Method for statistics of multiplex transmission stream

A technology of statistical multiplexing and transport stream, applied in the field of statistical multiplexing transport stream, which can solve the problem that statistical multiplexing and encoder re-encoding cannot be well completed.

Active Publication Date: 2007-01-31
SHANGHAI GMT DIGITAL TECH
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Problems solved by technology

[0004] At present, there are statistical multiplexers developed and produced by some well-known companies on the market. Most of these multiplexers are implemented by hardware, and in the process of statistical multiplexing, there is a process of communication with the encoder, that is, within a period of time, Check the number of bits of the code stream of the input multi-channel program. If it exceeds a certain range, the encoder is required to re-encode the program during this period until it meets the requirements. This implementation method is suitable for the situation where encoding and multiplexing are realized at the sam...

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  • Method for statistics of multiplex transmission stream

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Embodiment approach

[0133] Such as figure 1 Shown, utilize a kind of method for statistics multiplexing transport stream provided by the present invention, the video elementary stream (code rate 1.5M~2.0M) of input 10 road AVS formats and the audio stream of 10 road MPEG formats are multiplexed into A transport stream whose transmission rate is always equal to Trans_rate (for example, Trans_rate=20Mbps);

[0134] Step 1. Initialize the module;

[0135] Step 1.1, analyze the video stream of the input AVS and the sequence header in MPEG-2, obtain the frame rate Frame_rate=25 frames / second of the video stream;

[0136] Step 1.2, apply for some memory used internally when doing statistical multiplexing;

[0137] Step 1.3, according to the input SAL_frame_No=5, ps->pict_duration=1000ms / 25 frames=40ms, get how many transport stream packets output the transport stream should have during this period of time: nPacket_salframe=(TS_BITRATE / (188*1000*8 / ps->pict_duration))*SAL_frame_no=(20000000 / (188*1000...

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Abstract

A statistical method for the multiple transport flow includes initialization, statistics of input information and multiple transport streams etc. The invention provides a simple and efficient method completely without encoder, which is used for the multi-channel statistics of basic document flow of video and audio.

Description

technical field [0001] The invention relates to a method for statistically multiplexing transmission streams. Background technique [0002] Digital audio and video codec standards that have been maturely applied now, such as MPEG-2, and a number of representative international standards that have emerged in recent years, such as MPEG-4, H.264 / MPEG-4 AVC (a standard established by ITU-T The international standard for video compression coding jointly formulated with ISO / IEC MPEG), the standard AVS independently formulated by my country, etc., some of these standards are called the system part, this part mainly discusses how to combine single or multi-channel basic audio and video Streams and other data are combined into single and multiplexed streams suitable for storage and transmission. A transport stream is a data stream defined in part of the system, which combines one or more programs with one or more different clock bases into a single stream, and its rate can be constant...

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Application Information

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IPC IPC(8): H04N7/52H04L29/00
Inventor 李萍李国平陈勇
Owner SHANGHAI GMT DIGITAL TECH
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