Method and device for detecting available bandwidth based on burstiness of key frame of video stream

A device for detecting an available bandwidth based on a burstiness of a key frame of a video stream, comprising:

• a processor;
• and
• a memory, configured to store instructions executable by the processor,
• wherein the processor is configured to:
• establish a video connection between a sender and a receiver, wherein the video stream is sent by the sender to the receiver;
• record a sending timestamp of each packet at the sender;
• record a receiving timestamp of each packet received by the receiver;
• calculate a difference between the receiving timestamp and the sending timestamp of each packet, and obtain a packet with a smallest difference and a packet with a greatest difference by traversing the packets in the key frame;
• and
• estimate a currently available bandwidth according to the packet with the smallest difference and the packet with the greatest difference,
• wherein estimating the currently available bandwidth according to the packet with the smallest difference and the packet with the greatest difference comprises:
• Avai_bwd
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• where, Avai_bwd is the currently available bandwidth, DataKeyframe is a total size of the key frame, i is the packet with the smallest difference, j is the packet with the greatest difference, recvi and recvj are the receiving timestamps when the receiver receives the packets i and j, and sendi and sendj are the sending timestamps when the sender sends the packets i and j.