CN104581420A - Transmission system for 4G wireless videos on rail traffic vehicle - Google Patents
Transmission system for 4G wireless videos on rail traffic vehicle Download PDFInfo
- Publication number
- CN104581420A CN104581420A CN201410845642.1A CN201410845642A CN104581420A CN 104581420 A CN104581420 A CN 104581420A CN 201410845642 A CN201410845642 A CN 201410845642A CN 104581420 A CN104581420 A CN 104581420A
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- Prior art keywords
- field
- sequence
- transmission system
- rail vehicle
- video
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Classifications
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
-
- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
Abstract
The invention discloses a transmission system for 4G wireless videos on a rail traffic vehicle. A special transmission protocol audio and video synchronization algorithm is adopted, transmission protocols are mainly connected through orders of a 4G public network module with other networks, video data of high quality can be transmitted, 4G (TD-LTE) serves as the core technology, the characteristics of high speed, large broadband, rail traffic and the like are integrated, and a new generation 4G vehicle wireless playing system is formed. The audio and video synchronization compression algorithm is mainly used for carrying out synchronization on each frame of video and each frame of audio according to timestamps, wherein the timestamps are the numerical values of audio and video frames relative to the time of the system when audio and video frames are played.
Description
Technical field
The invention belongs to wireless video transmission technology, what be specifically related to is a kind of transmission system of 4G wireless video on rail vehicle.
Background technology
There is following problem in the wireless video transmission of existing rail vehicle, 1, wireless signal in train, have a lot of interference source, such as mobile phone signal; 2, the bandwidth ratio of transmission of wireless signals is lower cannot meet high-quality transfer of data; 3, the packet loss of wireless signal frequency range is higher, causes a lot of data re-transmission waste bandwidths and affects communication quality.
Summary of the invention
The object of the invention is to the above problem overcoming prior art existence, a kind of transmission system of 4G wireless video on rail vehicle is provided, docked by order and other network of 4G public network module, the video data of high quality.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A transmission system for 4G wireless video on rail vehicle,
Each Frame carries out burst according to sequence number;
I in certain timestamp of each burst corresponding data frame, P, B frame data;
By ID, receiving terminal is the I of the inside, and P, B frame in order algorithm rearranges, and judges whether to retransmit according to the importance of frame to the data of packet loss, then plays after the time of being undertaken by timestamp plays sequence.
Further, the package head format of the data of described packet loss comprises custom field and TCP procotol, described custom field comprises PT field, sequence number field, timestamp field, SSRC field, extension ID, extension length, S, sequence A high part, sequence A low part, sequence B high part, sequence B low part and RTP payload field.
Further, H.264 described PT field comprises, AAC and MPA, and H.264 described be the decimal system 70, and represent Video coding code stream, described AAC is the decimal system 100, and represent stream of audio codes, described MPA is the decimal system 14, represents stream of audio codes.
Further, described sequence number field is necessary for and increases progressively in turn from any number, can find packet loss by this field.
Further, described timestamp field contains relative media time between current media bag and a upper media bag, and client must arrange suitable media play time according to this media timestamp.
Further, described SSRC field contains the unique identification of current server, constant all the time in a session.
Further, described extension ID, extension length, S, sequence A high part, sequence A low part, sequence B high part, sequence B low part field adopts SCCP connection-oriented to be connected with towards nothing, and described SCCP connection-oriented adopts TCP to connect, use as reserved field, currently must ignore these fields; Described towards being that UDP connects without connecting, it is good that TCP is used for applicable network situation, and when broadcast request is high, it is poor that UDP is used for applicable network situation, the situation that broadcast request is not high.
Further, described RTP payload field contains the whole or a part of code stream of video.
The invention has the beneficial effects as follows:
1, transmission rate is fast, and under normal circumstances, transmission rate can reach 12.5MB/s;
2, signal frame loss rate controls in ten thousand/left and right.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the Single NAL package mode figure of RTP;
Fig. 2 is the FU-A NAL package mode figure of RTP;
Fig. 3 is the format chart of FU indicator;
Fig. 4 is the format chart of FU header;
Fig. 5 is workflow diagram of the present invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
A transmission system for 4G wireless video on rail vehicle,
Each Frame carries out burst according to sequence number;
I in certain timestamp of each burst corresponding data frame, P, B frame data;
By ID, receiving terminal is the I of the inside, P, B frame in order algorithm rearranges, judge whether to retransmit according to the importance of frame to the data of packet loss, then play after the time of being undertaken by timestamp plays sequence, network retransmission can be reduced and improve synchronous precision.
Further, the package head format of the data of described packet loss comprises custom field and TCP procotol, described custom field comprises PT field, sequence number field, timestamp field, SSRC field, extension ID, extension length, S, sequence A high part, sequence A low part, sequence B high part, sequence B low part and RTP payload field.
With reference to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, it is further that system employs SingleNal and FU-A two kinds of modes, H.264 described PT field comprises, AAC and MPA, H.264, described is the decimal system 70, represent Video coding code stream, described AAC is the decimal system 100, represents stream of audio codes, described MPA is the decimal system 14, represents stream of audio codes.Data flow observes RFC3984 about RTP package form H.264.
Further, described sequence number field is necessary for and increases progressively in turn from any number, can find packet loss by this field.
