Normative indication of recovery point
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsMartin PETTERSSON, Rickard SJÖBERG, Mitra DAMGHANIAN
Life of this patent
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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.
Claims20
1-17. (canceled)
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;
- obtaining from the CVS an indication that a current picture is a gradual decoding refresh (GDR) picture contained in a GDR AU that starts the CVS;
- and
- obtaining from header data associated with 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
- obtaining the indication of the recovery point from the header data comprises
- i) obtaining the indication of the recovery point from a network abstraction layer (NAL) unit of type picture header, PH, or
- ii) obtaining the indication of the recovery point from a slice header in the GDR picture.
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 into header data associated with 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 into the header data associated with the GDR picture the indication of the recovery point comprises:
- i) encoding the indication of the recovery point into a network abstraction layer (NAL) unit of type picture header, PH, or
- ii) encoding the indication of the recovery point into a slice header in the GDR picture.
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;
- obtaining 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
- obtaining from header data associated with 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
- obtaining the indication of the recovery point from the header data comprises
- i) obtaining the indication of the recovery point from a network abstraction layer (NAL) unit of type picture header, PH, or
- ii) obtaining the indication of the recovery point from a slice header in the GDR picture.
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 into header data associated with 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 into the header data associated with the GDR picture the indication of the recovery point comprises
- i) encoding the indication of the recovery point into a network abstraction layer (NAL) unit of type picture header, PH, or
- ii) encoding the indication of the recovery point into a slice header in the GDR picture.
Dependencies are inferred from the claim text.