CN104853132A - Delay video recording method and system - Google Patents
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- CN104853132A CN104853132A CN201510243705.0A CN201510243705A CN104853132A CN 104853132 A CN104853132 A CN 104853132A CN 201510243705 A CN201510243705 A CN 201510243705A CN 104853132 A CN104853132 A CN 104853132A
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Abstract
The invention discloses a delay video recording method and system. The video recording method comprises: carrying out decoding and coding operations on a video source; carrying out random sampling on the coded video source; carrying out compression and storage operation on an image with a certain frame rate at a certain time interval; and then carrying out storage exit. The delay video recording system is composed of a data obtaining unit, a data decoding unit, a data encoding unit, an image sampling unit, and a data storage unit. According to the invention, because the number of frames of an image compressed in a video is reduced in unit time, the video quality is guaranteed and the video file size is reduced; and the occupied losses of the CPU are also reduced.
Description
Technical field
The present invention relates to a kind of video recording method and system, specifically relate to a kind of time delay video method for recording and system.
Background technology
Along with the development of computer science and the height of computer are popularized, in the field such as remote teaching, safety monitoring, all there is the application scenarios of video record.In safety monitoring, solve a case for convenience of judicial personnel and search evidence, usually video record can be stored; And in long-distance video teaching, video a kind of good preservation and the approach that conveys knowledge especially is recorded in the content of courses.
If current video record technology main manifestations mode is that recording mode view data be kept at together with voice data according to normal video in the middle of file is recorded, the video file size so recording out is larger.If adopt the recording mode of this standard inside safety monitoring, the amount of video so recording out is very surprising.This not only can expend a large amount of storage devices, also can consume manpower to process these a large amount of discarded records simultaneously.In criminal investigation, also can consume a large amount of manpowers check video file content.In addition, the words carrying out recorded video according to this video record standard are also very consume cpu resource.If open the video data that a thread records a video source, dominant frequency is the resource that the CPU of 2.3GHz will consume 50% nearly.
The process of usual video record be exactly constantly video flowing is wrapped in a cycle after the wide height of the frame per second and bit rate and video that set recording reading, decoding, coding and storage process.Feel that in order to make the naked eyes of people the video recorded is very smooth, the frame per second of usual video record can be set to 25fps, and that is when playing video file, the animation in 1 second that the eyes of people are seen is made up of 25 two field pictures.If therefore carry out video record according to normal 25fps frame per second, the video file so recording out can very large.
The method of existing reduction video record file size mainly contains two kinds: a kind of is the size being reduced video file by the frame per second of reduction video record.The major drawbacks of this mode is if frame per second is too little, and recording video display effect out can very poor, and beholder can be allowed to feel, and video blocks times very much.Another kind of mode is then the bit rate reducing video record, so-called bit rate be exactly when fixing frame per second each second recorded video content size, like this size of every two field picture content will reduce to some extent, thus the video file size recorded also can reduce relatively.But the video image quality recorded of this mode can very fuzzy, even can affect view content.
In prior art, mainly contain following convention video recording technology:
It is after setting frame per second and bit rate, carry out compressing and writing the process of mp4 file in an endless loop (in thread) that convention video records mode.The frame per second (fps) of video represents the amount of images play within a second, such as: 25fps is exactly rolling broadcasting 25 two field picture in the second.When recorded video frame per second little to 1fps time, namely only play 1 two field picture a second, therefore seem when video playback will give people a kind of card sensation, but be actually do not occur mend frame condition, for no other reason than that only have a two field picture in this 1s.
Therefore, if we want the size reducing video file when fixing frame per second recorded video, common settling mode is: the bit rate reducing video file.
In this common reduction bit rate mode, there is following defect:
If the too little meeting that bit rate is arranged causes video pictures unintelligible, thus can not arrange too little, the meeting that the video file size therefore recorded reduces is not obvious especially; What do not reach expection can ensure that video definition can reduce again the technique effect of recorded file size as far as possible.
