A h.264/avc video scheduling method based on double decoding simulation
A scheduling method and video technology, applied in digital video signal modification, electrical components, image communication, etc., can solve multi-delay jitter and delay, difficult to accurately estimate the priority of video packets, estimate or simulate the decoding status of the receiving end, etc. problem, to achieve the effect of ensuring accuracy and rationality, good application value, and ensuring adaptability
Inactive Publication Date: 2016-04-27
XI AN JIAOTONG UNIV
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However, due to many reasons, video transmission in wireless networks always faces many challenges. The reasons are as follows: (1) The instability and time-varying characteristics of the wireless network itself, such as the time-varying transmission rate, there are more delays and jitters and delay etc.
(2) Real-time video data requires high transmission rate and is sensitive to delay
[0004] Although the above solutions have analyzed and solved the above problems from different angles and achieved the goal of improving the video quality to a certain extent, but due to the neglect of the importance of the content of the video package, it is impossible to accurately estimate or Simulation makes it difficult to accurately estimate the priority of each video packet, which leads to an unreasonable scheduling sequence, which in turn affects the substantial improvement of video quality
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[0039] The present invention is described in detail below in conjunction with accompanying drawing and embodiment:
[0040] For example figure 1 The scheduling system shown, the overall scheduling process is as follows:
[0041] 1. Calculate the video packet quality contribution index PQCI frame by frame for each H.264 / AVC video stream. The definition of the index is as follows:
[0042] P Q C I ( m ) = D l ( m ) - D r ( m ) b i t ( m )
[0043] Among them, PQCI(m) is the PQCI o...
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The invention discloses an H.264 / AVC (Any Video Converter) video scheduling method based on double decoding simulation. The method comprises the following steps of (1) calculating the packet quality contribution index (PQCI) of each H.264 / AVC video packet to be transmitted, wherein PQCI is obtained by calculating two kinds of distortion, and each kind of distortion comprises two parts: the quality contribution of the video packet to a current frame and the quality contribution of the video packet to a subsequent frame; (2) during the calculation of the own quality contribution of each video packet, bringing two decoders into a transmitting end for performing distortion estimation by adopting a method based on double decoding simulation, and solving quality contribution; (3) during the calculation of the quality contribution of each video packet to the subsequent frame, solving by adopting a diffusion factor weighting method; and (4) sequencing and scheduling video packets to be transmitted according to the magnitudes of PQCIs, and transmitting the video packets. Due to the adoption of the H.264 / AVC video scheduling method, the quality of videos decoded at a receiving end is improved, the performance of video transmission in a wireless network is improved, and user experience of the receiving end is improved finally.
Description
technical field [0001] The invention belongs to an H.264 / AVC video scheduling scheme in a wireless network, and relates to a priority scheduling method for H.264 / AVC video transmission in a wireless network, in particular to an H.264 / AVC video based on double decoding simulation priority scheduling method. Background technique [0002] With the popularization and development of wireless transmission technology, the use of wireless network for data transmission to realize information interaction has become a hot research topic at present. Among them, using mobile phones and other wireless terminals as multimedia experience devices such as video and audio has become a growing application trend and has a good application prospect. However, due to many reasons, video transmission in wireless networks always faces many challenges. The reasons are as follows: (1) The instability and time-varying characteristics of the wireless network itself, such as the time-varying transmission...
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IPC IPC(8): H04N19/89
Inventor 李凡张丹阳张虹王明慧李娜
Owner XI AN JIAOTONG UNIV