CN102623032B - Method for realizing synchronous playback of hard disk recorder - Google Patents
Method for realizing synchronous playback of hard disk recorder Download PDFInfo
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- CN102623032B CN102623032B CN201210096078.9A CN201210096078A CN102623032B CN 102623032 B CN102623032 B CN 102623032B CN 201210096078 A CN201210096078 A CN 201210096078A CN 102623032 B CN102623032 B CN 102623032B
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Abstract
The invention provides a method for realizing synchronous playback of a hard disk recorder. The hard disk recorder comprises a video play device; a control unit in the device reads videos of each channel from a storage medium and transmits the videos to an output unit; the output unit decodes and outputs the received videos; the control unit reads the video data of each channel from the storage medium according to playback time; the video timestamp of a first channel is taken as reference time, and the videos of other channels are synchronized in second level with the reference time; and the video data of each channel, which is received by the output unit, is synchronized in microsecond level. By the method for realizing the synchronous playback of the hard disk recorder, the videos of N channels are synchronized in millisecond level through two-time synchronization of the control unit and the output unit.
Description
Technical field:
The present invention relates to the method for the synchronized playback on watch-dog, particularly in numeral (network) DVR, realize the method for synchronized playback.
Background technology:
All frame of video of video file comprise I frame, B frame and P frame, and I frame is also referred to as key frame, I frame can be decoded separately, B frame and P frame must be with reference to I frame or P frame decodings above, and video frame rate depends on that user arranges, and common video type has N standard and P standard, when video type is N standard, video full frame rate was 30 frame/seconds, and when video type is P standard, video full frame rate was 25 frame/seconds.IP is than the ratio that is I frame and P frame in one group of frame of video, and conventional IP ratio is 25, in one group of video, has an I frame, 25 P frames.The each Frame of video file the inside can comprise a temporal information, is used for representing the acquisition time of this frame, is called the timestamp of this frame.
Video file playback appears on watch-dog as a basic function, requirement can this equipment of playback historical video file, the reproduction scene at that time of recording a video, early stage watch-dog is mainly supported single pass playing back videos, increasingly mature along with watch-dog, multiplexer channel synchronized playback function also engenders in watch-dog.The existing Multi-path synchronous playback in market implementation is generally synchronized to a second level at present, and in the time that playing, high speed (being more than or equal to 2 speeds) only retains I frame, lose the mode of all B, P frame, can lose a lot of useful video datas in special circumstances (in the situation that IP ratio being very large) like this.
Summary of the invention:
The object of the invention is: realize hyperchannel video recording synchronized playback, each video parameter (IP ratio, frame per second) of playing passage can be different, and other is synchronous to realize each passage video record Millisecond.Use the method can realize the individual video file of N (N>1) synchronously plays in various speeds (1/16,1/8,1/4,1/2,1,2X, 4X, 8X, 16X) situation.
For achieving the above object, the invention provides a kind of method that realizes DVR synchronized playback, wherein said video recorder comprises video play device, the video that control module in this device reads each passage from storage medium sends to output unit, output unit is to the video recording the receiving output of decoding, it is characterized in that: described control module is according to the time of playback, from storage medium, read each passage video recording data, stab as reference time according to the video time of first passage, the video recording of other passages with carry out second grade reference time and synchronize; And it is synchronous that output unit carries out Millisecond again to each passage video recording data that receive.
The present invention also provides a kind of video play device, described device comprises control module and output unit, the video that control module reads each passage from storage medium sends to output unit, output unit is to the video recording the receiving output of decoding, it is characterized in that: described control module is according to the time of playback, from storage medium, read each passage video recording data, stab as reference time according to the video time of first passage, other passages video recordings with carry out second grade reference time and synchronize; And it is synchronous that output unit carries out Millisecond again to each passage video recording data that receive.
The invention has the beneficial effects as follows 2 subsynchronous by control module and output unit, other is synchronous to make the individual passage video of N (N>1) realize Millisecond.
Brief description of the drawings:
Fig. 1 is the video play device schematic diagram in the present invention;
Fig. 2 is the control module process flow diagram in the present invention;
Fig. 3 is the output unit process flow diagram in the present invention.
