CN109451293A - A kind of adaptive three-dimensional video transmission method of open base station computing capability - Google Patents
A kind of adaptive three-dimensional video transmission method of open base station computing capability Download PDFInfo
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- CN109451293A CN109451293A CN201810903751.2A CN201810903751A CN109451293A CN 109451293 A CN109451293 A CN 109451293A CN 201810903751 A CN201810903751 A CN 201810903751A CN 109451293 A CN109451293 A CN 109451293A
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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
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/114—Adapting the group of pictures [GOP] structure, e.g. number of B-frames between two anchor frames
-
- 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
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
-
- 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
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234309—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 or from Quicktime to Realvideo
-
- 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
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
The invention proposes a kind of adaptive three-dimensional Video transmission system and schemes.The present invention elaborates a kind of transmission plan of three-dimensional video-frequency from two angles of coding and decoding video and streaming media.Streaming media server completes coding, slice and the deployment of original video source, supports a variety of stereo scopic video coding schemes.User is according to capacity of equipment and the specified desired video segment stream of Network status change request.Base station carries out polymerization analysis to the service request of accessing user, and existing three-dimensional video-frequency slice, the requirement then specified according to user generate corresponding video segment and push on streaming media server request server.Three-dimensional video-frequency slice is converted to the particular video frequency slice stream of compatible subscribers equipment, matching network ability using the computing capability of base station, self adaptation stream can be realized according to the code rate of network change dynamic adjustment video segment stream.Present invention reduces the storage of server and flow pressure, the requirement to user terminal computing capability is reduced, there is good compatibility, the code rate Adaptive Transmission of a variety of three-dimensional video-frequencies may be implemented.
Description
1. application field
The present invention relates to the adaptive streaming transmission problems of three-dimensional video-frequency.
2. background technique
It is existing with the fast development and mutually fusion of computer vision, computer graphics and video processing technique
The demand that conventional planar video, i.e. two-dimensional video business are no longer satisfied people can provide the three of stereoscopic vision for people
The multi-view point video (Multi-view Video, MVV) of (3 Dimensions, 3D) video, multi-angle observation is tieed up by more
The concern of people.
In order to avoid obscuring between term, multi-view point video herein refer to using be located at different points of view multiple video cameras from
One group of vision signal group that the same scenery of different perspectives sync pulse jamming obtains, each viewpoint shooting is binocular video；3D view
Frequently refer to the binocular video of some viewpoint, that is, include one group of vision signal group of two-pass video, binary channels respectively corresponds human eye
Right and left eyes.Three-dimensional video-frequency is then the general designation to 3D video and multi-view point video, and solid can be presented in conjunction with specific display technology
Display effect.The Streaming Media scheme of three-dimensional video-frequency not only needs to consider the design of transport protocol and scheme, it is contemplated that video
The compression storage mode and stereoscopic display mode in source.Herein we will be illustrated from two angles of Video coding and streaming media
Case.
The compression storage mode of video source depends primarily on video coding and decoding technology, and corresponding corresponding storage format.Ginseng
Examine mainstream encoding and decoding standard H.264/AVC with next-generation encoding and decoding standard H.265/HEVC and two generation standards are about three-dimensional video-frequency
It is proposed H.264/MVC, MVV-HEVC and 3D-HEVC extension, three-dimensional video-frequency is mainly the following storage format:
A) traditional binocular video is made of two-way planar video, respectively corresponds left and right per vision signal absolute coding all the way
Eye；
B) conventional video+depth map is made of conventional planar video and depth map, utilizes camera record depth of view information etc.
Mode generates depth map, and then introduces new coding techniques and improve compression efficiency.
C) multi-view point video is made of multichannel binocular video, the binocular video of a corresponding viewpoint per video all the way, therefore
Include multichannel conventional planar video and depth map.Multiple view video coding introduces the technologies such as parallax prediction, utilizes redundancy between viewpoint
Improve compression efficiency.
Binocular video and conventional video+depth map can indicate the steric information of scene, the former is more direct, two-way view
Frequency directly corresponds to right and left eyes；The latter is then indirect representation method, needs that binocular video could be formed by conversion.Multiple views view
Frequency include multichannel binocular video, therefore stereoscopic multi-view stereoscopic display can be provided, binocular solid is shown and conventional two-dimensional is shown,
Data volume is also bigger.
