A digital receiver for synchronizing multiple components delivered on a broadband network and a broadcast network, the digital receiver including a broadband network interface configured to receive broadband data including at least one audio component for a service via the broadband network, wherein the at least one audio component relates to a Dynamic Adaptive Streaming over HTTP (DASH) segment, wherein the broadband network comprises an internet network; a broadcast network interface configured to receive a broadcast signal including a video component for the service, first timing information, and second timing information via the broadcast network, wherein the broadcast signal further includes a MPD (Media Presentation Description) having a DASH representation containing a segment URL for the DASH segment delivered over the broadband network; and a processor configured to calculate an offset based on a receiver wall clock, and process at least one of the at least one audio component or the video component which is time-aligned based on the calculated offset.

To enable satisfactory decoding processing corresponding to a decoding capability on a reception side. Image data of pictures constituting moving image data are sorted into multiple hierarchies, image data of pictures of each of the sorted hierarchies are encoded, and video data including the encoded image data of the pictures of each of the hierarchies is generated. A container of a predetermined format including the video data is transmitted. The multiple hierarchies are divided into a predetermined number of hierarchy groups, the predetermined number being two or more, and identification information for identifying a hierarchy group to which encoded image data of each picture included in the video data belongs is inserted into a packet as a container of the video data.

To enable satisfactory decoding processing corresponding to a decoding capability on a reception side. Image data of pictures constituting moving image data are sorted into multiple hierarchies, image data of pictures of each of the sorted hierarchies are encoded, and video data including the encoded image data of the pictures of each of the hierarchies is generated. A container of a predetermined format including the video data is transmitted. The multiple hierarchies are divided into a predetermined number of hierarchy groups, the predetermined number being two or more, and identification information for identifying a hierarchy group to which encoded image data of each picture included in the video data belongs is inserted into a packet as a container of the video data.

The present invention provides a method for transmitting a broadcasting signal. A method for transmitting a broadcasting signal according to the present invention suggests a system capable of supporting a next generation broadcasting service in an environment which supports a next generation hybrid broadcast using a terrestrial broadcast network and an internet network. Furthermore, in an environment which supports a next generation hybrid broadcast, suggested is an efficient signaling scheme which can embrace both a terrestrial broadcast network and an internet network.

A method comprising: writing, in a container file, a first video-based point cloud compression (V-PCC) bitstream and a second V-PCC bitstream, wherein said first and second V-PCC bitstreams are associated with a common group based on at least one logical context; writing, in the container file, an indication about the common group between the first V-PCC bitstream and the second V-PCC bitstream; generating a media presentation description (MPD) file with a first representation belonging to a first adaptation set associated with the first V-PCC bitstream and a second representation belonging to a second adaptation set associated with the second V-PCC bitstream; and writing, in the MPD file, at least one information element describing grouping information of the first representation belonging to the first adaptation set and the second representation belonging to the second adaptation set, wherein said information element is provided with at least one attribute indicating that said first and second V-PCC bitstreams are user-switchable alternatives upon rendering.

The present invention provides an apparatus of transmitting broadcast signals, the apparatus including, an encoder for encoding service data, a frame builder for building at least one signal frame by mapping the encoded service data, a modulator for modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and a transmitter for transmitting the broadcast signals having the modulated data.

The present invention provides an apparatus of transmitting broadcast signals, the apparatus including, an encoder for encoding service data, a frame builder for building at least one signal frame by mapping the encoded service data, a modulator for modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and a transmitter for transmitting the broadcast signals having the modulated data.

This application provides a media data processing method and apparatus. A media processing device receives a media stream. The media stream includes media data recorded at a plurality of viewpoints. The device obtains metadata information of the media stream. The metadata information includes viewpoint identification information of the viewpoints. The device displays media data of a first viewpoint based on the viewpoint identification information. The device also displays indications of other viewpoints when displaying the media data of the first viewpoint, so that a user of the device can switch to display media data of other viewpoints.

In one example, a device for retrieving media data includes a memory configured to store media data, and a processor implemented in circuitry and configured to: process a descriptor of a manifest file of media content including the media data, the descriptor corresponding to an adaptation set of the media content and including data representative of a box of file level information that describes a property of a track of a media file of the media content including media data of the adaptation set, determine whether to retrieve the media data of the adaptation set according to the data representative of the file level information, and in response to determining to retrieve the media data, send a request to retrieve the media data.

In one example, a device for retrieving media data includes a memory configured to store media data, and a processor implemented in circuitry and configured to: process a descriptor of a manifest file of media content including the media data, the descriptor corresponding to an adaptation set of the media content and including data representative of a box of file level information that describes a property of a track of a media file of the media content including media data of the adaptation set, determine whether to retrieve the media data of the adaptation set according to the data representative of the file level information, and in response to determining to retrieve the media data, send a request to retrieve the media data.