Normative indication of recovery point
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsMartin Pettersson, Rickard Sjöberg, Mitra Damghanian
Life of this patent
Estimating the term…
Abstract
A method for decoding a video bitstream comprising a sequence of pictures comprising a picture A and a picture B, wherein picture A starts a recovery point period and picture B ends the recovery point period. The method includes obtaining the video bitstream and decoding from the video bitstream a normative indication of the recovery point period. The normative indication of the recovery point period indicates that picture A starts the recovery point period and/or that picture B ends the recovery point period.
Claims16
A method implemented by a decoder for decoding a video bitstream, the method comprising:
- obtaining the video bitstream, wherein the video bitstream comprises a coded video sequence (CVS) comprising a sequence of access units (AUs) containing a sequence of coded pictures;
- decoding from the CVS an indication that a current picture is a gradual decoder refresh (GDR) picture contained in a GDR AU that starts the CVS;
- and
- decoding from a picture header (PH) of the GDR picture an indication of a recovery point in the CVS, wherein the recovery point is associated with the GDR picture and the indication of the recovery point comprises an indication of the position of a recovery point picture in the sequence of coded pictures, wherein
- decoding the indication of the recovery point in the CVS from the PH comprises obtaining the indication of the recovery point from a network abstraction layer (NAL) unit of type PH.
A method for encoding a bitstream, the method comprising:
- determining that a coded video sequence (CVS) of access units, AUs, in the bitstream is to begin with a GDR AU containing a GDR picture, the CVS of AUs containing a sequence of coded pictures that begins with the GDR picture and includes an associated recovery point;
- encoding in the CVS an indication of the GDR picture;
- and
- encoding in a picture header of the GDR picture an indication of the recovery point associated with the GDR picture, wherein the indication of the recovery point comprises an indication of a position of a recovery point picture in the sequence of coded pictures, wherein
- encoding in the picture header of the GDR picture the indication of the recovery point comprises encoding the indication of the recovery point in a network abstraction layer (NAL) unit of type picture header (PH).
A decoding apparatus for decoding a video bitstream comprising a coded video sequence (CVS) of access units (AUs) containing a sequence of coded pictures, the decoding apparatus comprising:
- a memory;
- and
- processing circuitry, wherein the decoding apparatus is configured to perform a process that comprises:
- obtaining the video bitstream;
- decoding from the CVS an indication that a current picture is a gradual decoder refresh (GDR) picture contained in a GDR AU that starts the CVS;
- and
- decoding from a picture header of the GDR picture an indication of a recovery point in the CVS, wherein the recovery point is associated with the GDR picture and the indication of the recovery point comprises an indication of the position of a recovery point picture in the sequence of coded pictures, wherein
- decoding the indication of the recovery point in the CVS from the PH comprises obtaining the indication of the recovery point from a network abstraction layer (NAL) unit of type PH.
An encoding apparatus for encoding a bitstream, the encoding apparatus comprising:
- a memory;
- and
- processing circuitry, wherein the encoding apparatus is configured to:
- determine that a coded video sequence (CVS) of access units (AUs) in the bitstream is to begin with a gradual decoder refresh (GDR) AU containing a GDR picture, the CVS of AUs containing a sequence of coded pictures that begins with the GDR picture and includes an associated recovery point;
- encode in the CVS an indication of the GDR picture;
- and
- encode in a picture header of the GDR picture an indication of the recovery point associated with the GDR picture, wherein the indication of the recovery point comprises an indication of a position of a recovery point picture in the sequence of coded pictures, wherein
- encoding in the picture header of the GDR picture the indication of the recovery point comprises encoding the indication of the recovery point in a network abstraction layer (NAL) unit of type picture header (PH).
Dependencies are inferred from the claim text.