Stereoscopic display is the vision mechanism according to human eye, retina image-forming process is simulated, by two width of left and right of Same Scene
Image projects on the left and right eyes retina of people, can be obtained stereoscopic vision impression.Therefore it needs to guarantee using appropriate device left
Corresponding view is respectively seen without being overlapped in right eye.Stereoscopic Video Presentation technology is broadly divided into eyeglass stereoscopic and shows (such as
The stereoscopic display of polarised light glasses formula) and naked eye type stereoscopic display (such as parallax barrier naked eye type stereoscopic display).
Consider from transmission of angle, three-dimensional video-frequency remote ultra-traditional planar video in data volume, transferring content is from single channel monocular
Video becomes one or more binocular video, and the demand of bandwidth resources is very big.The scheme of traditional binocular video, data volume are tradition
Twice of planar video；Conventional video+depth scheme requires terminal operational capability high.The scheme designed herein be
Video code conversion is completed in base station, therefore transferring content is still traditional binocular video, and data volume is still twice of conventional planar video.
Multi-view point video data volume is bigger, and the bearing capacity by existing network is far from being enough.
3. summary of the invention and feature
The present invention relates to the adaptive streaming transmission problems of three-dimensional video-frequency.
It is related to streaming media server, base station and user's (client) in the present invention.Streaming media server provides stereopsis
Frequency source, these three-dimensional video-frequencies include traditional binocular video, conventional video+depth map and multi-view point video；Base station refers to one
The mobile communication base station for determining computing capability is accessing network by mobile user " the last leg ".User passes through base station access network network,
Three-dimensional video-frequency is requested to streaming media server, video resource is obtained by way of stream transmission.
Specific step is as follows:
A) video frequency source coding.Video source server carries out compressed encoding to original three-dimensional video-frequency, and Video coding requires to make
With GOP (Group of Picture, picture group) structure of closing and fixed length, each GOP can be decoded independently.For traditional double
Visually frequency generates two groups of video flowings of left and right viewpoint；For conventional video+depth map, conventional video stream and depth map data are generated
It flows, each frame corresponds to each frame of video in depth map；For multi-view point video, viewpoint number is N, then generates 2N group video flowing.
B) video source is sliced.Video source server is sliced video flowing according to fixed duration t, and each slice includes phase
With the GOP of number.Customized video information description text is generated according to the data format negotiated with user client in treatment process
Part.Video presentation information after the slice that this document includes, including filename, broadcasting total duration, video compression format (HEVC,
AVC, VP9, VP8 etc.), audio compression format (AAC, MP3 etc.), packaged type (MPEG- 2, MPEG-4 etc.), resolution ratio, frame
Rate is sliced duration, is sliced serial number, URI, coding mode (traditional binocular video, conventional video+depth map, multi-view point video etc.).
Furthermore according to the difference of Video coding mode, traditional binocular video is needed comprising channel position (corresponding right and left eyes) etc.；Tradition view
Frequently+depth map needs the information description (such as picture compression format, corresponding GOP serial number and video frame number) comprising depth map
It needs Deng, multi-view point video comprising viewpoint serial number and channel position etc..
C) request video information describes file.User is literary to streaming media server request video information description by base station
Part knows demandable video resource information.Base station also gets the video information disposed in streaming media server simultaneously.
D) video segment file is requested.User asks according to sendings such as capacity of equipment, the variation of Network status, viewpoint variations
It asks, which includes the requirement that user can receive video segment, the video for needing designated to be sliced in the request, audio pressure
Contracting format, packaged type, resolution ratio, frame per second, slice duration, serial number, code rate etc..For the three-dimensional video-frequency of any coding mode,
Two groups of video flowings are requested respectively, and then decoding rendering plays respectively.
