CN102750962B - A kind of back method of video file and device - Google Patents
A kind of back method of video file and device Download PDFInfo
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Abstract
The invention provides a kind of back method of video file, in the method, the code stream that real-time analysis receives, frame index information is extracted from code stream, being in the video file of title with Information Monitoring by the frame data write in code stream, is in the index file of title with Information Monitoring by the write of frame index information; According to the Information Monitoring of carrying in playback request, the video file that acquisition title is mated with Information Monitoring and index file; According to the frame index information in the playback speed information of carrying in playback request and index file, read in video file the frame data preserved, and the playback of playback speed control frame data according to request.Present invention also offers a kind of playback reproducer of video file.Adopt method of the present invention and device, the real-time of playback can be improved, the speed of playback is controlled effectively.
Description
Technical field
The present invention relates to field of video monitoring, particularly a kind of back method of video file and device.
Background technology
Fig. 1 is the method flow diagram of the on-demand playback of existing surveillance video.Existing composition graphs 1, is described the method for the on-demand playback of existing surveillance video, specific as follows:
Step 101: the video flowing that real-time storage receives, forms the storage file that multiple filename comprises the video rise time, and the video duration that each storage file stores is less than or equal to the first scheduled duration;
In this step, the beginning part of each storage file is reserved with index area, the index information generated before playback is added into index area.In order to set up index faster, the first scheduled duration can be four minutes, five minutes or six minutes.
Step 102: according to the start time point of the playback video of asking in playback request, the filename of coupling storage file, finds the storage file including video corresponding to start time point in the video of storage as file destination;
The file destination mentioned in this step adds the storage file comprising start time point in the time period that the first scheduled duration forms for the video rise time in filename, or is that the interval of video rise time in filename and start time point is minimum and early than the storage file of start time point.
Step 103: index information is added to file destination;
This step is specially: carry out index analysis to the video flowing of file destination, obtains index information.Wherein, the side-play amount of each two field picture relative to file header and/or the time point at each two field picture place of video flowing is marked in index information.
Step 104: carry out the video playback from start time point according to index information.
In the method for the on-demand playback of existing surveillance video, in order to position the video of playback, the index file treating the video file of playback is set up before playback video file after storing video file, the reaction time of setting up index in replayed section is felt in order to make user, it is as far as possible shorter that the first scheduled duration that the video file stored is corresponding can be arranged, such as four minutes or five minutes etc., the video file of storage will be caused so too much, need when carrying out playback to search for a large amount of video files, carry out a large amount of comparisons, reduce the real-time of playback to a certain extent, and in the method for the on-demand playback of existing surveillance video, can not control the speed of playback, need further improvement.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of back method of video file, the method can improve the real-time of playback, effectively controls the speed of playback.
The object of the present invention is to provide a kind of playback reproducer of video file, this device can improve the real-time of playback, effectively controls the speed of playback.
For achieving the above object, technical scheme of the present invention is specifically achieved in that
A back method for video file, the method comprises:
The code stream that A, real-time analysis receive, extracts frame index information from code stream, and being in the video file of title with Information Monitoring by the frame data write in code stream, is in the index file of title with Information Monitoring by the write of frame index information;
B, according to the Information Monitoring of carrying in playback request, obtain the video file that mates with Information Monitoring of title and index file;
C, according to the frame index information in the playback speed information of carrying in playback request and index file, read in video file the frame data preserved, and the playback of playback speed control frame data according to request;
Described Information Monitoring at least comprises channel number, start time point and end time point.
In said method, described frame index information at least comprises: frame type, frame per second, file bias internal, frame time stamp and frame sign.
