Bit rate control method in video transmission process

Abstract

The invention relates to a video transmission rate adaptation method applied to wireless networks. The video transmission rate adaptation method includes preliminarily arranging an output cache area at an output end of a buffer area; storing data packets outputted from the buffer area in the output cache area and acquiring the total amount of the stored data packets in current unit time thresholds; adjusting the speeds for reading data of the buffer area if the total amount of the data packets stored within the current unit time thresholds is unequal to the total amount of data packets storedwithin a previous unit time threshold and fluctuates within the range of 10% of the total amount of the data packets stored within the previous unit time threshold; adjusting the strength of encodersfor processing I frames of images in a next time frame if the total amount of the data packets stored within the current unit time thresholds does not fluctuate within the range of 10% of the total amount of the data packets stored within the previous unit time threshold but fluctuates within the range of 35% of the total amount of the data packets stored in the previous unit time threshold. Unittime thresholds for storing the corresponding data packets are preset in the output cache area.

Description

technical field [0001] The invention relates to the field of video playback, in particular to a code rate control method in the video transmission process. Background technique [0002] As the requirements for video playback are getting higher and higher, traditional streaming media systems use the method of buffering frames to overcome the instability caused by channel changes and other reasons. The buffering of frames uses a certain delay in exchange for video fluency. When the signal condition deteriorates and the buffer underflows, the media playback will be paused, and the playback will continue after buffering. However, this method is likely to cause interruption of video playback, and it is difficult to ensure the real-time performance of video transmission, which affects the user's viewing experience. [0003] In view of the above problems, the patent document 201310006416.X discloses a bit rate smoothing method for real-time video transmission under wireless network...

AI Technical Summary

Problems solved by technology

In the actual operation of this method, the size of the buffer area is adjusted by adjusting the 25% variation range of the playback speed. However, the 25% variation of the playback speed leads to a large abnormal state of the picture and sound, which affects the user experience.

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