CN101833935B - Multi-machine video synchronous playing method based on display card refresh rate - Google Patents
Multi-machine video synchronous playing method based on display card refresh rate Download PDFInfo
- Publication number
- CN101833935B CN101833935B CN201010170754.3A CN201010170754A CN101833935B CN 101833935 B CN101833935 B CN 101833935B CN 201010170754 A CN201010170754 A CN 201010170754A CN 101833935 B CN101833935 B CN 101833935B
- Authority
- CN
- China
- Prior art keywords
- video
- main control
- control computer
- node machine
- machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 8
- 239000000284 extract Substances 0.000 claims abstract description 4
- 230000006870 function Effects 0.000 claims description 7
- 238000011017 operating method Methods 0.000 claims description 3
- 238000009331 sowing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 230000004044 response Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 description 11
- 238000012937 correction Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention relates to a multi-machine video synchronous playing method based on a display card refresh rate, and belongs to the technical field of digital multimedia playing. In order to improve the stability and synchronization effect of the frame rate in the process of playing the multi-machine video, the method provided by the invention comprises the following steps: a display card presetting step: the main control machine and the node machine set the refreshing frequency of the display card according to the frame rate required by playing and start the vertical synchronization function of the display card at the same time; the synchronous playing and frame rate control of the node machine comprises the following steps: and the node machine extracts video data from the film source data buffer area and carries out multi-machine synchronous playing and frame rate control through a preset display card refresh rate. The technical scheme of the invention greatly reduces the problem of multi-machine synchronization caused by network communication abnormity and network response abnormity, does not increase any hardware cost, controls multi-machine synchronization and frame rate by utilizing the refresh rate of the display card, and realizes stable playing frame rate and optimal synchronization effect.
Description
Technical field
The invention belongs to digital multimedia play-back technology field, be specifically related to a kind of method for synchronously playing multi-computer video based on refresh rate of display card.
Background technology
Along with the digital camera Play System is more and more higher to the requirement of sharpness, the resolution of output picture is considerably beyond the computing machine output resolution ratio of a display device in other words, therefore often need multiple devices to splice the complete picture of a ultrahigh resolution together, how to guarantee all devices output picture just become a key issue synchronously.
Traditional method mainly contains two kinds:
1, coordinates by network or other communication modes, guarantee that all machines draw same frame picture at synchronization.Concrete grammar is: have a table scale to make the machine of master control in the system, notify other all machines to generate a certain frame picture by network, after generating, do not export earlier by all machines, but notice master control, master control knows that all machines all are ready to the order that new picture sends an output later on again, all are drawn and export picture when machine is received this order together, thereby realize synchronously.
The defective of this method is to need to rely on machine communication before, if by network communication, then each frame has twice network service at least: master control-＞node, node-＞master control, the instability of network, the losing, delay time of packet, the response time of networking command, processing time all can impact synchronous broadcast, thereby cause frame speed unstable, movie is not smooth, the effect of card occurs.If can increase the cost of hardware again by the communication apparatus of other high-performance high stability.
2, the timer by every equipment self triggers drafting: at first have one through the timer of calibration on every machine, all machines can be received an initiation command before beginning to play, order will be informed from which and be begun constantly to play, because the clock of all machines is through calibration, therefore everybody can begin to play first frame at synchronization, afterwards according to the new picture of clock each output one frame of self timer, as long as the timer clock is consistent, just can keep synchronous always.
The defective of this method has 2 points: the one, for all machines are installed timer accurately, like this with regard to needs and outer dedicated hardware, increase cost, and extra hardware can cause and outer burden also to computing machine, for example the power of power supply etc.The 2nd, for playing digital film on computers, the output picture all will pass through video card, and the output of video card is directly related with refresh rate of display card, even timer can be very accurate, still will wait for the refresh cycle of video card.
