CN101478681A - Generation method, system and multimedia device for fast forwarding and rewinding video file - Google Patents
Generation method, system and multimedia device for fast forwarding and rewinding video file Download PDFInfo
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- CN101478681A CN101478681A CNA2008102417729A CN200810241772A CN101478681A CN 101478681 A CN101478681 A CN 101478681A CN A2008102417729 A CNA2008102417729 A CN A2008102417729A CN 200810241772 A CN200810241772 A CN 200810241772A CN 101478681 A CN101478681 A CN 101478681A
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Abstract
The present invention is suitable for field of video technique, and provides a method for generating fast forward and fast rewind document, a system and a multimedia device thereof. The method comprises the following steps: obtaining key frames of equal-interval positions, and storing the key frame of first equal-interval position into the fast forward and fast rewind document; obtaining the prediction frames of equal-interval positions from the second equal-interval position; comparing the prediction frame with the key frames of equal-interval positions from the second equal-interval position; when the data volume of prediction frame is less than or equal to the data volume of key frame, storing the prediction frame into the fast forward and fast rewind document; or storing the key frame into the fast forward and fast rewind document. According to the invention, the key frames of equal-interval positions of source video document are extracted. Furthermore the prediction frames of equal-interval positions from the second equal-interval position are obtained. Data volume magnitude comparison is executed to the key frames and prediction frames. The frame with less data volume is stored in the fast forward and fast rewind document. The purpose of browsing the source video document with a same speed is realized and the transmission rate is increased.
Description
Technical field
The invention belongs to the video technique field, relate in particular to a kind of generation method, system and multimedia equipment of fast advance and retreat video file.
Background technology
Continuous development along with video technique, the fast-forward and fast-backward browsing of many multiples can be provided for the user, for example 2 times, 4 times, 8 times etc., when receiving the fast-forward and fast-backward browsing instruction of user's input, search in the video file of source and the key frame of video of the fast corresponding equal difference of the multiple position of advancing and retreat, and the extraction key frame, reformulate new video file, realize the fast-forward and fast-backward browsing of source video file by playing this new video file.
But when the frame that extracts in the equal difference position of source video file is non-key frame, search the key frame nearest with this equal difference position, key frame as this equal difference position, be stored in new video file, cause evenly browsing the source video file, there is certain error in the fast advance and retreat of source video file; And video file data volume amount is very big, is unfavorable in transmission over networks.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of generation method of fast advance and retreat video file, be intended to solve in the prior art and can't evenly browse the source video file, there is certain error in the fast advance and retreat of source video file, and video file data volume amount is very big, is unfavorable for the problem in transmission over networks.
The embodiment of the invention is achieved in that a kind of generation method of fast advance and retreat video file, and described method comprises the steps:
Obtain the key frame of video file equal difference position, source, and store the key frame of the first equal difference position into fast advance and retreat video file;
Obtain since the predictive frame of the equal difference position of second equal difference position;
Since second equal difference position, described predictive frame is compared with the key frame of corresponding equal difference position respectively;
When the data volume of described predictive frame is less than or equal to the data volume of described key frame, store described predictive frame into fast advance and retreat video file;
When the data volume of described predictive frame during, will store fast advance and retreat video file into since the key frame of second equal difference position greater than the data volume of described key frame.
Another purpose of the embodiment of the invention is to provide a kind of generation system of fast advance and retreat video file, and described system comprises:
The key frame acquisition module is used to obtain the key frame of video file equal difference position, source, and stores the key frame of the first equal difference position into fast advance and retreat video file;
The predictive frame acquisition module is used to obtain the predictive frame since the equal difference position of second equal difference position;
Comparing module is used for since second equal difference position, and described predictive frame is compared with the key frame of corresponding equal difference position respectively;
First memory module is used for storing described predictive frame into fast advance and retreat video file when the data volume of described predictive frame is less than or equal to the data volume of described key frame; And
Second memory module is used for will storing fast advance and retreat video file since the key frame of second equal difference position into when the data volume of described predictive frame during greater than the data volume of described key frame.
Another purpose of the embodiment of the invention is to provide a kind of multimedia equipment that comprises the generation system of fast advance and retreat video file.
