Method for processing a compressed video stream

摘要

For a compressed video stream formed of a sequence of compressed data packets, each compressed packet is assigned to a frame by processing the undecoded data packet. A frame includes packets. A first plurality of frames is assigned to a first sliding window and a second plurality of frames is assigned to a second sliding window. The first and second sliding windows have different frames. A first window indicator is calculated by determining a first indicator representing an average number of packets per frame within the first window, and/or a second indicator representing size information of the data within the first window. A second window indicator is calculated by determining a third indicator representing an average number of packets per frame within the second window, and/or a fourth indicator representing size information of the data within the second window. The first and the second window indicators are compared.

主权项

1. A method for processing a compressed video stream formed of a sequence of compressed data packets, the method comprising:
during a training phase, analyzing a first video stream portion by:
(a) receiving a series of compressed data packets of the first video stream portion;(b) for each received compressed data packet, assigning the compressed data packet to a frame based on data of the compressed data packet, wherein a frame includes one or more compressed data packets;(c) assigning a first plurality of frames to a first sliding window and a second plurality of frames to a second sliding window,(d) periodically calculating a first window indicator by determining
a first indicator representing an average number of compressed data packets per frame within the first sliding window, and/ora second indicator representing size information of data within the first sliding window;(e) periodically calculating a second window indicator by determining
a third indicator representing an average number of compressed data packets per frame within the second sliding window, and/ora fourth indicator representing size information of data within the second sliding window; and(f) periodically calculating a training phase change factor indicating a variation between the first window indicator and the second window indicator; and(g) automatically determining a change threshold factor based on the periodically calculated training phase change factor; during an analysis phase, analyzing a second video stream portion based on the change threshold factor by:
receiving a series of compressed data packets of the second video stream portion,analyzing the compressed data packets of the second video stream portion according to steps (b) through (f) to periodically calculate an analysis phase change factor for the compressed data packets of the second video stream portion,compare the periodically calculated analysis phase change factor to the change threshold factor; andidentifying a video content change in response to the analysis phase change factor exceeding the change threshold factor.