Abstract: The present disclosure relates to the field of OLED technologies and provides a compound having TADF property. In an embodiment, the compound has a structure represented by Formula (1), in which L1 and L2 are each a hydrogen atom, phenyl, naphthyl, anthracyl, pyridyl, pyrimidinyl, and pyrazinyl; R1 and R2 are each aryl or and heteroaryl, such as a carbazole-derived group, an acridine-derived group, diarylamino, a diarylamine-derived group, and the like. In the present disclosure, the double boron heterocyclic structure functions not only as an electron acceptor but also as a linker. In the compound according to the present disclosure, by attaching a group having a large steric hindrance to the boron atom of the boron heterocyclic ring, the molecules the compound are prevented from aggregating, and thus a ?-aggregation or excimer formed by direct accumulation of the conjugate plane is avoided, thereby improving the light-emitting efficiency.

Abstract: The present disclosure provides a thermally activated delayed fluorescent material and application thereof, the thermally activated delayed fluorescent material is a compound having a structure represented by Formula I and can be used as a light-emitting layer material of an organic electroluminescent device. The thermally activated delayed fluorescent material is applied to an organic electroluminescent device comprising an anode, a cathode, and at least one organic thin film layer between the anode and the cathode, the light-emitting layer in the organic thin film layer comprises any one or a combination of at least two of the thermally activated delayed fluorescent materials. An energy level difference between the triplet state and the singlet state of the thermally activated delayed fluorescent material provided by the present disclosure can be reduced to below 0.

Abstract: Devices and methods for determining whether to initiate random access during decoding of video information. In one aspect, a device may include a memory configured to store video information that includes at least one recovery point supplemental enhancement information (SEI) message and a processor coupled to the memory. The processor is configured to determine whether the at least one recovery point SEI message comprises an indication to reset a picture order count (POC) semantic value. The processor is further configured to identify at least one of a first constraint regarding whether the recovery point SEI message is present in an access unit, a second constraint regarding an association of the recovery point SEI message with a picture, or a third constraint and determine whether to initiate the random access and decoding from the access unit based on at least one of the first constraint or the second constraint.

Abstract: Techniques for encapsulating video streams containing multiple coded views in a media file are described herein. In one example, a method includes parsing a track of video data, wherein the track includes one or more views. The method further includes parsing information to determine whether a texture view or a depth view of a reference view is required for decoding at least one of the one or more views in the track. Another example method includes composing a track of video data, wherein the track includes one or more views and composing information that indicates whether a texture view or a depth view of a reference view is required for decoding at least one of the one or more views in the track.

Abstract: An example method for encoding or decoding video data includes storing, by a video coder and in a reference picture buffer, a version of a current picture of the video data, including the current picture in a reference picture list (RPL) used to predict the current picture, and coding, by the video coder and based on the RPL, a block of video data in the current picture based on a predictor block of video data included in the version of the current picture stored in the reference picture buffer.

Abstract: A compound, having a structure represented by Formula (I), in which L is selected from the group consisting of a substituted or unsubstituted phenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrimidinyl, and a substituted or unsubstituted pyrazinyl; and D is an electron donor and is selected from the group consisting of a substituted or unsubstituted phenyl, biphenyl, naphthyl, anthryl, phenanthryl, acenaphthylenyl, pyrenyl, perylenyl, fluorenyl, spirobifluorenyl, chrysenyl, benzophenanthrenyl, benzanthracenyl, fluoranthenyl, picenyl, furyl, benzofuryl, dibenzofuryl, thienyl, benzothienyl, dibenzothiophenyl, phenoxazinyl, phenazinyl, phenothiazinyl, thianthrenyl, carbazolyl, acridinyl, and diarylamino.

Abstract: A method of three hundred and sixty degree)(360° streaming implemented by a client device. The method includes receiving, by the client device, a media presentation description (MPD) file from a content server, the MPD file describing a media content, the media content comprising a plurality of viewpoints each corresponding to one of a plurality of 360° video camera sets; transmitting, by the client device, a request for a part of the media content based on the MPD file that was received; receiving, by the client device, the part of the media content that was requested; rendering, by the client device, a viewport using the part of the media content that was received, the viewport belonging to one viewpoint from the plurality of viewpoints; and generating, by the client device, a metric containing a viewpoint identifier, the viewpoint identifier identifying the viewpoint that the viewport that was rendered belongs to.

Abstract: A video coder may reconstruct a current picture of video data. A current region of the current picture is associated with a temporal index indicating a temporal layer to which the current region belongs. Furthermore, for each respective array of a plurality of arrays that correspond to different temporal layers, the video coder may store, in the respective array, sets of adaptive loop filtering (ALF) parameters used in applying ALF filters to samples of regions of pictures of the video data that are decoded prior to the current region and that are in the temporal layer corresponding to the respective array or a lower temporal layer than the temporal layer corresponding to the respective array. The video coder determines, based on a selected set of ALF parameters in the array corresponding to the temporal layer to which the current region belongs, an applicable set of ALF parameters.

Abstract: Techniques are described related to output and removal of decoded pictures from a decoded picture buffer (DPB). The example techniques may remove a decoded picture from the DPB prior to coding a current picture. For instance, the example techniques may remove the decoded picture if that decoded picture is not identified in the reference picture set of the current picture.

