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Real-time low-bit rate video transcoding method based on H.264

A video transcoding, low bit rate technology, applied in the field of low bit rate video transcoding based on H.264, can solve the problems affecting the transcoding speed, transcoder limitations, etc. less time effect

Inactive Publication Date: 2011-11-16
郭敏
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  • Claims
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Problems solved by technology

Therefore, the selection of the macroblock prediction mode is one of the most time-consuming parts in the H.264 transcoder based on it. limit

Method used

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  • Real-time low-bit rate video transcoding method based on H.264
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  • Real-time low-bit rate video transcoding method based on H.264

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Embodiment Construction

[0038] In order to facilitate understanding and implementation of the present invention, the present invention will be further described in detail below in conjunction with an example of wireless video-on-demand.

[0039] Such as image 3 , in wireless video on demand, the encoded video streams are stored on the video server, and these video streams are compressed under the premise of high bit rate, that is, the image size is large, the frame rate is high, and the image quality is good. When a wireless terminal user requests a certain video segment, the corresponding required parameters will be sent to the video server at the same time, these parameters include: image size, frame rate, bit rate, etc. The video server starts the transcoding module according to the requirements of these parameters, transcodes the encoded video stream into the required format, and sends the transcoded video stream to the user terminal in real time.

[0040] The transcoding module will use a pre-...

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Abstract

The invention relates to a real-time low-bit rate video transcoding method based on H.264, belonging to the field of multi-media signal processing and mainly solving the problem that the transcoding speed is demanded to be high at low bit rate. Video transcoding in the invention is divided into an off-line modeling stage and an online transcoding stage; a model identification technology is utilized to select a macrolbock prediction model; the macrolbock prediction model selection process is a category decision-making process in model identification; and extracted characteristics are input into a classifier to obtain a classification result, i.e. a macroblock prediction model. The classifier is obtained through offline training. The method not only can remarkably accelerate the transcodingspeed but also ensures the quality of a recoded image to meet the demand of real-time performance. The invention is suitable for the fields of wireless video monitoring, internet video monitoring andwireless video on demand.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, in particular to a real-time H.264-based low-bit-rate video transcoding method, which is mainly used in the fields of wireless video on demand, remote (wireless) video monitoring and the like. Background technique [0002] The application environment of video is very complex, with different transmission channels, storage media, and playback terminals. In these applications, it is often necessary to adjust various parameters such as the image size, frame rate, and image quality in the video stream, so as to meet the requirements of the access network and the playback terminal. such as in figure 1 In the video-on-demand, the video transcoding module can be added to the video server, and the user can complete the video-on-demand through the wireless terminal, thereby solving the problem that the wireless channel is too narrow to be able to order video. In video surveillance, after the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/40H04N19/70
Inventor 郭敏
Owner 郭敏
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