Summary of the invention
(1) technical matters that will solve
Technical matters to be solved by this invention is under the situation that does not increase any hardware cost, by software, improves the stable and synchronous effect of frame speed in the multi-computer video playing process.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of method for synchronously playing multi-computer video based on refresh rate of display card, described method is finished the synchronous broadcast of multi-computer video by audio/video player system, described audio/video player system comprises: main control computer, the playing process that is used for divided video and controls video; The node machine, video playback is carried out in the instruction that is used for the reception main control computer; Be provided with video card in main control computer and the node machine, described video card is used for driving and regulate the control display according to video to be played;
Described player method comprises:
Video card pre-sets step: main control computer and node machine are opened video card vertical synchronization function simultaneously according to the refreshing frequency of the frame speed setting video card of broadcast request;
The node machine is play and frame speed control step processed synchronously: after the node machine receives the play instruction of main control computer, extract video data and carry out multimachine broadcast and frame speed control system synchronously by the refresh rate of display card that pre-sets from the film source data buffer.
Video card pre-sets between step and the broadcast synchronously of node machine and the frame speed control step processed and comprises:
The main control computer film source is cut out and the video parameter forwarding step: main control computer, is cut out film source with respect to the display offset position of main control computer and the viewing area size of node machine according to the node machine, and the video playback parameter after will cutting out sends to the node machine respectively;
Step is set up in node machine film source data buffer: the video parameter dynamic creation film source data buffer that node machine basis receives, and read the film source sequence frame in advance to internal memory; Running through complete back notice main control computer broadcast preliminary work in advance finishes;
Main control computer play instruction forwarding step: after main control computer is received the ready message of whole node machines, notify all node machines to begin video playback.
Described main control computer film source is cut out and the video parameter forwarding step comprises main control computer video parameter setting step: after main control computer is cut out film source, and the path of specified sequence frame and frame speed, and configure the film source play parameter; Main control computer sends to the node machine with the path of sequence frame and frame speed and film source play parameter afterwards.
Described film source play parameter comprises sheet source path, frame speed parameter and audio files path.
Described node machine is play synchronously and frame speed control step processed also comprises afterwards:
Asynchronous communication model operating procedure: the broadcast of main control computer by asynchronous communication model control node machine, suspend, stop and switching film source and operate;
Node machine video playback ending step: the node machine is notified main control computer after video playback finishes;
Main control computer video playback ending step: main control computer receives after all node machine sowings put the message that finishes, and notice node machine stops to play the shape body, switches to other mode of operations;
Program withdraws from step: the node machine withdraws from playing program after receiving ceasing and desisting order of main control computer, and the node machine discharges the data buffer of creating simultaneously.
(3) beneficial effect
Technical solution of the present invention relies on refresh rate of display card to realize multimachine synchronization video playing function fully, in the interference that reduces network as far as possible with do not increase on the basis of extra hardware cost, guarantees the most stable frame speed and the synchronous effect of the best.
Compared with prior art, reduced the multimachine stationary problem that network service is unusual and the network response abnormality causes in the technical scheme that the present invention proposes greatly, and do not increase any extra hardware cost, utilize the synchronous and frame speed of refresh rate control multimachine of video card itself, in conjunction with custom-designed data Caching Mechanism, multithreading decompress(ion) broadcast mode, stable broadcast frame speed and best synchronous effect have been realized.
Description of drawings
The main flow chart of the technical scheme that Fig. 1 provides for the embodiment of the invention.