Further, described timestamp field contains relative media time between current media bag and a upper media bag, and client must arrange suitable media play time according to this media timestamp.
Further, described SSRC field contains the unique identification of current server, constant all the time in a session.
Further, described extension ID, extension length, S, sequence A high part, sequence A low part, sequence B high part, sequence B low part field adopts SCCP connection-oriented to be connected with towards nothing, and described SCCP connection-oriented adopts TCP to connect, use as reserved field, currently must ignore these fields; Described towards being that UDP connects without connecting, it is good that TCP is used for applicable network situation, and when broadcast request is high, it is poor that UDP is used for applicable network situation, the situation that broadcast request is not high.
Further, described RTP payload field contains the whole or a part of code stream of video.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the transmission system of 4G wireless video on rail vehicle, is characterized in that:
Each Frame carries out burst according to sequence number;
I in certain timestamp of each burst corresponding data frame, P, B frame data;
By ID, receiving terminal is the I of the inside, and P, B frame in order algorithm rearranges, and judges whether to retransmit according to the importance of frame to the data of packet loss, then plays after the time of being undertaken by timestamp plays sequence.
2. the transmission system of 4G wireless video on rail vehicle according to claim 1, it is characterized in that: the package head format of the data of described packet loss comprises custom field and TCP procotol, described custom field comprises PT field, sequence number field, timestamp field, SSRC field, extension ID, extension length, S, sequence A high part, sequence A low part, sequence B high part, sequence B low part and RTP payload field.
3. the transmission system of 4G wireless video on rail vehicle according to claim 2, it is characterized in that: H.264 described PT field comprises, AAC and MPA, H.264, described is the decimal system 70, represent Video coding code stream, described AAC is the decimal system 100, represent stream of audio codes, described MPA is the decimal system 14, represents stream of audio codes.
4. the transmission system of 4G wireless video on rail vehicle according to claim 2, is characterized in that: described sequence number field is necessary for and increases progressively in turn from any number, can find packet loss by this field.
5. the transmission system of 4G wireless video on rail vehicle according to claim 2, it is characterized in that: described timestamp field contains relative media time between current media bag and a upper media bag, and client must arrange suitable media play time according to this media timestamp.
6. the transmission system of 4G wireless video on rail vehicle according to claim 2, is characterized in that: described SSRC field contains the unique identification of current server, constant all the time in a session.
7. the transmission system of 4G wireless video on rail vehicle according to claim 2, it is characterized in that: described extension ID, extension length, S, sequence A high part, sequence A low part, sequence B high part, sequence B low part field adopts SCCP connection-oriented to be connected with towards nothing, and described SCCP connection-oriented adopts TCP to connect, use as reserved field, currently must ignore these fields; Described towards being that UDP connects without connecting, it is good that TCP is used for applicable network situation, and when broadcast request is high, it is poor that UDP is used for applicable network situation, the situation that broadcast request is not high.
8. the transmission system of 4G wireless video on rail vehicle according to claim 2, is characterized in that: described RTP payload field contains the whole or a part of code stream of video.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410845642.1A CN104581420A (en) | 2014-12-31 | 2014-12-31 | Transmission system for 4G wireless videos on rail traffic vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410845642.1A CN104581420A (en) | 2014-12-31 | 2014-12-31 | Transmission system for 4G wireless videos on rail traffic vehicle |
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| CN104581420A true CN104581420A (en) | 2015-04-29 |
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| CN201410845642.1A Pending CN104581420A (en) | 2014-12-31 | 2014-12-31 | Transmission system for 4G wireless videos on rail traffic vehicle |
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| CN102006476A (en) * | 2010-11-19 | 2011-04-06 | 厦门雅迅网络股份有限公司 | Optimal processing method for transmitting and receiving real-time video data |
| CN102013962A (en) * | 2009-09-04 | 2011-04-13 | 华为技术有限公司 | Data transmission method and equipment |
| CN102088640A (en) * | 2011-01-10 | 2011-06-08 | 西安电子科技大学 | Adaptive selection retransmission method based on video content |
| CN102104468A (en) * | 2011-02-18 | 2011-06-22 | 中兴通讯股份有限公司 | Routing agent-based media sensing automatic retransmission request (ARQ) control method and system |
| CN103716507A (en) * | 2013-12-31 | 2014-04-09 | 阿纳克斯（苏州）轨道系统有限公司 | Vehicle-ground wireless media video transmission system |
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2014
- 2014-12-31 CN CN201410845642.1A patent/CN104581420A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20100091801A1 (en) * | 2006-09-06 | 2010-04-15 | Kyoto University | Data communication system, data transmitting device, data transmitting method, data receiving device, and data receiving method |
| CN102013962A (en) * | 2009-09-04 | 2011-04-13 | 华为技术有限公司 | Data transmission method and equipment |
| CN102006476A (en) * | 2010-11-19 | 2011-04-06 | 厦门雅迅网络股份有限公司 | Optimal processing method for transmitting and receiving real-time video data |
| CN102088640A (en) * | 2011-01-10 | 2011-06-08 | 西安电子科技大学 | Adaptive selection retransmission method based on video content |
| CN102104468A (en) * | 2011-02-18 | 2011-06-22 | 中兴通讯股份有限公司 | Routing agent-based media sensing automatic retransmission request (ARQ) control method and system |
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Application publication date: 20150429 |