Video coding rate control method and video coding rate control 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.

Active Publication Date: 2015-06-17
CHINA TELECOM CORP LTD
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Problems solved by technology

[0003] In order to adapt to the HTTP dynamic adaptive streaming transmission mechanism, the time length of stream slices with different bit rates is fixed, and the size of stream slices with the same bit rate is fixed. Since the current MBR technology uses a bit rate based on CBR (constant bit 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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  • Video coding rate control method and video coding rate control system
  • Video coding rate control method and video coding rate control system
  • Video coding rate control method and video coding rate control 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 Authorize...

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Abstract

The invention discloses a video coding rate control method and a video coding rate control system. The method comprises the steps of calculating a distributable bit T*R obtained by a corresponding segment according to the time length T of the segment and the average code rate R of code stream, respectively calculating coded I, B and P frames to obtain the rate R(Qi) of the frames or macro blocks, calculating inter-frame distortion according to the rate R(Qi), obtaining a quantization parameter Q<*> corresponding to the minimum inter-frame distortion of a whole video sequence, and determining a distributed GOP bit according to the quantization parameter. The dynamic nature of video screen content within the time length of a segment is fully reflected, and the quality of video coding is improved.

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. It provides a variety of different bitrate streams 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 HTTP dynamic adaptive streaming transmission mechanism, the time length of stream slices with different bit rates is fixed, and the size of stream slices with the same bit rate is fixed. Since the current MBR technology uses a bit rate based on CBR ...

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Application Information

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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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