Dynamic flow control method of streaming media server for ensuring audio/video quality

Abstract

The invention provides a dynamic flow control method of a streaming media server for ensuring audio / video quality, which comprises the following steps of: (1), dividing a sending stream document into a group of slices and establishing index information for the slices before the sending stream document is played; (2), figuring out an average code rate according to the index information, and recording or setting a group boundary, wherein all frames in a frame group are sent with reference to the average code rate; (3), sending a transport stream packet, and recording to the length of the maximum packet, and obtaining the time interval of the maximum packet by dividing the length of the maximum packet by the average code rate; (4) initially playing one packet, determining a relative time forthe next packet to be sent according to the time interval of the maximum packet, calculating an absolute time point for the next packet to be sent, and judging whether the current time exceeds the relative time; (5), reaching the end of a frame to complete the sending of one packet; and (6) recalculating the average code rate and entering the next circulation when a played frame reaches the groupboundary. When the method is adopted, the problem of packet loss can be solved, the impact on a router can be reduced, the play speed and play effect can be ensured, and the play quality can be improved.

Description

technical field [0001] The invention relates to a streaming media system and a step-by-step video-on-demand system, in particular to a dynamic flow control method for a streaming media server to ensure audio and video quality. Background technique [0002] The streaming media system is a system with very high real-time requirements. At present, there are more and more streaming media encoding formats, and the bit rate changes more and more. Good flow control must be able to adapt to these changes. Due to the different types of streaming media frames, the size of the frame varies greatly, but the frame interval of the playback is basically the same. Refer to the PTS (Play Time Stamp, display time stamp) for streaming. If the flow control is not good, it will cause the streaming media server to stream. The code rate is very unstable. When there is a large amount of concurrency, the network traffic jitter is quite large, which has an impact on the switch or router, and it is ea...

AI Technical Summary

Problems solved by technology

Due to the different types of streaming media frames, the size of the frame varies greatly, but the frame interval of the playback is basically the same. Refer to the PTS (Play Time Stamp, display time stamp) for streaming. If the flow control is not good, it will cause the streaming media server to stream. The code rate is very unstable. When there is a large amount of concurrency, the network traffic jitter is quite large, which has an impact on the switch or router, and it is easy to cause packet loss in the intermediate router, which directly affects the decoding quality of the terminal and reduces the playback effect.

Some packet loss control technologies currently used, such as RTCP (RTP Control Protocol, RTP control protocol) to control packet loss retransmission, FEC (Forward Error Correction, forward error correction), etc., can solve packet loss to a certain extent, but these The technology is based on the smooth streaming of the streaming media system, and this type of technology requires additional overhead, such as bandwidth and computing power of the server, the cooperation of the client and the server, etc., which cannot save costs

Even if the media stream is played at a constant bit rate, there are corresponding problems, because many media have variable bit rates. If the bit rate is fixed, the part with a small bit rate will be played too fast, and the part with a high bit rate will be played too quickly. The problem of slowness still affects the quality