Embodiment:
Below in conjunction with drawings and Examples, the present invention is further described.
The embodiment of the present invention is achieved in that as shown in Figure 1, a kind of video play device, described device comprises control module and output unit, the video that control module for example, reads each passage from storage medium (hard disk) sends to output unit, and output unit is to the video recording the receiving output of decoding.
Realizing method of the present invention is:
Control module is according to the time of playback, reads each passage video recording data from storage medium, stab as reference time according to the video time of first passage, other passages video recordings with carry out second grade reference time and synchronize.It is synchronous that output unit carries out Millisecond again to each passage video recording data that receive.
The process flow diagram of control module is referring to Fig. 2, and concrete steps comprise:
11) open N passage video according to Search Results, navigate to the frame of video that needs broadcasting;
12) according to the interval transmitting time of the frame per second calculating frame of video of broadcasting speed and each passage: due to each frame per second difference of playing passage, the interval transmitting time of the frame of video calculating is also different:
In the time that speed is not more than 1, send all I, B, P frame, the interval transmitting time of frame of video is calculated by formula below:
The scheduling time (formula 1.1) of transmitting time=1000000/, interval (speed * the video frame rate)-system of frame of video
In the time that speed is greater than 1, send I frame, and part B, P frame, the interval transmitting time of frame of video and send B, P frame frame number Frame and calculate according to formula below:
Frame=rounds (IP ratio/speed) (formula 1.2)
The in the situation that of Frame>=1
The scheduling time (formula 1.3) of interval transmitting time=1000000*IP ratio/(video frame rate * (Frame+1))-system of frame of video
The in the situation that of Frame<1
The scheduling time (formula 1.4) of transmitting time=1000000/, the interval speed-system of frame of video
13) obtain N passage video frame rate minimum value (being minimum frame per second) and be sent to output unit, then send N passage audio, video data to output unit; And stab as reference time according to the video time of first passage, the video recording of other passages with carry out second grade reference time and synchronize: video time equals normal play reference time; Be less than and current passage to be dealt with video time be all sent to output unit to all video I frames between reference time reference time; Be greater than and wait for reference time; The control module control synchronized video recording time is to the rank of second;
14) receive and process user's various control commands: put soon, put slowly, frame enters, rewind down, the order such as suspend, stop, dragging progress bar, advance 30 seconds and retreat 30 seconds.
1, put soon, put slowly processing: in the time that playback rate is greater than 1 speed, stops audio frequency and play, play key frame (I frame) and part B, P frame, while being not more than 1 speed, play all types of frame data (I frame P frame B frame); Change broadcasting speed, need to recalculate delay time, and send broadcasting speed to output unit.
2, frame enters to process: play a frame only after, enter halted state, wait for that frame next time enters order.
3, rewind down processing: after playing current 1S video recording frame, all passage video recordings retreat 2S to be continued to play at every turn, and so circulation is until first passage plays to video file head.And send rewind down state to output unit.
4, suspend and process: enter halted state, stop sending data to output unit, cease and desist order and need to reopen video file, and send the data of first second.
5, stop processing: enter halted state, reopen video file, and send the data of first second, send halted state to output unit.
6, drag progress bar, advance 30 seconds and retreat processing in 30 seconds: locate N and play the passage precalculated position of recording a video, send and drag state to output unit.
The process flow diagram of output unit is referring to Fig. 3, and concrete steps comprise:
21) audio/video frames that buffer control unit sends;
22) the minimum frame per second sending according to control module calculates threshold value Tmin
(μ is (formula 1.5) s) for the minimum frame per second of Tmin=1000000/
23) will receive voice data and directly send to audio decoder, judge whether to need Millisecond for video data synchronous, not need directly to give corresponding decoding passage, if need are according to method is synchronous below: obtain all passage minimum time stamp t
minvideo frame, and give corresponding decoding channels by this frame; Other passage video frame time stamp and t
mindifference while being less than threshold value Tmin, give corresponding decoding channels by this frame;
24) reception control unit sends state or order response:
1, put soon, put slowly processing: in the time that speed is greater than 1 speed, cancel Millisecond synchronous;
2, rewind down processing: cancel Millisecond synchronous;
3, suspend, stop to process: suspend video output;
4, drag progress bar, advance 30 seconds and retreat processing in 30 seconds: empty screen buffer.
