CN113132766B - VBR (visual basic) sending method of TS (transport stream) packaging format - Google Patents
VBR (visual basic) sending method of TS (transport stream) packaging format Download PDFInfo
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- CN113132766B CN113132766B CN202110285028.4A CN202110285028A CN113132766B CN 113132766 B CN113132766 B CN 113132766B CN 202110285028 A CN202110285028 A CN 202110285028A CN 113132766 B CN113132766 B CN 113132766B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/146—Data rate or code amount at the encoder output
Abstract
The invention discloses a VBR sending method of TS packaging format, comprising the following steps: s10, packaging the audio and video compressed data in a TS format according to the compression code rate; s20, carrying out UDP packaging and sending according to the TS format packaging code rate; s30, when UDP packets are sent, empty packets encapsulated in a TS format are filtered, specifically, TS Header is analyzed according to TS format specifications, and packets with PID of 0x1FFF are directly filtered before UDP transmission, and UDP packets are not sent. The invention can effectively solve the VBR sending problem of the TS packaging format.
Description
Technical Field
The invention belongs to the technical field of real-time audio and video processing, and particularly relates to a VBR (visual basic r) sending method of a TS (transport stream) packaging format.
Background
In an audio/video processing system in the broadcast and television field, audio/video compressed data is generally packaged by a Transport Stream (TS) package format, and a User Datagram Protocol (UDP) network (User Datagram Protocol) to perform transmission of an inter-system real-time Stream. The UDP packet is typically sent with a fixed code rate (Constants Bits Rate, CBR), even if the audio-video coding is a dynamic code rate (Variable Bit Rate, VBR), and finally the highest code rate of the coded dynamic code rate is used as the fixed code rate for sending, which generates unnecessary network traffic.
Because the coding data actually generated per second does not reach the highest code rate generally because the coding data is fixedly transmitted according to the highest code rate of the coding, no data can be transmitted instantaneously in the transmission process of UDP data, and the instantaneous output is disconnected, so that the problem that a rear-end IP switcher mistakenly considers the data source is caused, and the data source is directly switched.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a VBR sending method of TS encapsulation format, which is used for detecting TS encapsulation empty packets in UDP data and filtering, thereby solving the problem of empty packet sending cutoff.
In order to solve the technical problems, the invention adopts the following technical scheme:
a VBR transmitting method of TS package format includes the following steps:
s10, packaging the audio and video compressed data in a TS format according to the compression code rate;
s20, carrying out UDP packaging and sending according to the TS format packaging code rate;
s30, when UDP packets are sent, empty packets encapsulated in a TS format are filtered, specifically, TS Header is analyzed according to TS format specifications, and packets with PID of 0x1FFF are directly filtered before UDP transmission, and UDP packets are not sent.
Preferably, in S10, if the audio/video compressed data is CBR encoded with a fixed code rate, the code rate of the TS format encapsulation is defined as CBR multiplied by the floating coefficient, and is used for reserving table information data in the TS format.
Preferably, in S10, if the audio/video compressed data is CBR encoded with a fixed code rate, the code rate of the TS format encapsulation is defined as the sum of the fixed code rate of the audio compressed data and the fixed code rate of the video compressed data multiplied by the floating coefficient, for reserving table information data in the TS format.
Preferably, if the audio and video compressed data is a dynamic code rate VBR code, the code rate of the TS format encapsulation is defined as the sum of the highest code rate of the audio compressed data VBR and the highest code rate of the video compressed data VBR multiplied by the floating coefficient for reserving table information data in the TS format.
The invention has the following beneficial effects:
(1) Because the TS file packaging code rate has a certain floating up compared with the coding code rate, the problem of TS code rate underflow can be effectively solved;
(2) The UDP sending code rate is controlled, so that the problem of packet loss when the UDP sending instantaneous code rate is too high and a back-end system receives the packet is effectively solved;
(3) And the transmission bandwidth is effectively reduced and the network pressure is obviously reduced by filtering TS file encapsulation empty packet transmission.
Drawings
FIG. 1 is a flowchart illustrating steps of a VBR transmitting method of TS encapsulation format according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a TS package format according to an illustrative embodiment of the present invention;
FIG. 3 is a graph of statistical code rate before modification;
FIG. 4 is a graph of statistical code rate after implementation of the method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flowchart of steps of a VBR transmitting method in a TS package format according to an embodiment of the present invention is shown, which includes the following steps:
s10, packaging the audio and video compressed data in a TS format according to the compression code rate;
s20, carrying out UDP packaging and sending according to the TS format packaging code rate;
s30, when UDP packets are sent, empty packets encapsulated in a TS format are filtered, specifically, TS Header is analyzed according to TS format specifications, and packets with PID of 0x1FFF are directly filtered before UDP transmission, and UDP packets are not sent.
In a specific application example, in S10, if the audio/video compressed data is CBR encoded with a fixed code rate, the code rate of the TS format encapsulation is defined as the sum of the fixed code rate of the audio compressed data and the fixed code rate of the video compressed data multiplied by the floating coefficient, and is used for reserving table information data in the TS format, that is: TS format encapsulation rate= (fixed rate of video compressed data+fixed rate of audio compressed data) ×r, where R > 1.