In said method, be that the video file of title comprises with Information Monitoring by the frame data write in code stream described in steps A:
A1, be in the current video file of title with Information Monitoring by frame data write;
Whether A2, the size detecting current video file exceed preset value, if so, perform steps A 3, otherwise perform steps A 1;
A3, set up the new video file that take Information Monitoring as title;
Start time point in the title of described new video file is the end time point in the title of video file current in steps A 1; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
In said method, be that the video file of title comprises with Information Monitoring by the frame data write in code stream described in steps A:
A1 ', record one write start time;
A2 ', be in the current video file of title with Information Monitoring by frame data write;
Whether the difference of the write start time of A3 ', detection current time and steps A 1 ' exceeds the default time period, if so, performs steps A 4 ', otherwise performs steps A 2 ';
A4 ', set up the new video file that take Information Monitoring as title;
Initial time in the title of described new video file is the end time point in the title of video file current in steps A 2 '; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
In said method, described step C comprises:
C1, according to the playback speed information of carrying in playback request, determine whether general playback, if so, perform step C2, otherwise perform step C3;
The frame data preserved in C2, reading video file also export, end operation afterwards;
C3, according to the frame per second in the playback speed information of carrying in playback request and frame index information, read the file bias internal in frame index information and frame sign, according to file bias internal and frame sign, from video file, read frame data and export, afterwards end operation.
A playback reproducer for video file, this device connects digital signal processor DSP, and this device comprises:
Code stream analysis module, real-time analysis, from the code stream of described DSP, extracts frame index information from code stream, by the video file in the frame data write memory module in code stream, by the index file in frame index information write memory module;
Playback controls module, according to the Information Monitoring of carrying in playback request, the video file mated with Information Monitoring and index file is read from memory module, according to the frame index information in the playback speed information of carrying in playback request and index file, read in video file the frame data preserved, and the playback of playback speed control frame data according to request;
Memory module, preserve with Information Monitoring be title video file and take Information Monitoring as the index file of title;
Described Information Monitoring at least comprises channel number, start time point and end time point.
In said apparatus, described frame index information at least comprises: frame type, frame per second, file bias internal, frame time stamp and frame sign.
In said apparatus, described code stream analysis module comprises:
Code stream receiving element, receives the coded data that described DSP exports, coded data is exported to code stream analysis unit;
Code stream analysis unit, peels off frame index information from the coded data received, and obtains frame data and frame index information, exports frame data and frame index information to first data write unit;
First data write unit, being write by frame data in memory module take Information Monitoring as the current video file of title, whether detecting the size of video file current in memory module beyond preset value, when exceeding preset value, setting up the new video file that take Information Monitoring as title;
The write of frame index information is in the index file of title with Information Monitoring by described first data write unit;
Start time point in the title of described new video file is the end time point in the title of current video file; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
In said apparatus, described code stream analysis module comprises:
Code stream receiving element, receives the coded data that described DSP exports, coded data is exported to code stream analysis unit;
Code stream analysis unit, peels off frame index information from the coded data received, and obtains frame data and frame index information, exports frame data and frame index information to second data write unit;
Second data write unit, record a write start time, being write by frame data in memory module take Information Monitoring as the current video file of title, detect current time and whether exceed the default time period with the difference of write start time, when exceeding the default time period, set up the new video file that take Information Monitoring as title;
The write of frame index information is in the index file of title with Information Monitoring by described second data write unit;
Initial time in the title of described new video file is the end time point in the title of current video file; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
In said apparatus, described playback controls module comprises:
Information matching unit, according to the Information Monitoring of carrying in the playback request received, video file and index file that title mates with Information Monitoring is read from memory module, export the playback speed information of carrying in the playback request received and index file to index extracting unit, export video file to data outputting unit;
Index extracting unit, according to the playback speed information of carrying in playback request, determine whether general playback, if, export first and be toggled to data outputting unit, otherwise, according to the frame per second that the frame index packets of information in the playback speed of asking and index file contains, read the file bias internal in frame index information and frame sign, export the second triggering, file bias internal and frame sign to data outputting unit;
Data outputting unit, triggers according to first, from video file, reads frame data, and according to general speed output frame data, according to the second triggering, file bias internal and frame sign, from video file, read frame data, according to the playback speed output frame data of request.