25), by the audio, video data of decoding, give output device and show.
Below in conjunction with drawings and Examples, the present invention is further described, but content of the present invention is not limited to this.
The synchronized video recording playback mode of watch-dog set forth in the present invention realizes, and can realize the synchronized playback function of N passage video recording by this kind of back method.
Further illustrate: the video data that is all 25 frames per second with 16 channel coding frame per second of 1 speed playback:
11) main control unit sends 1 speed and minimum frame per second 25 frames to output unit;
12) output unit calculates Tmin=40000 μ s according to formula 1.5
13) main control unit is according to 1.1 computation delay times of formula (the interval transmitting time of frame of video):
The scheduling time of transmitting time=1000000/, interval (speed * the video frame rate)-system of frame of video
The scheduling time of this system is relevant to operating system, and the scheduling time of supposing the system is 10000 μ s, time delay=1000000/ (1*25) ?10000=30000 μ s.
Taking 8 passage videos of 4 speed playback as example, getting the system call time is here 10000 μ s, and 8 passage video parameters are as follows:
Show 1:8 channel parameters and the time delay calculating according to formula and Frame
| ? | Passage 1 | Passage 2 | Passage 3 | Passage 4 | Passage 5 | Passage 6 | Passage 7 | Passage 8 |
| Frame per second | 25 | 20 | 15 | 10 | 25 | 4 | 8 | 20 |
| IP ratio | 25 | 20 | 25 | 2 | 10 | 255 | 16 | 100 |
| Time delay (ms) | 132857 | 156666 | 238095 | 250000 | 123333 | 986094 | 400000 | 182307 |
| Frame | 6 | 5 | 6 | 0 | 2 | 63 | 4 | 25 |
The minimum frame per second of 8 passages is 4, calculates Tmin=25000 μ s according to formula 1.5.
From above embodiment, the present invention can realize the synchronized playback of N video file.Certainly, the present invention is based on and have various embodiments.Only otherwise deviate from the situation of the present invention's spirit and essence, those of ordinary skill in the art can make appropriate change, distortion and optimization according to the demand of oneself, but these apply the protection domain that all belongs to the appended claim of the present invention.The invention has the beneficial effects as follows: 2 subsynchronous by control module and output unit, other is synchronous to make the individual passage video of N (N>1) realize Millisecond.
Claims (9)
1. a video play device, described device comprises control module and output unit, the video that control module reads each passage from storage medium sends to output unit, output unit is to the video recording the receiving output of decoding, it is characterized in that: described control module is according to the time of playback, from storage medium, read each passage video recording data, stab as reference time according to the video time of first passage, other passages video recordings with carry out second grade reference time and synchronize; And it is synchronous that output unit carries out Millisecond again to each passage video recording data that receive; Described output unit is realized the synchronous step of Millisecond and is comprised:
1) audio/video frames that buffer control unit sends;
2) the minimum frame per second sending according to control module calculates threshold value Tmin;
3) will receive voice data and directly send to audio decoder, judge whether to need Millisecond for video data synchronous;
4) reception control unit sends state or order response;
5), by the audio, video data of decoding, give output device and show.
2. realize the method for DVR synchronized playback for one kind, wherein said video recorder comprises video play device, the video that control module in this device reads each passage from storage medium sends to output unit, output unit is to the video recording the receiving output of decoding, it is characterized in that: described control module is according to the time of playback, from storage medium, read each passage video recording data, stab as reference time according to the video time of first passage, the video recording of other passages with carry out second grade reference time and synchronize; And it is synchronous that output unit carries out Millisecond again to each passage video recording data that receive; Described output unit is realized the synchronous step of Millisecond and is comprised:
1) audio/video frames that buffer control unit sends;
2) the minimum frame per second sending according to control module calculates threshold value Tmin;
3) will receive voice data and directly send to audio decoder, judge whether to need Millisecond for video data synchronous;
4) reception control unit sends state or order response;
5), by the audio, video data of decoding, give output device and show.
