CN1972446A - A video stream transmission method for mobile multimedia broadcasting system - Google Patents
A video stream transmission method for mobile multimedia broadcasting system Download PDFInfo
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- CN1972446A CN1972446A CN 200610157168 CN200610157168A CN1972446A CN 1972446 A CN1972446 A CN 1972446A CN 200610157168 CN200610157168 CN 200610157168 CN 200610157168 A CN200610157168 A CN 200610157168A CN 1972446 A CN1972446 A CN 1972446A
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Abstract
This invention relates to mobile multi-media broadcasting system audio flow send method, which comprises the following steps: a, coding the audio frequency flow to be sent each with only one code; b, cutting each flow into multiple audio units and sealing unit into audio section and recording each audio unit length, codes, times into audio section head; c, sealing audio section and other transmission data into one business channel; d, after receiving audio section, playing audio section flow.
Description
Technical field
The invention belongs to Mobile Multimedia Broadcasting or technical field of mobile TV, specially refer to a kind of or transfer approach of multiple video strems realizing mobile broadcasting channel in multimedia.
Background technology
Mobile Multimedia Broadcasting is a kind of Play Technique for Multimedia of rising in recent years.By hand-held terminal, under the situation of high-speed mobile, can watch TV.Terminal receives programme by wireless protocols, and can select the channel of oneself having the right to watch, thereby can accept to select the multi-medium data of channel, is implemented in and sees TV on the portable terminal.
The aerial data of broadcast system emission are divided into different channels, transmit respectively by multiplex technique, and terminal can receive relevant data, by the player on the terminal, realize the normal play of TV.
For same channel, system can send 1 road video, also can send multi-channel video signal.
The method of existing one or more video of realization mainly contains 2 kinds:
First kind is TS (transport stream) mode.The TS agreement is a kind of in MPEG (Motion Picture Experts Group) standard, it is placed on video, audio frequency and control information in the bag of fixing 188 byte-sized and transmits, distinguish different video flowings by PID (program code) field, thereby can support the broadcast of multiple video strems.But each bag of TS mode is very little, and efficient is lower.
Second kind is ISMA (internet stream media alliance) mode.The ISMA standard is with RTP (RTP) transfer medium information, can open a plurality of RTP passages, transmit different video flowings, but this mode only is adapted at using on the IP network.
Summary of the invention
The objective of the invention is at above-mentioned problems of the prior art, a kind of method that can realize one or more video flowings in mobile multimedia broadcast system is provided, make a plurality of video flowings in mobile multimedia broadcast system, to transmit, and improve the transmission efficiency of video flowing in the mobile multimedia broadcast system.
Concrete performing step of the present invention is as follows:
A kind of video stream transmission method of mobile multimedia broadcast system comprises the steps:
(1) will need the unified numbering of the video flowing that transmits, each video flowing has unique number;
(2) each video flowing is divided into a plurality of video units, and video unit is encapsulated in the video-frequency band, with the length of each video unit, video flowing numbering, reproduction time is recorded in the video paragraph header relatively;
(3) video-frequency band and other data encapsulation that need transmit are transmitted in a service channel;
(4) after terminal receives video-frequency band, take out each video flowing, carry out the broadcast of video flowing according to length, the video flowing numbering of each video unit in the video paragraph header.
Wherein, further write down the frame type information of each video unit in the described video paragraph header.
Wherein, described video paragraph header also comprises check code.
Wherein, described method further comprises: between each video unit in a video data, use synchronous head to do isolation.
Wherein, the data in the described service channel comprise that also subframe is first-class, and described subframe head comprises the length of video-frequency band and the parameter of video-frequency band.
The present invention is encapsulated in a plurality of video flowings in the channel by each video flowing is divided into a plurality of video units, transmits a plurality of video flowings with a plurality of video units, has realized can transmitting a plurality of video flowings in the same video-frequency band.The invention belongs to the method for 1 one or more video of channel of a kind of realization that is adapted at using in the radio network, be particluarly suitable for using in the mobile broadcast network.