Summary of the invention
The object of the invention is to solve deficiency of the prior art, providing a kind of settling mode and system by reducing the number of image frames be compressed in video in the unit interval to achieve while ensureing video quality, also reduce the size of video file time delay video method for recording and system.
A kind of time delay video method for recording of the present invention, comprises the steps:
Step 1, open video source device;
Step 2, judge the validity of input source, otherwise repeat step 1;
Step 3, from step 1 obtain source data read a packet decode;
Step 4, judge, to the decoding of packet whether success, if success, to enter step 5, otherwise read next packet and decode;
The encoder of step 5, the corresponding video format of initialization, and the data of successfully decoded are encoded, successful operation then enters step 6, otherwise continues the next packet of coding;
Step 6, the data flow that step 5 is encoded out is carried out to de-packaging operation and got frame to bag;
The video container of step 7, initialization corresponding video form, and the frame taken out step 6 successively carries out the operation of time delay encapsulation write video container;
Step 8, wait exit command, and exit command if receive, and close video container and also exit.
More preferably, adapted video source device described in step 1 comprises computer screen data source, the data source of camera collection, the one recorded in on-screen data source, web camera etc.Those skilled in the art should know, video source device is herein as just preferably exemplifying, the present invention does not regard this as a limit, at existing video source device that can be suitable with the video file of various form, all can as adapted video source device of the present invention, among the technical scheme all going for the application.
More preferably, encoder described in step 5 is to the decoding data of corresponding video form and encoding operation, and H.264 the corresponding coded format of described video format comprises, one H.261, H.263, H.263+, in MPEG-1, MPEG-2, MPEG-4, WMV1, FLV1 etc.As existing coding and decoding video form, all go among technical scheme of the present invention.Herein only as preferably exemplifying.
More preferably, time delay encapsulation write described in step 7 refers to that interval is carried out image with the sampling of certain frame per second compression storage operation at regular intervals.
More preferably, the described sampling compression storage operation in described step 7 is specially:
Create and open video container;
Time delay is waited for and is read next packet;
Read data packet packet;
Frame of video frame is decoded inside packet;
Say that frame of video frame writes video container;
Close video container.
In addition, another aspect of the present invention, provides a kind of time delay video recording system, it is characterized in that: comprising:
Data capture unit, this unit is used for providing initial data to whole video recording system, and the data that provide can be from any video source device;
Data decoding unit, for the initial data of acquisition is decoded as available valid data form, the data of this valid data form can be used for data encoding unit;
Data encoding unit, for by the image compression of got valid data form being the video code flow of corresponding video said shank;
Image sampling unit, resolves described video code flow and time delay sampling, and obtains picture frame;
Data storage cell, directly encodes to the picture frame that described time delay sampling obtains, restores in video record memory.
Preferably, described image sampling unit comprises further:
Video container creating unit: for creating and opening video container, and video container is closed after frame write video container completes;
Packet reading unit: wait for for time delay and read next packet;
Frame of video processing unit: for decoding frame of video in packet, and frame of video is write video container.
Above-mentioned unit is when specific works, created by video container creating unit and open video container, now packet reading unit reads next packet by the mode that time delay is waited for, after packet obtains, be transferred to frame of video processing unit, frame of video in packet is decoded by this unit, and decoded frame of video is written in the video container of video container creating unit establishment, before whole video file is disposed, circulation performs, until after video record is disposed, close video container.
Be not difficult to find out by technique scheme, beneficial effect of the present invention is: the invention provides a kind of settling mode and system by reducing the number of image frames be compressed in video in the unit interval, achieve while guarantee video quality, reduce the size of the video file stored, reduce the use accounting of CPU.
Accompanying drawing explanation
Fig. 1 is the course of work principle flow chart of one embodiment of the invention;
Fig. 2 is recording system theory diagram of the present invention.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.Those skilled in the art should know, following specific embodiment or embodiment, to be the present invention be explains the set-up mode of the series of optimum that concrete summary of the invention is enumerated further, and all can be combined with each other or interrelated use between those set-up modes, cannot carry out associating with other embodiment or execution mode and arrange unless clearly proposed wherein some or a certain specific embodiment or execution mode in the present invention or jointly use.Meanwhile, following specific embodiment or execution mode only as optimized set-up mode, and not as limiting the understanding of protection scope of the present invention.
