Patent ID: 11943274
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. Method for recovering a video stream from a bitstream which comprises sub-picture portions for different portions of a video picture area, the method comprising:
identifying a predetermined subpicture portion out of the subpicture portions of the bitstream on the basis of signaling inbound from outside or signaling in the sub picture portions,
decrypting a coding payload section of the predetermined subpicture portion of the subpicture portions of the bitstream by finding a border of the coding payload section of the predetermined subpicture portion to be decrypted by

parsing the coding payload section up to a currently decrypted position, and/or
deriving a length of the coding payload section from a header within the predetermined subpicture portion, and/or
using a bitstream length or pointer indication signaled from outside for the predetermined subpicture portion.