If the audio/video compressed data is the dynamic code rate VBR code, the code rate of TS format encapsulation is defined as the sum of the highest code rate of the audio compressed data VBR and the highest code rate of the video compressed data VBR multiplied by the floating coefficient, and the floating coefficient is used for reserving the table information data of TS format, and is used for reserving the table information data of TS format, namely: TS format encapsulation code rate= (highest code rate of video compression data dynamic code rate + highest code rate of audio data dynamic code rate) ×r, where R > 1.
Meanwhile, for TS format encapsulation, a standard format is adopted, a transmission packet stream comprises a plurality of encapsulated TS messages, each TS message comprises a message header and a load, and the total size of the TS messages is 188 bytes. The header includes a fixed length portion and an optional portion, the optional portion including an adaptation field. As shown in fig. 2, the fixed part includes 8-bit sync bytes, 1-bit transmission error indication bits, 1-bit transmission priority, 13-bit Packet ID (PID), 2-bit transmission scrambling control, 2-bit adaptation field presence flag, 4-bit continuity counter. For the PID part, the stuffing content of the PID part is different to represent messages with different contents, and the messages are shown in table 1.
Table 1 TS package type
In a specific application example, the specific implementation process of S20 is as follows: setting the data quantity transmitted by UDP in each package, setting the transmission starting time, obtaining the current time, calculating the data quantity required to be transmitted from the transmission starting time to the current time through TS package code rate, and transmitting fixed-length data if the current data quantity required to be transmitted exceeds the transmitted data quantity.
In a specific application example, in S30, as shown in table 1, one type of TS encapsulated packet is a null packet (PID is 0x1 FFF), and the null packet is used for filling the encapsulation code rate of the TS format, and is not generally used for a decoder of the back-end system, so that a packet with the type of null packet is filtered directly before UDP is sent, and a packet with the type of non-null packet is sent out, so that data which is originally sent with a fixed code rate (CBR) is changed into data with a dynamic code rate (VBR) to be sent, and meanwhile, decoding of the back-end system is not affected.
The test statistics are sent by using the VBR with the 55M code rate, the statistical code rate curve before modification is shown in fig. 3, the statistical code rate curve after the implementation of the method in the embodiment of the invention is shown in fig. 4, the statistical code rate of the UDP flow is received from the rear end, the bandwidth occupation of the previous sending code rate is about 50M, the bandwidth occupation is obviously reduced to about 30-40M after modification, the data null condition does not appear, and the effect is obviously improved.
It should be understood that the exemplary embodiments described herein are illustrative and not limiting. Although one or more embodiments of the present invention have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (1)
1. A VBR transmission method of a TS encapsulation format, comprising the steps of:
s10, packaging the audio and video compressed data in a TS format according to the compression code rate; if the audio/video compressed data is CBR encoded with a fixed code rate, the code rate of the TS format encapsulation is defined as the sum of the fixed code rate of the audio compressed data and the fixed code rate of the video compressed data multiplied by the floating coefficient, and is used for reserving table information data in the TS format; if the audio and video compressed data is the dynamic code rate VBR code, the code rate of TS format encapsulation is defined as the sum of the highest code rate of the audio compressed data VBR and the highest code rate of the video compressed data VBR multiplied by the floating coefficient, and the floating coefficient is used for reserving table information data in TS format;
s20, carrying out UDP packaging and sending according to the TS format packaging code rate; setting the data quantity transmitted by UDP in each package, setting the transmission starting time, obtaining the current time, calculating the data quantity required to be transmitted from the transmission starting time to the current time through TS package code rate, and transmitting fixed-length data if the current data quantity required to be transmitted exceeds the transmitted data quantity;
s30, when UDP packets are sent, empty packets encapsulated in a TS format are filtered, specifically, according to TS format specifications, TSHeader is analyzed, packets with PID of 0x1FFF are directly filtered before UDP transmission, and UDP packets are not sent.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101146212A (en) * | 2006-09-11 | 2008-03-19 | 思华科技（上海）有限公司 | Stream media encapsulation and unpacking method and system for video order network |
| CN107113321A (en) * | 2015-01-07 | 2017-08-29 | 三星电子株式会社 | Transmission equipment and receiving device and their signal processing method |
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| CN101959062B (en) * | 2010-05-13 | 2012-07-25 | 北京创毅视讯科技有限公司 | Data transmission method, system and device for mobile multimedia broadcasting system |
| CN103329514B (en) * | 2010-11-23 | 2016-08-31 | Lg电子株式会社 | Broadcast singal sends the broadcast singal receiving/transmission method in equipment, broadcasting signal receiving and broadcast singal transmitting and receiving device |
| CN105657480B (en) * | 2015-12-31 | 2020-07-14 | 惠州市伟乐科技股份有限公司 | Method and device for adjusting TS stream code rate in fractional times |
| TWI692233B (en) * | 2018-12-19 | 2020-04-21 | 財團法人工業技術研究院 | Collaborative transmission method and transmission device based on udp and tcp connections |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101146212A (en) * | 2006-09-11 | 2008-03-19 | 思华科技（上海）有限公司 | Stream media encapsulation and unpacking method and system for video order network |
| CN107113321A (en) * | 2015-01-07 | 2017-08-29 | 三星电子株式会社 | Transmission equipment and receiving device and their signal processing method |
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