As seen from the above technical solutions, the invention provides a kind of back method of video file, in the method, the code stream that real-time analysis receives, frame index information is extracted from code stream, being in the video file of title with Information Monitoring by the frame data write in code stream, is in the index file of title with Information Monitoring by the write of frame index information; According to the Information Monitoring of carrying in playback request, the video file that acquisition title is mated with Information Monitoring and index file; According to the frame index information in the playback speed information of carrying in playback request and index file, read in video file the frame data preserved, and the playback of playback speed control frame data according to request.Present invention also offers a kind of playback reproducer of video file.Adopt method of the present invention and device, the real-time of playback can be improved, the speed of playback is controlled effectively.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the on-demand playback of existing surveillance video.
Fig. 2 is the back method process flow diagram of video file of the present invention.
Fig. 3 is the structural representation of the playback reproducer embodiment one of video file of the present invention.
Fig. 4 is the structural representation of the playback reproducer embodiment two of video file of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in more detail.
The invention provides a kind of back method and device of video file, in the method, while storage video file, set up corresponding with the frame data in video file when comprising the index file of frame index information, the title of video file of the present invention and the title of index file are all named according to Information Monitoring, when carrying out playback operation, the video file and index file that mate with it is obtained according to Information Monitoring, when being defined as not being general playback according to playback speed information, i.e. quick playback or at a slow speed playback, the frame index information of mating with playback speed is extracted from index file, the frame data exported when not being general playback by the acquisition of frame index Information locating, not only increase the real-time of playback, and the speed of playback can be controlled.
The code stream mentioned in the following embodiment of the present invention is audio/video flow, and frame data can be determined by frame type, can be voice data and/or video data.
Fig. 2 is the back method process flow diagram of video file of the present invention.Existing composition graphs 2, is described the back method of video file of the present invention, specific as follows:
Step 201: the code stream that real-time analysis receives, generates video file and index file;
This step is specially: step 2011, the code stream that real-time analysis receives, and extracts frame index information from code stream; Frame data write in code stream is in the video file of title with Information Monitoring by step 2012, and the write of frame index information is in the index file of title with Information Monitoring by step 2013.
Preferably, can comprise further between step 2011 and step 2012: generate the title of video file and the title of index file according to Information Monitoring.
Wherein, Information Monitoring at least comprises: channel number, start time point and end time point; Information Monitoring also can comprise the information for identifying memory attribute further and mark execution is recorded a video and the information of the equipment of playback.Frame index information at least comprises: frame type, frame per second, file bias internal, frame time stamp and frame sign; Also I frame period can be comprised further in frame index information; Frame type can be I frame, P frame or audio frame.
If video file supporting document size of the present invention carries out switching file according to preset value, then step 2012 specifically can comprise: step 20121, is in the current video file of title by frame data write with Information Monitoring; Step 20122, whether the size detecting current video file exceeds preset value, if so, performs step 20123, otherwise performs step 20121; Step 20123, sets up the new video file that take Information Monitoring as title.Wherein, the start time point in the title of new video file is the end time point in the title of video file current in steps A 1; End time point in the title of new video file obtains for being calculated by start time point and default time period.
If the duration that video file support of the present invention is preserved carries out switching file according to the time period of presetting, then step 2012 specifically can comprise: step 20121 ', record a write start time; Step 20122 ', be in the current video file of title with Information Monitoring by frame data write; Whether the difference of the write start time of step 20123 ', detect current time with step 20121 ' exceeds the default time period, if so, performs step 20124 ', otherwise execution step 20122 '; Step 20124 ', set up the new video file that take Information Monitoring as title.Wherein, the initial time in the title of new video file is step 20122 ' in current video file title in end time point; End time point in the title of new video file obtains for being calculated by start time point and default time period.
Step 202: according to the Information Monitoring of carrying in playback request, the video file that acquisition title is mated with Information Monitoring and index file;
In this step, first can compare to the title of video file according to Information Monitoring, obtain the video file that title is mated with Information Monitoring, then read index file according to video file.