Abstract: A method mechanism for streaming multi-viewpoint virtual reality (VR) content via Dynamic Adaptive Streaming over Hypertext Transfer Protocol (HTTP) (DASH) is disclosed. The mechanism includes receiving media content including a VR video sequence. A DASH Media Presentation Description (MPD) is generated. The MPD includes an indication specifying that a portion of the media content that is related to a first viewpoint is associated with a timed metadata representation. A request is received from a client for the media content. The DASH MPD, including the indication, is transmitted to the client in response to receiving the request to support communication of the media content to the client.

Abstract: A method of encoding video data comprising encoding a current picture of video data, generating a respective collocated reference picture index syntax element for one or more slices of the current picture, and performing a bitstream conformance check only for slices of the one or more slices that do not have an intra slice type and for which a temporal motion vector predictor is enabled, the bitstream conformance check constraining the values of the respective collocated reference picture index syntax elements such that each respective collocated reference picture index syntax element points to the same picture and does not reference the current picture itself.

Abstract: In one example, a device for retrieving media data includes one or more processors implemented in circuitry and configured to parse system level information of a media bitstream encapsulating a video elementary stream, the system level information indicating that the video elementary stream includes one or more supplemental enhancement information (SEI) messages and payload types for each of the SEI messages, extract the one or more SEI messages and the payload types from the system level information, and send the one or more SEI messages and the payload types to one or more other processing units of the device.

Abstract: A device for processing media data is configured to receive media data including virtual reality (VR) video data; determine, based at least in part on data signaled at an adaptation set level of a media presentation description for a media presentation, a projection mapping used in the media presentation; process segments of a video representation of the media presentation based on the projection mapping used in the media presentation. A device for processing media data is configured to generate media data that includes VR video data; include in the media data, data signaled at an adaptation set level of a media presentation description that identifies a projection mapping used in media presentation included in the media data; and send segments of a video representation of the media presentation based on the projection mapping used in the media presentation.

Abstract: Techniques for encapsulating video streams containing multiple coded views in a media file are described herein. In one example, a method includes parsing a track of multiview video data, wherein the track includes at least one depth view. The method further includes parsing information to determine a spatial resolution associated with the depth view, wherein decoding the spatial resolution does not require parsing of a sequence parameter set of the depth view. Another example method includes composing a track of multiview video data, wherein the track includes the one or more views. The example method further includes composing information to indicate a spatial resolution associated with the depth view, wherein decoding the spatial resolution does not require parsing of a sequence parameter set of the depth view.

Abstract: An example device for retrieving media data includes one or more processors configured to retrieve a manifest file specifying data for at least one representation of a media presentation, wherein the manifest file includes data that specifies one or more codecs for the at least one representation, extract, from the manifest file, the data that specifies the one or more codecs, the data including a first element representing a sample entry type code of a track of the at least one representation, wherein the first element represents the sample entry type code using a restricted scheme, and a second element representing a restricted scheme type code for the restricted scheme of the track, and retrieve the media data of the at least one representation based on the first element and the second element.

Abstract: Techniques for encapsulating video streams containing multiple coded views in a media file are described herein. In one example, a method includes parsing a track of multiview video data, wherein the track includes at least one depth view. The method further includes parsing information to determine a spatial resolution associated with the depth view, wherein decoding the spatial resolution does not require parsing of a sequence parameter set of the depth view. Another example method includes composing a track of multiview video data, wherein the track includes the one or more views. The example method further includes composing information to indicate a spatial resolution associated with the depth view, wherein decoding the spatial resolution does not require parsing of a sequence parameter set of the depth view.

Abstract: A mechanism implemented in a Dynamic Adaptive Streaming over Hypertext Transfer Protocol (HTTP) (DASH) network is disclosed. The mechanism includes receiving a DASH Media Presentation Description (MPD) describing media content including a virtual reality (VR) video sequence. The media content is obtained based on the MPD. The media content is forwarded to one or more rendering devices for rendering. A rendered viewports metric is determined that includes viewport information for the VR video sequence as rendered by the one or more rendering devices. The rendered viewports metric includes a plurality of entries with at least one of the entries indicating a viewport and a plurality of media samples of the VR video sequence applied to the viewport. The rendered viewports metric is transmitted toward a provider server.

Abstract: A mechanism implemented in a Dynamic Adaptive Streaming over Hypertext Transfer Protocol (HTTP) (DASH) network is disclosed. The mechanism includes receiving a DASH Media Presentation Description (MPD) describing media content including a virtual reality (VR) video sequence. The media content is obtained based on the MPD. The media content is forwarded to a plurality of rendering devices for rendering. A display information set metric is determined that includes display information of the VR video sequence as rendered by the rendering devices. The display information set metric is transmitted toward a provider server.

Abstract: A mechanism implemented in a Dynamic Adaptive Streaming over Hypertext Transfer Protocol (HTTP) (DASH) client-side network element (NE), is disclosed. The mechanism includes receiving a DASH Media Presentation Description (MPD) describing media content including a virtual reality (VR) video sequence. The media content is obtained based on the MPD. The media content is forwarded to one or more rendering devices for rendering. A rendered FOV set metric is determined that indicates a plurality of fields of views (FOVs) of the VR video sequence as rendered by the one or more rendering devices. The rendered FOV set metric is transmitted toward a provider server.

Abstract: A method of processing video data. The method includes determining, based on a signaled property of a bitstream that comprises an encoded representation of the video data, whether a video decoder is able to properly render decoded pictures obtained from decoding the bitstream. The signaled property has a particular value indicating that the bitstream does not contain any fisheye omnidirectional video pictures. The method further includes processing, based on the determination, the bitstream.