Embodiment 1:
As shown in Figure 1, existing is example in h .264 format, describes the time delay video method for recording that the present invention proposes in detail, specifically comprises the steps:
Step 1, open video source device;
Step 2, judge the validity of input source, otherwise repeat step 1;
Step 3, from step 1 obtain source data read a packet decode;
Step 4, judge, to the decoding of packet whether success, if success, to enter step 5, otherwise read next packet and decode;
The encoder of step 5, the corresponding video format of initialization, and the data of successfully decoded are encoded, successful operation then enters step 6, otherwise continues the next packet of coding;
Step 6, the data flow that step 5 is encoded out is carried out to de-packaging operation and got frame to bag;
The video container of step 7, initialization corresponding video form, and the frame taken out step 6 successively carries out the operation of time delay encapsulation write video container;
Step 8, wait exit command, and exit command if receive, and close video container and also exit.
More preferably, adapted video source device described in step 1 comprises computer screen data source, the data source of camera collection, the one recorded in on-screen data source, web camera etc.Those skilled in the art should know, video source device is herein as just preferably exemplifying, the present invention does not regard this as a limit, at existing video source device that can be suitable with the video file of various form, all can as adapted video source device of the present invention, among the technical scheme all going for the application.
More preferably, encoder described in step 5 is to the decoding data of corresponding video form and encoding operation, and H.264 the corresponding coded format of described video format comprises, one H.261, H.263, H.263+, in MPEG-1, MPEG-2, MPEG-4, WMV1, FLV1 etc.As existing coding and decoding video form, all go among technical scheme of the present invention.Herein only as preferably exemplifying.
More preferably, time delay encapsulation write described in step 7 refers to that interval is carried out image with the sampling of certain frame per second compression storage operation at regular intervals.
More preferably, the described sampling compression storage operation in described step 7 is specially:
Create and open video container;
Time delay is waited for and is read next packet;
Read data packet packet;
Frame of video frame is decoded inside packet;
Say that frame of video frame writes video container;
Close video container.
Can clearly state for making technical scheme of the present invention; be described in detail with a concrete video record citing below; those skilled in the art should know; below illustrate only as a kind of concrete execution mode of the present invention to set forth technical scheme of the present invention further, not as limiting the explanation of scope.
What the present embodiment provided a kind ofly carries out video record to the mode that video code flow carries out the storage of time delay image sampling, and the video file recorded is very little, and recording process can discharge the occupancy that cpu resource greatly reduces CPU every now and then simultaneously.The process that time delay video is recorded roughly can be understood like this: to record the video content of a minute, if we when recording only by the 0th second, the 10th second, the 20th second, the 30th second ... the picture frame in the 60th second carries out compression with the frame per second of 7fps and stores, and the playout length of so last compression video file out will only have for 1 second.That is, except the file header of necessity and end-of-file only save 7 two field pictures in the middle of the video file finally preserved.Therefore this 7 two field picture can be understood to over one minute source video content with a video samples of interval 10 time delay in second.
The mode that the second way i.e. the present invention will adopt, example is recorded as with the 60s time, if we when recording only by 1s, 10s, 20s, the image of 30s... 60s carries out compression with the frame per second of 7fps and stores, and the so last video file lengths generated will only have 1s, namely only have 7 two field pictures.That is this 7 two field picture is just equivalent to the sampling of the picture recorded in this 60s.
The technical scheme that the invention process provides, when video record, first decodes to video signal input source.Again coding is carried out in h .264 format to decoding initial data out and generate H.264 video code flow.Common video record technology then direct by this video code flow stored in the middle of memory, the video file preserved like this is large, takies CPU very large in recording process simultaneously.