Description of drawings
Fig. 1 is the schematic diagram that video flowing is divided into a plurality of video units in the video-frequency band of a channel.
Fig. 2 contains 2 schematic diagrames that are divided into the video flowing of a plurality of video units in the video-frequency band.
Embodiment
Below in conjunction with accompanying drawing the present invention is done detailed description.
The composition form of the multimedia service data that transmits in 1 channel can be various, for example, as shown in Figure 1, the embodiment of the invention provides a kind of form, and wherein the multimedia service data that transmits in 1 channel can be made up of subframe head, video-frequency band, audio section, data segment.
Wherein, the subframe head is mainly control information, specifically comprises: length information, video parameter, audio frequency parameter, initial reproduction time, check code etc.Check code is used for verifying the reliability of subframe header.
Subject matter to be solved by this invention is exactly how one or more video flowings to be encapsulated in the channel.Composition form with the business datum in 1 channel shown in Figure 1 is an example, that is to say that the video-frequency band that how to make wherein carries one or more video flowings.
Therefore, according to embodiments of the invention, at first can be with each video flowing unification numbering of needs transmission, each video flowing is gathered around with unique numbering, each video flowing is divided into a plurality of video units respectively, each video unit all has the numbering of video flowing separately, does isolation with synchronous head between each video unit, to reach wrong function of isolating.
Video unit after choosing several respectively cut apart from above-mentioned plurality of video stream forms a video-frequency band, and wherein each video unit length, video flowing numbering, relative reproduction time is recorded in the video paragraph header of this video-frequency band.
Wherein, the length of video unit can be used for the location and cut apart each video unit data, relatively reproduction time and initial reproduction time and be the time of actual play, it is to be used for identifying this video unit to belong to which video flowing that video flowing is numbered.
Because the extensibility of video-frequency band header, therefore the length of the video unit that comprises of above-mentioned video-frequency band is variable.
Also can write down the frame type information of each video unit in the video paragraph header, it is key frame, forward direction associated frame or two-way associated frame that the frame type of video unit is used for identifying this video unit.
With video-frequency band and other data encapsulation that need transmit in a service channel.
By said method, just realized in a channel, comprising a plurality of video flowings, so just can transmit by aerial with the form of wireless multi-media broadcast signal.After terminal receives video-frequency band, take out each video flowing, carry out the broadcast of video flowing according to length, the video flowing numbering of each video unit in the video paragraph header.
Be example with 2 video flowings below, specify realization details of the present invention.As shown in Figure 2, suppose to have 2 video flowings in a channel, to transmit, and suppose that first video flowing is split into 15 video units, the 2nd video flowing is split into 10 video units, after choosing and be combined into a video-frequency band sequentially, this video-frequency band has comprised this two video flowings, specifically, the 1st video flowing comprises: 1,3,5,7,9,11,13,15,17,19,21,22,23,24,25, the 2 video flowings of video unit comprise: video unit 2,4,6,8,10,12,14,16,18,20.Like this, just this video-frequency band and subframe head, audio section, data segment can be encapsulated in the channel and transmit.Although the specific implementation method of these 2 video flowings that Fig. 2 provides is to choose intersecting in the video unit of two video flowings, in fact the present invention is not limited to any order.
Because the descriptor to each video unit is arranged in the video paragraph header, the video flowing numbering that comprises video unit, can clearly identify every video unit and belong to which video flowing, therefore the video unit of these 2 video flowings can not exclusively be arranged according to the order among Fig. 2, be that order among Fig. 2 is adjustable, as, can also be arranged in 1,3,2,4,5,7,6,8,9,11,10,12,13,15,14,16,17,19,18,20,21,22,23,24,25, or being arranged in other order, ordering can not have certain rule.
More than be the implementation procedure of two video flowings of transmission in the channel,, can realize that 1 video flowing, 2 video flowings or the video flowing more than 2 transmit simultaneously in a channel according to same principle.