E) user group requirement analysis and video code conversion.The request of accessing user is carried out parsing classification by base station, is requested same
The user of video source constitutes a user group.Base station to streaming media server request video segment, then according to user request into
Row transcoding and plug-flow.For traditional binocular video, need to require to carry out according to user transcoding, generation meets the specified requirement of user
The slice of (video, audio compression format, packaged type, resolution ratio are sliced duration, serial number, code rate), the video for being sliced code rate are cut
Then piece pushes；For conventional video+depth map, needs to complete the work that 2D turns 3D, utilize 2D planar video and corresponding depth
Degree figure renders traditional binocular video segment, then generates the specified desired video segment push of user；For multi-view point video,
Need to analyze the view information of user group request, then to one group or multiple groups video of streaming media server request certain view
Then slice completes 2D and turns 3D and code rate conversion, the specified desired video segment of push user.
Three-dimensional video-frequency source is many kinds of, only does simple slicing treatment to original video in the transmission plan of this patent design,
Complexity is low, and storage pressure is small.User equipment is multifarious, cuts in the transmission plan of this patent design to the received video of user
Piece format is unified, and the slice of traditional binocular video is designed as, and can directly utilize conventional video decoder decoding rendering.
Most of three-dimensional video-frequencies (conventional video+depth map, multi-view point video) are very high for the requirement of terminal computing capability, and this patent will turn
Code process is transferred to base station side, to reduce the requirement to user equipment, maintains good compatibility.For multi-user's feelings
For scape, the content height of the user group viewing in same cell is similar, and the demand to user group carries out confluence analysis, alleviates
The flow pressure of streaming media server, while reducing the calculation amount of base station side.For single user scene, each user point
The radio resource moment variation being fitted on, originally in the transmission plan of ad hoc meter, user can show according to terminal unit ability and network
The code rate of the adaptive adjustment request video segment such as situation, maximally utilizes Internet resources, while guaranteeing smooth broadcasting experience.
Detailed description of the invention
(1) Fig. 1 is schematic diagram of a scenario of the invention.
(2) Fig. 2 is the flow diagram of the method for the present invention.
(3) Fig. 3 is a kind of schematic diagram of embodiment.
4. specific implementation method is illustrated
An implementation example is given below in implementation method in order to further illustrate the present invention.This example is only indicated to this
The schematic illustration of invention does not represent any restrictions of the invention.
Assuming that a HTTP streaming media server will dispose one section containing 6 viewpoints, the multiple views of Shi Changwei 800s are regarded
Frequently " Sport ", format YUV420.Four users A, B, C, D have been accessed in base station, and wherein user A, B can play video most
Big resolution ratio is 3840x2160, and the maximum resolution that user C, D can play video is 7680x4320, and user ABCD can be with
The maximum frame per second for playing video is 60fps, supports all audiovisual compressions and encapsulation format.User A's, B, C, D is average available
Bandwidth is respectively 15Mbps, 20Mbps, 30Mbps, 40Mbps.According to the present invention, specific practice will is that
A) original video coded slice.After completing coding, video compression format HEVC, audio compression format AAC, envelope
Dress format is MPEG-4, and resolution ratio 7680x4320, frame per second 60fps, GOP length is 30, and the first frame of each GOP is IDR
Frame, compressed video code rate are 50Mbps.Original video contains 6 viewpoints, therefore encodes and compressed obtain 6 groups of videos texts
Part, viewpoint serial number 01~06.After completing slice, when slice a length of 2s, be sliced serial number 1-400, totally 6 groups.These files are retouched
Information is stated to be stored in description file " MVV_Sport.xml " according to xml grammer.
B) first assume that user ABCD changes video via same base station requests.User ABCD sends HTTP GET request and gets
Video information describes file " MVV_Sport.xml ", and furthermore base station also gets the xml document.
C) user ABCD sends HTTP POST request and successively requests slice serial number 1-400 to HTTP streaming media server
Slice.It is 3840x2160, code rate 15Mbps, viewpoint serial number 01 that user A, which requires the resolution ratio of video,；User B requires view
The resolution ratio of frequency is 3840x2160, code rate 20Mbps, viewpoint serial number 02；User C require video resolution ratio be
7680x4320, code rate 30Mbps, viewpoint serial number 02；It is 7680x4320 that user D, which requires the resolution ratio of video, and code rate is
40Mbps, viewpoint serial number 02.
Furthermore user ABCD is consistent to other requirements of video segment, does not list one by one herein.These information are written to
In the Body of POST request.