Embodiment
For making purpose of the present invention, content and advantage clearer, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
Embodiment
Present embodiment specifically describes a kind of method for synchronously playing multi-computer video based on refresh rate of display card that technical solution of the present invention provides, described method is finished the synchronous broadcast of multi-computer video by audio/video player system, described audio/video player system comprises: main control computer, the playing process that is used for divided video and controls video; The node machine, video playback is carried out in the instruction that is used for the reception main control computer; Be provided with video card in main control computer and the node machine, described video card is used for driving and regulate the control display according to video to be played;
Fig. 1 is the main flow chart of present embodiment technical scheme.As shown in Figure 1, the method for synchronously playing multi-computer video of present embodiment proposition comprises the following steps:
(1) video card pre-sets step: the frame speed that main control computer and node machine design according to broadcast request is set the refreshing frequency of video card, opens video card vertical synchronization function simultaneously;
(2) the main control computer film source is cut out step: main control computer, is cut out film source with respect to the display offset position of main control computer and the viewing area size of node machine according to the node machine;
(3) the main control computer video parameter is set and forwarding step: the path of main control computer specified sequence frame and frame speed, and configure the film source play parameter, comprise the sheet source path, frame speed parameter, audio files path; Main control computer sends to the node machine with the path of sequence frame and frame speed and film source play parameter;
(4) node machine decompress(ion) buffer area and texture cache district set up step: the setting of node machine and initialization decompressed data buffer size and texture compiling buffer size, and fill up buffer area;
(5) step is set up in node machine film source data buffer: the video parameter dynamic creation film source data buffer that node machine basis receives, and read the film source sequence frame in advance to internal memory, the sheet source data is put in the data buffer preserves; Running through complete back notice main control computer broadcast preliminary work in advance finishes;
(6) main control computer play instruction forwarding step: main control computer receives that the ready message of all node machines falls behind, and notifies all node machines to begin video playback;
(7) the node machine is play and frame speed control step processed synchronously: the node machine extracts video data and carries out multimachine by the refresh rate of display card that pre-sets and play synchronously and frame speed control system from the film source data buffer;
(8) node chance error difference feedback step: when a certain node machine went wrong, feedback error information was to main control computer; The node machine is opened network communication operations simultaneously, proceeds the decompress(ion) of video film source and draws operation from decompress(ion) buffer area and texture cache district;
(9) main control computer error error correction step: the information that main control computer recipient node machine need be corrected starts mechanism for correcting errors, carries out the synchronous correction operation, determines synchronous frame number, sends error correction data to the node machine;
(10) node chance error difference aligning step: the node machine carries out error correction according to the main control computer error correction data, and network communication operations is finished in normal back;
(11) asynchronous communication model operating procedure: the broadcast of main control computer by asynchronous communication model control node machine, suspend, stop, switching operation such as film source;
(12) node machine video playback ending step: the node machine is notified main control computer after video playback finishes;
(13) main control computer video playback ending step: main control computer receives after all node machine sowings put the message that finishes, and notice node machine stops to play the shape body, switches to other mode of operations;
(14) program withdraws from step: the node machine withdraws from playing program after receiving ceasing and desisting order of main control computer, and the node machine discharges data buffer, decompression buffer and the texture buffer of creating simultaneously.
The core concept of present embodiment technical scheme is opened video card vertical synchronization function exactly, utilizes the intrinsic refresh rate of video card as clock, carries out multimachine synchronously and sheet frame speed is broadcast in control.For the digital sand table system, the digital film that we play generally is per second 30 frames or per second 25 frames.For the film of 30 frames, we are set as 60Hz to refresh rate of display card, draw the broadcasting speed that a frame picture just just in time can guarantee 30 frames every once refreshing like this.For the film of 25 frames, can be set as 75Hz to refresh rate of display card, it is just out of question to refresh drafting one frame picture every twice like this.
Our test of process is safe enough with the refresh rate of video card as clock, though there are two hidden danger, but can not impact: hidden danger one: the vertical synchronizing signal of video card can be subjected to the influence of vertical resolution, the more high software of vertical resolution waits for that at every turn the time of vertical synchronizing signal is more long, but because the resolution of all machine outputs of a general digital sand table system all is the same, therefore can not impact.Hidden danger two: accurately all node machines of control figure sand table system begin to play simultaneously, and TCP/IP network service can reach requirement fully.
