Methods and systems for performing gradual decoding refresh processing on pictures

A method of decoding a bitstream to output one or more pictures for a video stream, the method comprising:

• receiving a bitstream;
• and
• decoding, using coded information of the bitstream, one or more pictures,
• wherein the decoding comprises:
• decoding a first flag indicating whether gradual decoding refresh (GDR) pictures are enabled in a video sequence, wherein the first flag has a first value indicating the GDR pictures are enabled in the video sequence or a second value indicating the GDR pictures are disabled in the video sequence;
• decoding a second flag indicating whether a picture is a GDR picture, wherein the second flag has a first value indicating the picture is a GDR picture or a second value indicating the picture is not a GDR picture;
• and
• when the second flag has the first value indicating the picture is a GDR picture, decoding a parameter indicating a recovery point picture of decoded pictures in an output order.

A non-transitory computer readable storage medium storing a set of instructions to cause one or more processors of a device to perform operations for decoding an encoded bitstream to output one or more pictures for a video stream, the operations comprising:

• acquiring the encoded bitstream comprising a first flag and a second flag;
• decoding the first flag indicating whether gradual decoding refresh (GDR) pictures are enabled in a video sequence, wherein the first flag has a first value indicating the GDR pictures are enabled in a video sequence or a second value indicating the GDR pictures are disabled in the video sequence;
• decoding the second flag indicating whether a picture is a GDR picture, wherein the second flag has a first value indicating the picture is a GDR picture or a second value indicating the picture is not a GDR picture;
• and
• when the second flag has the first value indicating the picture is a GDR picture, decoding a parameter indicating a recovery point picture of decoded pictures in an output order.