A video coding rate control method and system

A bit rate control and video coding technology, which is applied in the field of image processing, can solve the problem that the length of slice time cannot fully reflect the dynamics of video images, etc., achieve the effect of high picture clarity and coherence, and improve the quality of video coding

Active Publication Date: 2018-04-06
CHINA TELECOM CORP LTD
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Problems solved by technology

[0003] In order to adapt to the dynamic adaptive streaming mechanism of HTTP, the time length of stream slices of different code rates is fixed, and the size of stream slices of the same code rate is fixed. Since the current MBR technology uses a code rate based on CBR (constant code rate) The control method, which pre-encodes to generate a variety of code streams with different bit rates, cannot fully reflect the dynamics of video images in combination with the slice time length

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  • A video coding rate control method and system
  • A video coding rate control method and system
  • A video coding rate control method and system

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[0077] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0078] At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0079] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0080] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authoriz...

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Abstract

The invention discloses a method and a system for controlling video encoding rate. The method includes: according to the slice time length T and the average code rate R of the code stream, calculate the allocatable bits T×R obtained by the corresponding slice; respectively calculate the coded I, B and P frames to obtain the frame or macroblock rate R(Qi); Calculate the interframe distortion according to the rate R(Qi), and obtain the quantization level parameter corresponding to the minimum interframe distortion of the entire video sequence, and determine the allocated GOP bits according to the quantization level parameter. The invention fully embodies the dynamics of the video picture content within the slice time length, and improves the video coding quality.

Description

technical field [0001] The invention belongs to the field of image processing, and in particular relates to a method and system for controlling video coding rate. Background technique [0002] At present, the OTT video system uses the HTTP dynamic adaptive streaming protocol to implement the flow control mechanism at the application layer, and provides a variety of code streams with different bitrates through MBR (Multiple Bitrate) technology, and slices them to adapt to different users and network conditions. Customers The end automatically selects slices of different bit rates for download, realizing smooth switching of videos of different quality levels, and improving the user's video playback experience. [0003] In order to adapt to the dynamic adaptive streaming mechanism of HTTP, the time length of stream slices of different code rates is fixed, and the size of stream slices of the same code rate is fixed. Since the current MBR technology uses a code rate based on CBR...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/134H04N19/124H04N19/154
Inventor 罗传飞赵学军杨征蒋力
Owner CHINA TELECOM CORP LTD
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