Video buffering operations for random access in video coding

A device for processing video data comprising:

• a processor configured to:
• receive in a video bitstream an access unit having a first random access point (RAP) picture;
• receive in the video bitstream, after the access unit in the bitstream, a subsequent access unit having a second RAP picture;
• and
• in a case that one or more random access skipped leading (RASL) pictures for the subsequent access unit are not present in the received video bitstream, shift a picture buffer removal time for a picture buffer earlier based on a picture buffer removal delay offset.

A device for processing video data comprising:

• a processor configured to:
• receiving an access unit after an earlier initialization of a hypothetical reference decoder (HRD), the access unit having a random access point (RAP) picture, wherein associated access units containing random access skipped leading (RASL) pictures are not received;
• and
• re-initializing the HRD, including re-initializing a picture buffer removal time and a picture buffer removal delay offset, in response to receiving the access unit and not receiving the associated access units containing RASL pictures.

A device for processing video data comprising:

• means for receiving in a video bitstream an access unit having a first random access point (RAP) picture;
• means for receiving in the video bitstream, after the access unit in the bitstream, a subsequent access unit having a second RAP picture;
• and
• means for shifting a picture buffer removal time for a picture buffer earlier based on a picture buffer removal delay offset in a case that one or more random access skipped leading (RASL) pictures for the subsequent access unit are not present in the received video bitstream.

A non-transitory computer readable storage medium storing instructions that upon execution by one or more processors cause the one or more processors to:

• receive in a bitstream an access unit having a first random access point (RAP) picture;
• receive in the video bitstream, after the access unit in the bitstream, a subsequent access unit having a second RAP picture;
• and
• shift a picture buffer removal time for a picture buffer earlier based on a picture buffer removal delay offset in a case that one or more random access skipped leading (RASL) pictures for the subsequent access unit are not present in the received video bitstream.

A method of processing video data comprising:

• signaling a CPB removal delay offset for each CRA or BLA access unit;
• shifting the CBP removal time of each of the access units following the CRA or BLA access unit in decoding order is earlier by the CPB removal delay offset for each CRA or BLA access unit for which the associated RASL pictures are not present;
• and
• regardless of whether the HRD initializes at the CRA or BLA access unit.