Abstract:
Example techniques are described to determine transforms to be used during video encoding and video decoding. A video encoder and a video decoder may select transform subsets that each identify one or more candidate transforms. The video encoder and the video decoder may determine transforms from the selected transform subsets.
Abstract:
In one example, a device for coding video data includes a memory configured to store video data and a video coder configured to form, for a current block of the video data, a merge candidate list including a plurality of merge candidates, the plurality of merge candidates including four spatial neighboring candidates from four neighboring blocks to the current block and, immediately following the four spatial neighboring candidates, an advanced temporal motion vector prediction (ATMVP) candidate, code an index into the merge candidate list that identifies a merge candidate of the plurality of merge candidates in the merge candidate list, and code the current block of video data using motion information of the identified merge candidate.
Abstract:
The example techniques of this disclosure are directed to default construction techniques for the construction of a combined reference picture list, and default mapping techniques for the combined reference picture list. In some examples, a video coder may construct first and second reference picture lists from frame number values, and construct the combined reference picture list from the frame number values of the first and second reference picture lists. In some examples, a video coder may construct first and second reference picture lists from picture order count (POC) values, and construct the combined reference picture list from the POC values of the first and second reference picture lists. In some examples, a video coder may construct a combined reference picture list from received information for the construction, and map the pictures of the combined reference picture list to one of a first or second reference picture list.
Abstract:
A system and method for processing video data having a first random access point (RAP) picture. An access unit having a first random access point (RAP) picture is received in a video bitstream. A subsequent access unit having a RAP picture that does not initialize the hypothetical reference decoder (HRD) is also received and, based on one or more random access skipped leading (RASL) pictures for the subsequent access unit not being present in the video bitstream, a picture buffer removal time for a picture buffer is shifted earlier based on a picture buffer removal delay offset.
Abstract:
A video parameter set (VPS) is associated with one or more coded video sequences (CVSs). The VPS includes a VPS extension for a video coding extension. The VPS extension includes a syntax element that indicates whether a video coding tool associated with the video coding extension is enabled for a set of applicable layers of a bitstream. When the syntax element indicates that the coding tool is enabled for the applicable layers, at least a portion of the video data that is associated with the CVSs and that is associated with the applicable layers is coded using the coding tool. When the syntax element indicates that the coding tool is not enabled for the applicable layers, the video data that is associated with the CVSs and that is associated with the applicable layers is not coded using the coding tool.
Abstract:
Techniques are described where if an inter-view predicted motion vector candidate (IPMVC) and an inter-view disparity motion vector candidate (IDMVC) are derived based on a shifted disparity vector, where the amount by which the disparity vector is shifted for the IPMVC and IDMVC is different. The techniques also prioritize the inclusion of the IPMVC over the IDMVC in a candidate list, and prune the IPMVC and the IDMVC if there is a duplicated IPMVC or IDMVC in the candidate list.
Abstract:
In an example, a method of coding multi-layer video data includes determining, for a first block of video data at a first temporal location, whether one or more reference picture lists for coding the first block contain at least one reference picture at a second, different temporal location. The method also includes coding the first block of video data relative to at least one reference block of video data of a reference picture in the one or more reference picture lists, where coding includes disabling an inter-view residual prediction process when the one or more reference picture lists do not include at least one reference picture at the second temporal location.
Abstract:
Techniques are described related to modifying an initial reference picture list. The example techniques may identify a reference picture in at least one of the reference picture subsets used to construct the initial reference picture. The example techniques may list the identified reference picture in a current entry of the initial reference picture list to construct a modified reference picture list.
Abstract:
In some example techniques for generating and updating depth map estimates used for inter-view motion prediction and/or inter-view residual prediction for coding multiview video data, each of a plurality of dependent views is associated with a dependent depth view estimate, which may be generated or updated based on coding of the texture data of the dependent view relative to a base view. In such examples, each of the dependent depth map estimates may be warped to the base view to produce a respective one of a plurality of base depth map estimates. Each dependent depth map estimate and the respective base depth map estimate for a depth map estimate pair associated with the respective one of the plurality of dependent views.
Abstract:
Systems, methods, and devices for processing video data are disclosed. Some examples systems, methods, and devices receive an external indication at a video decoder. The example systems, methods, and devices treat a clean random access (CRA) picture as a broken link access (BLA) picture based on the external indication.