In embodiments of the present invention, the key frame of extraction source video file equal difference position, and store the key frame of the first equal difference position into fast advance and retreat video file, obtain simultaneously since the predictive frame of the equal difference position of second equal difference position, to carry out the comparison of data volume size since the key frame of second the equal difference position predictive frame corresponding with it, the frame that data volume is less stores fast advance and retreat video file into, has realized evenly browsing the purpose of source video file, and has improved network transmission speed.
Description of drawings
Fig. 1 is the generation method realization flow figure of the fast advance and retreat video file that provides of the embodiment of the invention;
Fig. 2 is the realization flow figure of the key frame of the video file equal difference position, the source that obtains that provides of the embodiment of the invention;
Fig. 3 is the realization flow figure that non-key frame is encoded into key frame that the embodiment of the invention provides;
Fig. 4 is the realization flow figure of obtaining of providing of the embodiment of the invention since the predictive frame of the equal difference position of second equal difference position;
Fig. 5 (a) and (b) are schematic diagrames that the predictive frame that provides of the embodiment of the invention generates;
Fig. 6 is the structured flowchart of the generation system of the fast advance and retreat video file that provides of the embodiment of the invention;
Fig. 7 is the structured flowchart of the key-frame extraction module that provides of the embodiment of the invention;
Fig. 8 is the structured flowchart of the predictive frame acquisition module that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention, the key frame of extraction source video file equal difference position, and store the key frame of the first equal difference position into fast advance and retreat video file, obtain simultaneously since the predictive frame of the equal difference position of second equal difference position, to carry out the comparison of data volume size since the key frame of second the equal difference position predictive frame corresponding with it, the frame that data volume is less stores fast advance and retreat video file into.
Fig. 1 shows the generation method realization flow of the fast advance and retreat video file that the embodiment of the invention provides, and its detailed step is as described below:
In step S101, obtain the key frame of video file equal difference position, source, and store the key frame of the first equal difference position into fast advance and retreat video file, wherein, key frame is the key frame that equal difference position itself exists in the video file of source, or the key frame that the non-key frame coding of equal difference position is generated.
In step S102, obtain since the predictive frame of the equal difference position of second equal difference position.
In embodiments of the present invention, key frame and difference parameter with the equal difference position key frame adjacent key frame that find between the frame that generate of predictive frame by the equal difference position.
In step S103,, predictive frame is compared with the key frame of corresponding equal difference position respectively since second equal difference position.
In step S104, judge whether predictive frame is less than or equal to the key frame of equal difference position, be execution in step S105 then, otherwise execution in step S106.
In embodiments of the present invention, this judges that big or small process is the judgement to the data volume size of frame of video.
In step S105, when the data volume of predictive frame is less than or equal to the data volume of key frame, store predictive frame into fast advance and retreat video file.
In step S106,, will store fast advance and retreat video file into since the key frame of second equal difference position when the data volume of predictive frame during greater than the data volume of key frame.
In embodiments of the present invention, by above-mentioned flow process realize the fast advance and retreat video file that generates store active video file first equal difference position key frame and since the less predictive frame or the key frame of data volume of the equal difference position of second equal difference position, thereby the memory capacity of having saved fast advance and retreat video file.
As one embodiment of the present of invention, Fig. 2 shows the realization flow of the key frame of the video file equal difference position, the source that obtains that the embodiment of the invention provides, and its detailed step is as described below:
In step S201, the key frame of the first equal difference position and since the frame of video of the equal difference position of second equal difference position in the extraction source video file, this frame of video is key frame or non-key frame.
In step S202, store the key frame of the first equal difference position into fast advance and retreat video file.
In step S203, whether judgement is key frame since the frame of video of the equal difference position of second equal difference position, is then to finish; Otherwise execution in step S204.
In step S204, when the frame of video since the equal difference position of second equal difference position is non-key frame, non-key frame is encoded into key frame.
In embodiments of the present invention, the key frame of extraction source video file equal difference position when the frame of video of equal difference position is non-key frame, with the mode of this non-key frame by coding, generates key frame, and extracts.
As an alternative embodiment of the invention, Fig. 3 shows the realization flow that non-key frame is encoded into key frame that the embodiment of the invention provides, and its detailed step is as described below:
In step S301, search the key frame adjacent with the non-key frame of equal difference position.
