Arrangements and methods thereof for processing video

A parsing circuit for parsing bits representing at least a part of a current picture, wherein the current picture belongs to a temporal level identified by a temporal_id, wherein the current picture is associated with a Reference Picture Set (RPS) indicating reference pictures that are used when decoding the current picture, the parsing circuit comprising:

• at least one processor;
• and
• at least one memory storing program code that is executed by the at least one processor to perform operations comprising:
• determining that for the current picture, when being a temporal switching point, whether there is a picture included in the RPS of the current picture that has the same or higher temporal_id as the current picture;
• and
• when the current picture is a temporal switching point and is a temporal sub-layer access (TSA) picture, determine when coded pictures with temporal_id greater than or equal to the temporal_id of the TSA picture that follow the TSA picture in decoding order include any picture in their reference picture set that precedes the TSA picture in decoding order and for which temporal_id is greater than or equal to the temporal_id of the TSA picture.

A computer program product for encoding a current picture belonging to a temporal level identified by a temporal_id, the computer program product comprising:

• at least one non-transitory computer readable medium storing program code that is executable by at least one processor to perform operations comprising:
• determining a Reference Picture Set (RPS) for the current picture indicating reference pictures that are used when decoding the current picture;
• and
• encoding the current picture ensuring that the RPS of the current picture includes no picture having a temporal_id greater than or equal to the temporal_id of the current picture when the current picture is a temporal switching point, wherein the encoding is configured when the current picture is a temporal switching point and is a temporal sub-layer access (TSA) picture to trigger a parsing circuit performing parsing of bits representing at least a part of the current picture to determine when coded pictures with temporal_id greater than or equal to the temporal_id of the TSA picture that follow the TSA picture in decoding order include any picture in their reference picture set that precedes the TSA picture in decoding order and for which temporal_id is greater than or equal to the temporal_id of the TSA picture.

A computer program product for parsing bits representing at least a part of a current picture, wherein the current picture belongs to a temporal level identified by a temporal_id, wherein the current picture is associated with a Reference Picture Set (RPS) indicating reference pictures to be used when decoding the current picture, the computer program product comprising:

• at least one non-transitory computer readable medium storing program code that is executable by at least one processor to perform operations comprising:
• determining that for the current picture, when being a temporal switching point, whether there is a picture included in the RPS of the current picture that has the same or higher temporal_id as the current picture;
• and
• when the current picture is a temporal switching point and is a temporal sub-layer access (TSA) picture, determine when coded pictures with temporal_id greater than or equal to the temporal_id of the TSA picture that follow the TSA picture in decoding order include any picture in their reference picture set that precedes the TSA picture in decoding order and for which temporal_id is greater than or equal to the temporal_id of the TSA picture.