Certainly the vertical synchronization that only relies on video card still is not enough, time-delay occurred just in case video card is drawn, and has missed once to refresh and just may cause a machine than the situation of the slow frame of other machines.We have also increased mechanism for correcting errors to consider this problem, and the probability that allows this situation occur drops to minimum.At first be to create core buffer, with the sequence frame data pre-head in core buffer, broadcast the sheet process like this and just only relate to decompress(ion) and drafting, decompress(ion) and drafting are tied on the different CPU by multithreading again calculates, independent CPU nuclear of each decoding thread binding, and the decoding line number of passes is configurable, we have also designed decompress(ion) data buffer and data texturing buffer zone, if transient delay or the instantaneous problem of texture compiling appearance appear in system's decompress(ion) like this, data in the buffer zone will guarantee that frame speed is stable, and after system is normal, because the compilation speed of decompress(ion) speed and texture is faster than display speed, so buffer zone can be filled up very soon, buffered data can correctly be used when guaranteeing to occur next time instantaneous problem; Secondly we have designed mechanism for correcting errors, whether node machine itself can be identified self to draw and go wrong, if problem, then notify main control computer to do a synchronous correction, the network communication mechanism of open and close in real time that to correct principle be exactly specialized designs, be just to open network communicating function and carry out synchronous correction going wrong only; Our controls such as replaying/suspend/stop/cutting into slices of using asynchronous mechanism to guarantee to broadcast in the sheet process at last.
The present embodiment technical scheme relies on refresh rate of display card to realize multimachine synchronization video playing function fully, and designed the data caching mechanism, mechanism for correcting errors, network communication mechanism, in the interference that reduces network as far as possible with do not increase on the basis of extra hardware cost, guarantee the most stable frame speed and best synchronous effect.
Compared with prior art, reduced the multimachine stationary problem that network service is unusual and the network response abnormality causes in the technical scheme that the present invention proposes greatly, and do not increase any extra hardware cost, utilize the synchronous and frame speed of refresh rate control multimachine of video card itself, in conjunction with custom-designed data Caching Mechanism, multithreading decompress(ion) mode, dynamic correction mechanism, stable broadcast frame speed and best synchronous effect have been realized.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (3)
1. method for synchronously playing multi-computer video based on refresh rate of display card, described method is finished the synchronous broadcast of multi-computer video by audio/video player system, and described audio/video player system comprises: main control computer is used for the playing process of divided video and control video; The node machine, video playback is carried out in the instruction that is used for the reception main control computer; Be provided with video card in main control computer and the node machine, described video card is used for driving and regulate the control display according to video to be played; It is characterized in that described player method comprises:
Video card pre-sets step: main control computer and node machine are opened video card vertical synchronization function simultaneously according to the refreshing frequency of the frame speed setting video card of broadcast request;
The main control computer film source is cut out step: main control computer, is cut out film source with respect to the display offset position of main control computer and the viewing area size of node machine according to the node machine;
The main control computer video parameter is set and forwarding step: the path of main control computer specified sequence frame and frame speed, and configure the film source play parameter; Main control computer sends to the node machine with the path of sequence frame and frame speed and film source play parameter;
Node machine decompress(ion) buffer area and texture cache district set up step: the setting of node machine and initialization decompressed data buffer size and texture compiling buffer size, and fill up buffer area;
Step is set up in node machine film source data buffer: the video parameter dynamic creation film source data buffer that node machine basis receives, and read the film source sequence frame in advance to internal memory, described film source sequence frame is put in the described film source data buffer preserves; Run through in advance and finish back notice main control computer and play preliminary work and finish, described video parameter is made up of the path of described sequence frame and frame speed and film source play parameter;
Main control computer play instruction forwarding step: after main control computer is received the ready message of all node machines, notify all node machines to begin video playback;
The node machine is play and frame speed control step processed synchronously: after the node machine receives the play instruction of main control computer, extract video data and carry out multimachine broadcast and frame speed control system synchronously by the refresh rate of display card that pre-sets from the film source data buffer, described video data is described film source sequence frame.