Step 203: according to the frame index information in the playback speed information of carrying in playback request and index file, reads in video file the frame data preserved, and the playback of playback speed control frame data according to request;
This step comprises: step 2031, according to the playback speed information of carrying in playback request, determines whether general playback, if so, performs step 2032, otherwise performs step 2033; Step 2032, the frame data preserved in reading video file also export, end operation afterwards; Step 2033, according to the frame per second in the playback speed information of carrying in playback request and frame index information, read the file bias internal in frame index information and frame sign, according to file bias internal and frame sign, from video file, read frame data and export, afterwards end operation.
What the playback speed information mentioned in the present invention referred to is playback multiple, and such as, 1 multiple playback is defined as general playback, then the playback being greater than 1 multiple is quick playback, and the playback being less than 1 multiple is playback at a slow speed.Such as: when what playback speed information was corresponding is the quick playback of 2 multiples, frame index information is extracted at interval of 1 frame, again according to the file bias internal in the frame index information extracted and frame sign, from video file, read frame data of coupling, the frame data now exported are the data according to the quick playback of 2 multiple; When what playback speed information was corresponding is the playback at a slow speed of 1/2 multiple for playback multiple, if the frame per second in frame index information is 25 frames/second, then extract 25 frame index information every 2 seconds, obtain 25 frame data according to the file bias internal in 25 frame index information and frame sign, and read the data of 25 frames every 2 seconds and export.
Fig. 3 is the structural representation of the playback reproducer embodiment one of video file of the present invention.Existing composition graphs 3, is described the structure of the playback reproducer of the video file of the embodiment of the present invention one, specific as follows:
The playback reproducer of video file of the present invention can be installed on existing digital hard disc video recorder (DigitalVideoRecorder, DVR), linking number word signal processor (DigitalSignalProcessing, DSP), receives the coded data that DSP exports.
The playback reproducer of video file of the present invention comprises: memory module 30, code stream analysis module 31 and playback controls module 32.Wherein, code stream analysis module 31 connects DSP; Memory module 30 in order to preserve with Information Monitoring be title video file and take Information Monitoring as the index file of title; Information Monitoring at least comprises channel number, start time point and end time point.
Code stream analysis module 31 real-time analysis, from the code stream of DSP, extracts frame index information from code stream, by the video file in the frame data write memory module 30 in code stream, by the index file in frame index information write memory module 30.Wherein, code stream analysis module 31 of the present invention, can according to arranging the video file of setting up with Information Monitoring the sky being title in advance in memory module 30 and taking Information Monitoring as the index file of sky of title before storing the code stream received; Frame index information at least comprises: frame type, frame per second, file bias internal, frame time stamp and frame sign; Also the I frame period time can be comprised further in frame index information; Frame type is I frame, P frame or audio frame.
Playback controls module 32 is according to the Information Monitoring of carrying in playback request, the video file mated with Information Monitoring and index file is read from memory module 30, according to the frame index information in the playback speed information of carrying in playback request and index file, read in video file the frame data preserved, and the playback of playback speed control frame data according to request.
When the code stream analysis module 31 of the present embodiment stores video file, supporting document size carries out switching file according to preset value.Code stream analysis module 31 of the present invention comprises: code stream receiving element 311, code stream analysis unit 312 and the first data write unit 313.
Code stream receiving element 311 receives the coded data that DSP exports, and coded data is exported to code stream analysis unit.In addition, the title of the title of the video file generated according to Information Monitoring and index file also can write in memory module 30 by code stream receiving element 311.
Code stream analysis unit 312 peels off frame index information from the coded data received, and obtains frame data and frame index information, exports frame data and frame index information to first data write unit 313.Wherein, from in the coded data of DSP, DSP is written with the frame index information relevant with these frame data before every frame voice data and every frame data, and code stream analysis unit 312 is according to the structure of coded data, frame index information is separated, to obtain frame data and true index information from coded data.
It take Information Monitoring as the current video file of title that frame data write in memory module 30 by the first data write unit 313, whether detect the size of video file current in memory module 30 beyond preset value, when exceeding preset value, set up the new video file that take Information Monitoring as title.First data write unit 313 will be in the index file of title with Information Monitoring in frame index information write memory module 30.
