted based on individual subscriber information or on information related to groups of subscribers. When a frame of a program includes a virtual object location, a default or an alternate virtual object is displayed. The virtual object location may change over space or time. The virtual object may be interactive, and may be used to link a subscriber to a remote location, such as an Internet web site. An operations center or a cable headend may generate a group assignment plan that assigns the subscribers' television terminals to groups, based on factors such as area of dominant influence and household income. A retrieval plan is then generated that instructs the television terminals to select the desired virtual object for display. The television terminals record which virtual objects were displayed, and report this information to the cable headends and the operations center. The reported information is used to generate billing for commercial advertisers, and to analyze viewer watching habits. Interactive virtual objects are received by the television terminal with directions on actions to be taken upon selection of the interactive virtual object. Actions may result in the initiation of processes locally at the television terminal, or communication with a remote site for the initiation of processes to be performed remotely. The invention uses upstream data reception hardware, databases and processing hardware and software, and corresponding features in the televisions to accomplish these functions.

Disclosed are a method and a system for providing media streaming by interworking heterogeneous network through a mobile communication network. A method for providing media streaming by interworking heterogeneous network may comprises receiving media data corresponding to media stream requested by a media streaming server from media streaming encoders, multiplexing the received media data in a predefined transport stream format, and performing streaming transport of the multiplexed media data to the media streaming server through a mobile communication network and an internet wired network.

A switching device determines a video parameter value of a switching point of a first video stream, and determines a video parameter value of a switching point of a second video stream. The video parameter value includes a timestamp and/or a sequence number. The switching device determines an audio parameter value of a switching point of a first audio stream based on a timestamp of the switching point of the first video stream, and determines an audio parameter value of a switching point of a second audio stream based on a timestamp of the switching point of the second video stream. The audio parameter value includes a timestamp and/or a sequence number. The switching device performs switching based on determined switching points.

A switching device determines a video parameter value of a switching point of a first video stream, and determines a video parameter value of a switching point of a second video stream. The video parameter value includes a timestamp and/or a sequence number. The switching device determines an audio parameter value of a switching point of a first audio stream based on a timestamp of the switching point of the first video stream, and determines an audio parameter value of a switching point of a second audio stream based on a timestamp of the switching point of the second video stream. The audio parameter value includes a timestamp and/or a sequence number. The switching device performs switching based on determined switching points.

The present disclosure aims to provide a method for detecting a GOP boundary of an encoded bit stream of each layer and associating GOPs of the layers for hierarchical transmission in a video transmission device that transmits a hierarchically encoded bit stream. The present disclosure provides a video transmission device and a video transmission method that detect a GOP head access unit in a base layer of a hierarchically encoded bit stream by analyzing the base layer and detect a head access unit of an enhancement layer of an identical GOP to that of the aforementioned access unit from a decoding time stamp of the access unit by using the relationship between a decoding time stamp of the base layer and a decoding time stamp of the enhancement layer.

A re-multiplexing apparatus, a broadcasting system, a re-multiplexing method, and a program capable of, when broadcast data having a first resolution and broadcast data having a second resolution are broadcasted, synchronizing their outputs with each other are provided. A re-multiplexing apparatus includes a first re-multiplexing unit and a second re-multiplexing unit. The second re-multiplexing unit inserts a delay control packet at a timing corresponding to a timing of a first packet of an OFDM frame, the delay control packet being a packet containing control information for compensating for a difference between delay times of the first and second lines. When doing so, the second re-multiplexing unit generates, as the control information, an index value of a waiting time from a time when the delay control packet is received in a transmitting apparatus to a start of a modulation process for a packet following the delay control packet.