2. the method for synchronously playing multi-computer video based on refresh rate of display card as claimed in claim 1 is characterized in that, described film source play parameter comprises sheet source path, frame speed parameter and audio files path.
3. the method for synchronously playing multi-computer video based on refresh rate of display card as claimed in claim 1 is characterized in that, described node machine is play synchronously and frame speed control step processed also comprises afterwards:
Asynchronous communication model operating procedure: the broadcast of main control computer by asynchronous communication model control node machine, suspend, stop and switching film source and operate;
Node machine video playback ending step: the node machine is notified main control computer after video playback finishes;
Main control computer video playback ending step: main control computer receives after all node machine sowings put the message that finishes, and notice node machine stops broadcast state, switches to other mode of operations;
Program withdraws from step: the node machine withdraws from playing program after receiving ceasing and desisting order of main control computer, and the node machine discharges the described film source data buffer of creating simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010170754.3A CN101833935B (en) | 2010-05-06 | 2010-05-06 | Multi-machine video synchronous playing method based on display card refresh rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010170754.3A CN101833935B (en) | 2010-05-06 | 2010-05-06 | Multi-machine video synchronous playing method based on display card refresh rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101833935A CN101833935A (en) | 2010-09-15 |
| CN101833935B true CN101833935B (en) | 2013-07-10 |
Family
ID=42717988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010170754.3A Active CN101833935B (en) | 2010-05-06 | 2010-05-06 | Multi-machine video synchronous playing method based on display card refresh rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101833935B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102654823A (en) * | 2011-05-20 | 2012-09-05 | 上海华博信息服务有限公司 | Electronic signature information processing method and device for realizing different-screen real-time synchronous browsing |
| CN102609387B (en) * | 2012-02-14 | 2015-01-14 | 刘和 | General data synchronous transmission system and method |
| CN105657511B (en) * | 2015-12-29 | 2019-03-26 | 广州视源电子科技股份有限公司 | Image synchronous display method and device |
| CN111182226B (en) * | 2019-07-16 | 2021-07-23 | 北京欧比邻科技有限公司 | Method, device, medium and electronic equipment for synchronous working of multiple cameras |
| CN111193953B (en) * | 2020-01-14 | 2022-04-15 | 井冈山电器有限公司 | Display system and method for synchronizing videos of multiple spliced display screens |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7030883B2 (en) * | 2004-03-10 | 2006-04-18 | Evans & Sutherland Computer Corporation | System and method for filtering a synchronization signal from a remote computer |
| CN101256762A (en) * | 2008-03-21 | 2008-09-03 | 广东威创视讯科技股份有限公司 | Multiple-screen splitting and jointing method and device |
| CN101587431A (en) * | 2009-04-08 | 2009-11-25 | 广东威创视讯科技股份有限公司 | Method for realizing multi-screen playing video |
| CN101615108A (en) * | 2009-07-24 | 2009-12-30 | 广东威创视讯科技股份有限公司 | Multi-screen splicing apparatus and multi-screen splicing method thereof |
| CN101645261A (en) * | 2009-08-10 | 2010-02-10 | 广东威创视讯科技股份有限公司 | Line-field synchronous time sequence control method for separated screens in multi-screen display technique and system thereof |
-
2010
- 2010-05-06 CN CN201010170754.3A patent/CN101833935B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7030883B2 (en) * | 2004-03-10 | 2006-04-18 | Evans & Sutherland Computer Corporation | System and method for filtering a synchronization signal from a remote computer |
| CN101256762A (en) * | 2008-03-21 | 2008-09-03 | 广东威创视讯科技股份有限公司 | Multiple-screen splitting and jointing method and device |
| CN101587431A (en) * | 2009-04-08 | 2009-11-25 | 广东威创视讯科技股份有限公司 | Method for realizing multi-screen playing video |
| CN101615108A (en) * | 2009-07-24 | 2009-12-30 | 广东威创视讯科技股份有限公司 | Multi-screen splicing apparatus and multi-screen splicing method thereof |
