公开(公告)号：US12278970B2

公开(公告)日：2025-04-15

申请号：US17942592

申请日：2022-09-12

Applicant: Axis AB

Inventor： Mattias Pettersson ,  Björn Völcker ,  Malte Johansson

IPC: H04N19/15 ,  H04N19/107 ,  H04N19/136 ,  H04N19/177 ,  H04N19/184 ,  H04N19/423

Abstract: A computer implemented method for controlling a transmission of a video stream is provided. The method comprises estimating a number of bits for a group of pictures, GOP, of the video stream to be transmitted, setting a latency requirement for the transmission of the video stream, determining an average minimum video bitrate across the GOP based on the estimated number of bits and a time corresponding to a time period represented by a duration of the GOP, for video frames in the GOP setting an output bitrate for transmission of a video frame based on the latency requirement and the average minimum video bitrate, and transmitting the video frame using the output bitrate.

公开(公告)号：US12149634B2

公开(公告)日：2024-11-19

申请号：US18084905

申请日：2022-12-20

Applicant: Axis AB

Inventor： Björn Völcker ,  Stefan Lundberg

IPC: H04L9/32 ,  H04L9/06

Abstract: A signed media bitstream comprises data units and signature units. Each signature unit is associated with one or more nearby data units and include at least one fingerprint derived from the associated data units and a digital signature of the at least one fingerprint. A storing method comprises: receiving a segment of the media bitstream; identifying N≥2 instances of a repeating data unit in the received segment; pruning up to N−1 of the identified instances of the repeating data unit; and storing the received segment after pruning. A validation method comprises: receiving a segment of the media bitstream stored in accordance with the storing method; and validating a signature unit using a digital signature contained therein. Despite the pruning of the repeating data unit, the received associated data units can be successfully validated, either directly or indirectly, by means of different embodiments herein.