Wherein, the first data write unit 313 also can set up a new video file for sky and the index file of new sky in storage unit 30; Start time point in the title of new video file is the end time point in the title of current video file; End time point in the title of new video file obtains for being calculated by start time point and default time period.
Wherein, playback controls module 32 comprises: information matching unit 321, index extracting unit 322 and data outputting unit 323.
Information matching unit 321 is according to the Information Monitoring of carrying in the playback request received, video file and index file that title mates with Information Monitoring is read from memory module 30, export the playback speed information of carrying in the playback request received and index file to index extracting unit 322, video file is exported to data outputting unit 323.
Index extracting unit 322 is according to the playback speed information of carrying in playback request, determine whether general playback, if, export first and be toggled to data outputting unit 323, otherwise, according to the frame per second that the frame index packets of information in playback speed information and index file contains, read the file bias internal in frame index information and frame sign, export the second triggering, file bias internal and frame sign to data outputting unit 323.
Data outputting unit 323 triggers according to first, frame data are read from video file, and according to general speed output frame data, according to the second triggering, file bias internal and frame sign, frame data are read, according to the playback speed output frame data of request from video file.
Fig. 4 is the structural representation of the playback reproducer embodiment two of video file of the present invention.Existing composition graphs 4, is described the structure of the playback reproducer of the video file of the embodiment of the present invention two, specific as follows:
The playback reproducer of the video file of embodiment two and embodiment one unlike, the code stream analysis module 41 in embodiment two, when storing video file, supports that the duration preserved carries out switching file according to the time period of presetting; Particularly, the second data write unit 413 in embodiment two is different from the first data write unit 313 of embodiment one, and other structures are identical with embodiment one, do not repeat them here.
Second data write unit 413 records a write start time, being write by frame data in memory module 30 take Information Monitoring as the current video file of title, detect current time and whether exceed the default time period with the difference of write start time, when exceeding the default time period, set up the new video file that take Information Monitoring as title.Second data write unit 413 will be in the index file of title with Information Monitoring in frame index information write memory module 30.
Wherein, the second data write unit 413 also can set up a new video file for sky and the index file of new sky in storage unit 30; Initial time in the title of new video file is the end time point in the title of current video file; End time point in the title of new video file obtains for being calculated by start time point and default time period.
In above-mentioned preferred embodiment of the present invention, when code stream is write video file, stores synchronized has been carried out to video file and index file, the playback of the frame index information recorded in index file to be follow-up be not general speed provides foundation, sets up index file and the impact of real-time on playback before avoiding playback; When carrying out the playback of non-1 multiple, the playback speed according to request extracts the frame index information in index file, utilizes the frame index information extracted to read frame data, achieves the control to playback speed.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. a back method for video file, is characterized in that, the method comprises:
The code stream that A, real-time analysis receive, extracts frame index information from code stream, and being in the video file of title with Information Monitoring by the frame data write in code stream, is in the index file of title with Information Monitoring by the write of frame index information;
B, according to the Information Monitoring of carrying in playback request, obtain the video file that mates with Information Monitoring of title and index file;
C, according to the frame index information in the playback speed information of carrying in playback request and index file, read in video file the frame data preserved, and the playback of playback speed control frame data according to request;
Described Information Monitoring at least comprises channel number, start time point and end time point;
Wherein, described step C comprises:
C1, according to the playback speed information of carrying in playback request, determine whether general playback, if so, perform step C2, otherwise perform step C3;
The frame data preserved in C2, reading video file also export, end operation afterwards;
C3, according to the frame per second in the playback speed information of carrying in playback request and frame index information, read the file bias internal in frame index information and frame sign, according to file bias internal and frame sign, from video file, read frame data and export, afterwards end operation.
2. method according to claim 1, is characterized in that, described frame index information at least comprises: frame type, frame per second, file bias internal, frame time stamp and frame sign.