In step S302, the non-key frame between non-key frame, the key frame adjacent with the non-key frame of equal difference position, non-key frame and the key frame adjacent with the non-key frame of equal difference position is decompressed respectively, reduction generates the picture frame of equal difference position.
In step S303, the picture frame of equal difference position is compressed the key frame of generation equal difference position.
As an alternative embodiment of the invention, Fig. 4 shows that the embodiment of the invention provides obtains since the realization flow of the predictive frame of the equal difference position of second equal difference position, and its detailed step is as described below:
In step S401, in fast advance and retreat video file, search the last frame of video adjacent with the non-key frame of equal difference position.
In step S402, equal difference position key frame and the last frame of video adjacent with equal difference position key frame are decompressed the picture frame of the picture frame of reduction generation equal difference position and the last frame of video adjacent respectively with equal difference position key frame.
In step S403, the picture frame of the picture frame of the equal difference position that reduction is generated and the last frame of video adjacent with equal difference position key frame compares, and obtains reducing difference parameter between the picture frame of the picture frame of the equal difference position that generates and the last frame of video adjacent with equal difference position key frame.
In step S404, generate the difference parameter between the picture frame of the picture frame of equal difference position and the last frame of video adjacent with equal difference position key frame according to reduction, generate the predictive frame of equal difference position.
In embodiments of the present invention, the mode that generates the predictive frame of equal difference position can be that this difference parameter is compressed, and also can be other modes, at this not in order to restriction the present invention.
In this embodiment of the invention, difference parameter between the key frame of equal difference position and the key frame adjacent with equal difference position key frame that find is the distinctive information between two frames, promptly be transformed into the key frame of equal difference position from the key frame adjacent that finds with equal difference position key frame, need the data volume parameter of conversion to be this difference parameter, in this embodiment, the key frame adjacent with equal difference position key frame that finds is for shown in Fig. 5 (a), equal difference position key frame is shown in Fig. 5 (b), the zone that do not change is represented in the place of two figure empty, the variation of two figure is: image " sun " coordinate is from (the A of Fig. 5 (a), B) change (C of Fig. 5 (b) into, D), wherein, in this embodiment, difference parameter is promptly described the coordinate conversion parameter of image " sun " attribute, " sun " abscissa A again changes C into, and ordinate changes D into by B, the conversion of other attributes, do not repeat them here, but not in order to restriction the present invention.
In embodiments of the present invention, after compare of analysis, the difference parameter that obtains is predictive frame.
Fig. 6 shows the structured flowchart of the generation system of the fast advance and retreat video file that the embodiment of the invention provides, for convenience of explanation, only show the part relevant with the embodiment of the invention among the figure, the generation system of the video file of advancing and retreat soon can be software unit, hardware cell or the software and hardware combining unit that is built in multimedia equipment.
The key frame of equal difference position in the key frame acquisition module 11 extraction source video files, and store the key frame of the first equal difference position into fast advance and retreat video file; Predictive frame acquisition module 12 obtains since the predictive frame of the equal difference position of second equal difference position; Comparing module 13 is since second equal difference position, and predictive frame is compared with the key frame of corresponding equal difference position respectively; When the data volume of predictive frame was less than or equal to the data volume of key frame, first memory module 14 stored this predictive frame into fast advance and retreat video file; When the data volume of predictive frame during greater than the data volume of key frame, second memory module 15 will store fast advance and retreat video file since the key frame of second equal difference position into.
As one embodiment of the present of invention, Fig. 7 shows the structured flowchart of the key frame acquisition module 11 that the embodiment of the invention provides, and for convenience of explanation, has only provided the part relevant with the embodiment of the invention among the figure.
The key frame of the first equal difference position and since the frame of video of the equal difference position of second equal difference position in the extraction module 111 extraction source video files; The 3rd memory module 112 stores the key frame of the first equal difference position in the video file of source into fast advance and retreat video file; Judge module 113 judges whether since the frame of video of the equal difference position of second equal difference position be key frame; When judge module 113 judges that when the frame of video of the equal difference position of second equal difference position was key frame, then predictive frame acquisition module 12 obtained since the predictive frame of the equal difference position of second equal difference position; When judge module 113 is judged when the frame of video of the equal difference position of second equal difference position is non-key frame, coding module 114 is encoded into key frame with non-key frame, simultaneously, predictive frame acquisition module 12 obtains since the predictive frame of the equal difference position of second equal difference position.