In the experiment of carrying out according to embodiments of the invention, establishing business datum has 256Kbit/s speed.
This channel comprises: subframe head length 122 bytes, video-frequency band head length 127 bytes, video segment length 26.5K byte, wherein the bandwidth of first video flowing is the 20.5K byte, and the bandwidth of the 2nd video flowing stream is the 6K byte, audio section head length 129 bytes, audio frequency segment length 4K byte, data segment length 1K byte for the part of not enough 32K byte, can fill complete 0.
Such television channel can satisfy the transmission of the video-frequency band of the H264 of 1 QVGA resolution, 25 frames or AVS-M, with the transmission of the video-frequency band of the H264 of a QCIF, 12 frames or AVS-M, can provide the mobile broadcast television program of suitable satisfactory quality two video streaming to the user.
Claims (5)
1, a kind of video stream transmission method of mobile multimedia broadcast system comprises the steps:
(1) will need the unified numbering of the video flowing that transmits, each video flowing has unique number;
(2) each video flowing is divided into a plurality of video units, and video unit is encapsulated in the video-frequency band, with the length of each video unit, video flowing numbering, reproduction time is recorded in the video paragraph header relatively;
(3) video-frequency band and other data encapsulation that need transmit are transmitted in a service channel;
(4) after terminal receives video-frequency band, take out each video flowing, carry out the broadcast of video flowing according to length, the video flowing numbering of each video unit in the video paragraph header.
2, the video stream transmission method of mobile multimedia broadcast system as claimed in claim 1 is characterized in that, further writes down the frame type information of each video unit in the described video paragraph header.
3, the video stream transmission method of mobile multimedia broadcast system according to claim 1 is characterized in that, described video paragraph header also comprises check code.
4, the video stream transmission method of mobile multimedia broadcast system as claimed in claim 1 is characterized in that, further comprises: between each video unit in a video data, use synchronous head to do isolation.
5, the video stream transmission method of mobile multimedia broadcast system as claimed in claim 1 is characterized in that, the data in the described service channel comprise that also subframe is first-class, and described subframe head comprises the length of video-frequency band and the parameter of video-frequency band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610157168 CN1972446A (en) | 2006-11-30 | 2006-11-30 | A video stream transmission method for mobile multimedia broadcasting system |
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| CN 200610157168 CN1972446A (en) | 2006-11-30 | 2006-11-30 | A video stream transmission method for mobile multimedia broadcasting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780916A (en) * | 2012-04-12 | 2012-11-14 | 天脉聚源(北京)传媒科技有限公司 | Method for aggregating and distributing live video streams |
| CN106550266A (en) * | 2015-09-21 | 2017-03-29 | 中国移动通信集团公司 | A kind of video broadcasting method and video acquisition synthesizer |
| CN113727184A (en) * | 2020-05-25 | 2021-11-30 | 京东城市(北京)数字科技有限公司 | Video playing method, device, system, storage medium and electronic equipment |
-
2006
- 2006-11-30 CN CN 200610157168 patent/CN1972446A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780916A (en) * | 2012-04-12 | 2012-11-14 | 天脉聚源(北京)传媒科技有限公司 | Method for aggregating and distributing live video streams |
| CN102780916B (en) * | 2012-04-12 | 2015-03-18 | 天脉聚源(北京)传媒科技有限公司 | Method for aggregating and distributing live video streams |
| CN106550266A (en) * | 2015-09-21 | 2017-03-29 | 中国移动通信集团公司 | A kind of video broadcasting method and video acquisition synthesizer |
| CN113727184A (en) * | 2020-05-25 | 2021-11-30 | 京东城市(北京)数字科技有限公司 | Video playing method, device, system, storage medium and electronic equipment |
| CN113727184B (en) * | 2020-05-25 | 2023-11-03 | 京东城市(北京)数字科技有限公司 | Video playing method, device, system, storage medium and electronic equipment |
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Application publication date: 20070530 |