3. method according to claim 2, is characterized in that, described control module is realized second synchronous step of level and comprised:
1) open N passage video according to Search Results, navigate to the frame of video that needs broadcasting;
2) according to the interval transmitting time of the frame per second calculating frame of video of broadcasting speed and each passage;
3) obtain the minimum frame per second of N passage video and be sent to output unit, then send N passage audio, video data to output unit, and stab as reference time according to the video time of first passage, other passages are recorded a video and are carried out second grade reference time and synchronize;
4) receive and process user's various control commands.
4. method according to claim 3, is characterized in that, realizes second synchronous step 2 of level at described control module) in the computing method of interval transmitting time as follows:
In the time that speed is not more than 1, send all I, B, P frame, the interval transmitting time computing formula of frame of video: the scheduling time of transmitting time=1000000/, interval (speed * the video frame rate)-system of frame of video;
In the time that speed is greater than 1, send I frame, and part B, P frame, the interval transmitting time of frame of video and send B, P frame frame number Frame and calculate according to formula below:
Frame=rounds (IP ratio/speed)
The in the situation that of Frame>=1:
The scheduling time of interval transmitting time=1000000*IP ratio/(video frame rate * (Frame+1))-system of frame of video;
The in the situation that of Frame<1:
The scheduling time of transmitting time=1000000/, the interval speed-system of frame of video;
Described IP is than the ratio that is I frame and P frame in one group of frame of video.
5. method according to claim 3, is characterized in that, realizes second synchronous described step 3 of level at described control module) in realize a second grade synchronous method and be: video time equals normal play reference time; Be less than and current passage to be dealt with video time be all sent to output unit to all video I frames between reference time reference time; Be greater than and wait for reference time, the control module control synchronized video recording time is to the rank of second.
6. method according to claim 3, it is characterized in that, realize the synchronous described step 4 of Millisecond at described output unit) in order comprise soon put, put slowly, frame enters, rewind down, suspend, stop, dragging progress bar, advance 30 seconds and retreat order in 30 seconds.
7. method according to claim 6, it is characterized in that, realize the synchronous step 3 of Millisecond at described output unit) in judge whether to need the synchronous method of Millisecond to be: do not need directly to give corresponding decoding passage when being judged as, if need are according to method is synchronous: obtain all passage minimum times stamp t below
minvideo frame, and give corresponding decoding channels by this frame; Other passage video frame time stamp and t
mindifference while being less than threshold value Tmin, give corresponding decoding channels by this frame.
8. according to the method described in claim 6 or 7, it is characterized in that, realize the synchronous step 4 of Millisecond at described output unit) described in respond and comprise: put soon, put slowly processing; Rewind down processing; Suspend, stop processing; Drag progress bar, advance 30 seconds and retreat processing in 30 seconds.
9. method according to claim 8, is characterized in that, realizes the synchronous step 2 of Millisecond at described output unit) described in threshold calculations formula be: the minimum frame per second of Tmin=1000000/, unit is μ s.
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| CN104639862B (en) * | 2013-11-11 | 2019-04-12 | 杭州海康威视数字技术股份有限公司 | The back method and device of video file |
| CN104702876B (en) * | 2014-01-22 | 2017-12-01 | 杭州海康威视数字技术股份有限公司 | A kind of Multi-path synchronous back method and device |
| CN104410807B (en) * | 2014-11-24 | 2018-04-20 | 深圳市华宝电子科技有限公司 | A kind of multi-channel video synchronized playback method and device |
| CN105307013B (en) * | 2015-10-22 | 2020-09-22 | 厦门雅迅网络股份有限公司 | Fast forward playing video frame selection method |
| CN106658058B (en) * | 2016-10-13 | 2019-12-13 | 厦门蓝斯通信股份有限公司 | video sending rate synchronization management method and management system based on multiple clients |
| CN107231574A (en) * | 2017-07-05 | 2017-10-03 | 北京辰安信息科技有限公司 | Video broadcasting method and video play device |
| CN108966027A (en) * | 2018-08-15 | 2018-12-07 | 郑州云海信息技术有限公司 | A kind of audio video synchronization back method and device |
| CN112752129A (en) * | 2019-10-31 | 2021-05-04 | 西安诺瓦星云科技股份有限公司 | Video source synchronous output method, device, system and computer readable storage medium |
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