D) base station carries out parsing and polymerization analysis after receiving these HTTP POST requests, learns user ABCD request
Content is same video source, and video segment to be obtained derives from the slice group of the video viewpoint serial number 01 and 02.Therefore will
The video segment that serial number 1-400 is sliced in viewpoint serial number 01 and 02 two group is successively requested to HTTP streaming media server.
E) base station carries out transcoding operation to video according to the requirement in HTTP POST request Body to video.Viewpoint serial number
To include conventional video slice and depth map slice in 01 slice, 3D is turned by 2D, these slices are transcoded into binocular video and cut
Piece.Generating resolution ratio by the control of down-sampled and code rate according to the requirement of user A is 3840x2160, and code rate is cutting for 15Mbps
Piece；It is 3840x2160 that the requirement for thoroughly doing away with user B, which generates resolution ratio by the control of down-sampled and code rate, and code rate is cutting for 20Mbps
Piece.The subsequent operation that the slice of viewpoint serial number 02 needs is same as above.Slice after completing transcoding is pushed to corresponding user respectively
?.
F) step c) is repeated d) and e) until the slice of slice serial number 1-400 is all pushed to user or user cancels
Business.In above process, the available bandwidth of user may send variation at any time, therefore in the HTTP POST request of user just
New code rate requirement is had, base station needs to generate the video segment of meet demand according to each request of user, realizes adaptive
The transmission of code rate.
Claims (4)
1. a kind of adaptive three-dimensional Video transmission system and scheme.The compatible existing streaming media server of this programme and terminal video
Decoder participates in three-dimensional video-frequency transmission services by the computing capability of open base station, reduces the storage and flow pressure of server
Power reduces the requirement to user terminal computing capability, realizes the adaptive streaming transmission of a variety of three-dimensional video-frequencies.Of the invention
It is characterized in that following steps:
A) server and user need to reach an agreement on media information describing mode before business is initiated, and description file is written and sends out in business
It is obtained simultaneously before rising by user and base station.User for being sliced file needed for requesting, base station for polymerization analysis user request and
Forward user's request.
B) encoding operation that server disposition video source is related to only is made that limitation to gop structure, other coding parameters are not by shadow
It rings.Sectioning is simple and does not influence the video content after coding.The copy of server disposition original video, without superfluous
It is remaining.
C) the received video segment of client is the slice of conventional video, and compatible existing Video Decoder is not required to except decoding
Want additional calculating.
D) base station participates in business, and plays the part of pivotal player.Base station requests to sort out to user to be merged, and is reduced and is obtained video to server
The operation of slice stream reduces server traffic pressure.Three-dimensional video-frequency slice is converted to traditional binocular video segment by base station, is guaranteed
To the compatibility of user equipment.Base station generates the video segment for meeting its demand according to user demand, realizes Adaptive Transmission.
2. the method according to claim 1, wherein the streaming media server, which refers to, arbitrarily may be implemented stream matchmaker
The transport protocol of the server of body business, realization includes but is not limited to HTTP, RTP/RTSP.The base station refers to any with meter
Calculation ability provides the radio station of mobile communication access function.
3. the method according to claim 1, wherein the three-dimensional video-frequency includes but is not limited to binocular tri-dimensional
Frequently, monocular/binocular tri-dimensional video containing depth map, containing/be free of depth map multi-view point video.
4. the method according to claim 1, wherein described adaptively includes but is not limited to video compress lattice
The dynamic self-adapting variation of formula, audio compression format, the adaptive adjustment of encapsulation format and resolution ratio, frame per second, code rate.
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| CN201810903751.2A CN109451293B (en) | 2018-08-09 | 2018-08-09 | Self-adaptive stereoscopic video transmission system and method |
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Cited By (3)
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| CN110062130A (en) * | 2019-03-14 | 2019-07-26 | 叠境数字科技（上海）有限公司 | Gigabit grade pixel video rendering method and device based on preprocessed file structure |
| CN110446051A (en) * | 2019-08-30 | 2019-11-12 | 郑州航空工业管理学院 | Three-dimensional video-frequency code stream Adaptable System and method based on 3D-HEVC |
| CN113115077A (en) * | 2021-03-12 | 2021-07-13 | 上海交通大学 | Code rate self-adaptive transmission method and system for static point cloud server |
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