Embodiment 2:
The invention also proposes corresponding time delay video recording system, below in conjunction with Fig. 2, and the corresponding steps in Fig. 1, be described in detail.As shown in Figure 2, this system comprises:
Data capture unit, this unit is used for providing initial data to whole video recording system, and the data that provide can be from any video source device;
Data decoding unit, for the initial data of acquisition is decoded as available valid data form, the data of this valid data form can be used for data encoding unit below;
Data encoding unit, for being the video code flow of H.264 encoding by the image compression of got valid data form;
Image sampling unit, resolves the video code flow provided and time delay sampling;
Data storage cell, directly encodes to the picture frame of time delay sampling, restores in video record memory.
In a concrete execution mode, this image sampling unit comprises further:
Video container creating unit: for creating and opening video container, and video container is closed after frame write video container completes;
Packet reading unit: wait for for time delay and read next packet;
Frame of video processing unit: for decoding frame of video in packet, and frame of video is write video container.
Above-mentioned unit is when specific works, created by video container creating unit and open video container, now packet reading unit reads next packet by the mode that time delay is waited for, after packet obtains, be transferred to frame of video processing unit, frame of video in packet is decoded by this unit, and decoded frame of video is written in the video container of video container creating unit establishment, before whole video file is disposed, circulation performs, until after video record is disposed, close video container.
Applicant it should be noted that, in above-described embodiment, time point number, frame per second only illustrate, they all can select different scopes according to actual conditions.Above-described embodiment is only in h .264 format for example, and for other coded formats, if any H.261, H.263, H.263+ or MPEG-1, MPEG-2, MPEG-4 etc., this programme is also suitable for, and this is no longer going to repeat them.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (7)
1. a time delay video method for recording, is characterized in that, described method comprises the steps:
Step 1, open video source device;
Step 2, judge the validity of input source, otherwise repeat step 1;
Step 3, from step 1 obtain source data read a packet decode;
Step 4, judge, to the decoding of packet whether success, if success, to enter step 5, otherwise read next packet and decode;
The encoder of step 5, the corresponding video format of initialization, and the data of successfully decoded are encoded, successful operation then enters step 6, otherwise continues the next packet of coding;
Step 6, the data flow that step 5 is encoded out is carried out to de-packaging operation and got frame to bag;
The video container of step 7, initialization corresponding video form, and the frame taken out step 6 successively carries out the operation of time delay encapsulation write video container;
Step 8, wait exit command, and exit command if receive, and close video container and also exit.
2. method according to claim 1, is characterized in that: described in step 1, adapted video source device comprises: the data source of computer screen data source, camera collection, the one recorded in on-screen data source, web camera.
3. method according to claim 1, it is characterized in that: encoder described in step 5 is to the decoding data of corresponding video form and encoding operation, and H.264 the corresponding coded format of described video format comprises, any one H.261, H.263, H.263+, in MPEG-1, MPEG-2, MPEG-4, MJPEG, WMV1, FLV1.
4. method according to claim 1, is characterized in that: time delay encapsulation write described in step 7 refers to interval at regular intervals, carries out image with the sampling of certain frame per second compression storage operation.
5. method according to claim 4, is characterized in that: described sampling compression storage operation is specially:
Create and open video container;
Time delay is waited for and is read next packet;
Read data packet;
Frame of video is decoded from packet;
Frame of video is write video container;
Close video container.
6. a time delay video recording system, is characterized in that, described system comprises:
Data capture unit, for providing initial data to whole video recording system, the data that provide can be from any video source device;
Data decoding unit, for the initial data of acquisition is decoded as available valid data form, the data of this valid data form can be used for data encoding unit;
Data encoding unit, for by the image compression of got valid data form being the video code flow of corresponding video said shank;
Image sampling unit, resolves described video code flow and time delay sampling, and obtains picture frame;
Data storage cell, directly encodes to the picture frame that described time delay sampling obtains, restores in video record memory.
7. system according to claim 6, is characterized in that, described image sampling unit comprises further:
Video container creating unit: for creating and opening video container, and video container is closed after frame write video container completes;
Packet reading unit: wait for for time delay and read next packet;
Frame of video processing unit: for decoding frame of video in packet, and frame of video is write video container.
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