Method for transmitting video-frequency flow in network

A technology of network transmission and video streaming, applied in digital video signal modification, electrical components, image communication, etc., can solve the problems of large switching frames, poor adaptability of network bandwidth conversion, and unavailability, so as to improve utilization rate and ensure scalability Sex and interactivity, the effect of the best visual experience

Inactive Publication Date: 2006-10-18
ZTE CORP
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Problems solved by technology

[0007] Each of the above methods has its own disadvantages: Scalable video requires the decoder to support multi-layer decoding
The disadvantage of this method is that the use of switching frames leads to a serious degradation of image quality, especially in the case of cellular networks, frequent switching will cause serious degradation of the image quality of the reconstructed video until it is unavailable
In order to solve this problem, Farber and Girod pointed out that a small quantization level can be used to encode switching frames, but this will result in very large switching frames and consume a lot of network resources, which is not advisable on narrowband networks
On t

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  • Method for transmitting video-frequency flow in network

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Embodiment Construction

[0020] The present invention can be used to solve the scalability problem of the video stream, and can realize the switching of multiple coded video streams of the same video source independent of each other at any moment, instead of having to switch to the key frame of the target stream. The mixed stream obtained in this way is seen as a single independent code stream at the decoding end. For example, the same video source encodes two video streams with different bit rates using the baseline profile of the H.264 standard. Mixed streams with a code rate between 32Kbps and 48Kbps. It should be pointed out that the H.264 standard baseline profile is used for coding the switching frame at this time, but the coding method for the switching frame can be completely different from the coding method of the video stream, such as wavelet transform, K-L transform and so on. If the pixel size of the reference image of the inter-coded frame in the video stream is reduced during motion est...

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Abstract

A method for transmitting video stream in network includes providing a video source section in mode of compressed video stream with at least two different code rates as each video stream being included with at least one video frame coded by interframe coding mode and with at least one frame identified to be type of enabling to be discarded, coding one switch-over frame for each pair video stream, switching network to low code rate video stream when network band width is changed from high to low and switching it to high code rate video stream when network band width is changed from low to high.

Description

technical field [0001] The invention belongs to the field of data communication and relates to the fields of scalable video compression and streaming media transmission. Background technique [0002] A video is composed of a series of continuous still images, which are displayed on the screen at high speed to give people the feeling of moving objects in a movie, and each image is called a frame. Video compression is a collection of algorithms used to compress video so that it satisfies the bit-count (ie, bandwidth) constraints determined by the transmission medium. For example, a communication cable in a local area network can transmit video at a fixed rate of 8Mbps (megabits per second), but the transmission rate will drop significantly in a cellular network. [0003] Multimedia codec usually consists of two parts: encoder and decoder. The encoder compresses the original data to a certain size for transmission. Generally speaking, the larger the compression ratio, the wo...

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Application Information

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IPC IPC(8): H04N19/132H04N19/146H04N19/503
Inventor 鲁照华
Owner ZTE CORP
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