| CN101645261A (en) * | 2009-08-10 | 2010-02-10 | 广东威创视讯科技股份有限公司 | Line-field synchronous time sequence control method for separated screens in multi-screen display technique and system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101833935A (en) | 2010-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101833935B (en) | Multi-machine video synchronous playing method based on display card refresh rate | |
| CN104168466B (en) | A kind of multi-screen audio video synchronization player method and device | |
| WO2019205886A1 (en) | Method and apparatus for pushing subtitle data, subtitle display method and apparatus, device and medium | |
| US9281013B2 (en) | Systems and methods for transmission of media content | |
| CN104837052B (en) | Play the method and device of multi-medium data | |
| CN103959807B (en) | Match the method for outputting and inputting timestamp in video encoder and advertisement inserter | |
| CN103347144B (en) | A kind of video synchronization method based on camera shooting | |
| CN102421035A (en) | Method and device for synchronizing audio and video of digital television | |
| CN107027046B (en) | Audio and video processing method and device for assisting live broadcast | |
| US11595731B2 (en) | Implementation method and system of real-time subtitle in live broadcast and device | |
| JP2002236480A (en) | Updating method of image frame on screen and display system | |
| CN108243350A (en) | A kind of method and apparatus of audio-visual synchronization processing | |
| CN103986960A (en) | Method for single-video picture division route teletransmission precise synchronization tiled display | |
| CN103475927A (en) | Online-video real-time speed change play method and system thereof | |
| CN103391467A (en) | Method for achieving synchronization of decoding and displaying of audio and video of network set-top box | |
| CN102075803B (en) | Method for synchronously playing video and audio | |
| CN110290411A (en) | Sound is automatically corrected in video display process draws nonsynchronous method | |
| US20230130611A1 (en) | Method and apparatus for synchronously playing video among multiple devices | |
| CN101290790B (en) | Synchronous playing method and device for both audio and video | |
| CN105280205A (en) | Nonlinear editing software audio and video synchronization processing method and device | |
| CN103442309A (en) | Method and device for keeping audio and video synchronization by using speed conversion algorithm | |
| CN103648011A (en) | Audio and video synchronization device and method based on HLS protocol | |
| CN103428584A (en) | Method and device for keeping synchronization of audio and video on multimedia playing platform | |
| CN106331820B (en) | Audio and video synchronization processing method and device | |
| CN103581730A (en) | Method for achieving synchronization of audio and video on digital set top box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 100048 room A, building A401, incubator Park, Beijing Normal University, 12 South College Road, Beijing, Haidian District Patentee after: Gvitech Corporation Address before: 100048 Beijing City, Haidian District Zhongguancun South Street No. 35 Zizhuyuan West Hospital Patentee before: Beijing Gvitech Digital City Technology Co., Ltd. |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Method for synchronously playing multi-computer video based on refresh rate of display card Effective date of registration: 20180307 Granted publication date: 20130710 Pledgee: Huaxia Bank Limited by Share Ltd Beijing Weigongcun branch Pledgor: Gvitech Corporation Registration number: 2018990000175 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20190517 Granted publication date: 20130710 Pledgee: Huaxia Bank Limited by Share Ltd Beijing Weigongcun branch Pledgor: Gvitech Corporation Registration number: 2018990000175 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220505 Address after: 100193 Building 13, East Yard, No. 10 Wangdong Road, Northwest Haidian District, Beijing Patentee after: GLODON Co.,Ltd. Address before: Room a401, block a, incubation building, Science Park, Beijing Normal University, No. 12, Xueyuan South Road, Haidian District, Beijing 100048 Patentee before: GVITECH Corp. |
|
| TR01 | Transfer of patent right |