3. method according to claim 1, is characterized in that, is that the video file of title comprises described in steps A by the frame data write in code stream with Information Monitoring:
A1, be in the current video file of title with Information Monitoring by frame data write;
Whether A2, the size detecting current video file exceed preset value, if so, perform steps A 3, otherwise perform steps A 1;
A3, set up the new video file that take Information Monitoring as title;
Start time point in the title of described new video file is the end time point in the title of video file current in steps A 1; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
4. method according to claim 1, is characterized in that, is that the video file of title comprises described in steps A by the frame data write in code stream with Information Monitoring:
A1 ', record one write start time;
A2 ', be in the current video file of title with Information Monitoring by frame data write;
Whether the difference of the write start time of A3 ', detection current time and steps A 1 ' exceeds the default time period, if so, performs steps A 4 ', otherwise performs steps A 2 ';
A4 ', set up the new video file that take Information Monitoring as title;
Initial time in the title of described new video file is the end time point in the title of video file current in steps A 2 '; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
5. a playback reproducer for video file, is characterized in that, this device connects digital signal processor DSP, and this device comprises:
Code stream analysis module, real-time analysis, from the code stream of described DSP, extracts frame index information from code stream, by the video file in the frame data write memory module in code stream, by the index file in frame index information write memory module;
Playback controls module, according to the Information Monitoring of carrying in playback request, the video file mated with Information Monitoring and index file is read from memory module, according to the frame index information in the playback speed information of carrying in playback request and index file, read in video file the frame data preserved, and the playback of playback speed control frame data according to request;
Memory module, preserve with Information Monitoring be title video file and take Information Monitoring as the index file of title;
Described Information Monitoring at least comprises channel number, start time point and end time point;
Wherein, described playback controls module comprises:
Information matching unit, according to the Information Monitoring of carrying in the playback request received, video file and index file that title mates with Information Monitoring is read from memory module, export the playback speed information of carrying in the playback request received and index file to index extracting unit, export video file to data outputting unit;
Index extracting unit, according to the playback speed information of carrying in playback request, determine whether general playback, if, export first and be toggled to data outputting unit, otherwise, according to the frame per second that the frame index packets of information in the playback speed of asking and index file contains, read the file bias internal in frame index information and frame sign, export the second triggering, file bias internal and frame sign to data outputting unit;
Data outputting unit, triggers according to first, from video file, reads frame data, and according to general speed output frame data, according to the second triggering, file bias internal and frame sign, from video file, read frame data, according to the playback speed output frame data of request.
6. device according to claim 5, is characterized in that, described frame index information at least comprises: frame type, frame per second, file bias internal, frame time stamp and frame sign.
7. device according to claim 5, is characterized in that, described code stream analysis module comprises:
Code stream receiving element, receives the coded data that described DSP exports, coded data is exported to code stream analysis unit;
Code stream analysis unit, peels off frame index information from the coded data received, and obtains frame data and frame index information, exports frame data and frame index information to first data write unit;
First data write unit, being write by frame data in memory module take Information Monitoring as the current video file of title, whether detecting the size of video file current in memory module beyond preset value, when exceeding preset value, setting up the new video file that take Information Monitoring as title;
The write of frame index information is in the index file of title with Information Monitoring by described first data write unit;
Start time point in the title of described new video file is the end time point in the title of current video file; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
8. device according to claim 5, is characterized in that, described code stream analysis module comprises:
Code stream receiving element, receives the coded data that described DSP exports, coded data is exported to code stream analysis unit;
Code stream analysis unit, peels off frame index information from the coded data received, and obtains frame data and frame index information, exports frame data and frame index information to second data write unit;
Second data write unit, record a write start time, being write by frame data in memory module take Information Monitoring as the current video file of title, detect current time and whether exceed the default time period with the difference of write start time, when exceeding the default time period, set up the new video file that take Information Monitoring as title;
The write of frame index information is in the index file of title with Information Monitoring by described second data write unit;
Initial time in the title of described new video file is the end time point in the title of current video file; End time point in the title of described new video file obtains for being calculated by start time point and default time period.
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| CN103873819B (en) * | 2012-12-13 | 2017-07-28 | 杭州海康威视数字技术股份有限公司 | The method and its system of video file quick playback in video monitoring |
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