In embodiments of the present invention, first search module 1141 and search the key frame adjacent with the non-key frame of equal difference position; Non-key frame between 1142 pairs of non-key frames of first decompression module, the key frame adjacent with the non-key frame of equal difference position, non-key frame and the key frame adjacent with the non-key frame of equal difference position decompresses respectively, and reduction generates the picture frame of equal difference position; The picture frame of 1143 pairs of equal difference positions of compression module compresses the key frame that generates the equal difference position.
As an alternative embodiment of the invention, Fig. 8 shows the structured flowchart of the predictive frame acquisition module 12 that the embodiment of the invention provides, and for convenience of explanation, has only provided the part relevant with the embodiment of the invention among the figure.
In embodiments of the present invention, the key frame of extraction source video file equal difference position, and store the key frame of the first equal difference position into fast advance and retreat video file, obtain simultaneously since the predictive frame of the equal difference position of second equal difference position, to carry out the comparison of data volume size since the key frame of second the equal difference position predictive frame corresponding with it, the frame that data volume is less stores fast advance and retreat video file into, has realized evenly browsing the purpose of source video file, and has improved network transmission speed.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, a kind of generation method of fast advance and retreat video file is characterized in that, described method comprises the steps:
Obtain the key frame of video file equal difference position, source, and store the key frame of the first equal difference position in the video file of source into fast advance and retreat video file;
Obtain since the predictive frame of the equal difference position of second equal difference position;
Since second equal difference position, described predictive frame is compared with the key frame of corresponding equal difference position respectively;
When the data volume of described predictive frame is less than or equal to the data volume of described key frame, store described predictive frame into fast advance and retreat video file;
When the data volume of described predictive frame during, will store fast advance and retreat video file into since the key frame of second equal difference position greater than the data volume of described key frame.
2, the method for claim 1 is characterized in that, the described step of obtaining the key frame of video file equal difference position, source specifically comprises the steps:
The key frame of the first equal difference position and since the frame of video of the equal difference position of second equal difference position in the extraction source video file;
Whether the frame of video of judging described equal difference position since second equal difference position is key frame;
When the frame of video of described equal difference position since second equal difference position is key frame, then obtain since the predictive frame of the equal difference position of second equal difference position;
When the frame of video of described equal difference position since second equal difference position is non-key frame, described non-key frame is encoded into key frame, and obtains since the predictive frame of the equal difference position of second equal difference position.
3, method as claimed in claim 2 is characterized in that, the described step that described non-key frame is encoded into key frame specifically comprises the steps:
Search the key frame adjacent with the non-key frame of equal difference position;
Non-key frame between described non-key frame, the key frame adjacent with the non-key frame of equal difference position, described non-key frame and the key frame adjacent with the non-key frame of equal difference position is decompressed respectively, and reduction generates the picture frame of equal difference position;
Picture frame to described equal difference position compresses the key frame that generates described equal difference position.
4, method as claimed in claim 3 is characterized in that, described obtaining since the step of the predictive frame of the equal difference position of second equal difference position specifically comprises the steps:
In described fast advance and retreat video file, search the last frame of video adjacent with equal difference position key frame;
Described equal difference position key frame and the last frame of video adjacent with equal difference position key frame are decompressed respectively, and reduction generates the picture frame of equal difference position and the picture frame of the described last frame of video adjacent with equal difference position key frame;
The picture frame of the picture frame of the equal difference position that described reduction is generated and the described last frame of video adjacent with equal difference position key frame compares, and obtains the difference parameter between the picture frame of the picture frame of equal difference position of described reduction generation and the described last frame of video adjacent with equal difference position key frame;
Generate the difference parameter between the picture frame of the picture frame of equal difference position and the described last frame of video adjacent according to described reduction, the predictive frame of generation equal difference position with equal difference position key frame.
5, a kind of generation system of fast advance and retreat video file is characterized in that, described system comprises:
The key frame acquisition module is used to obtain the key frame of video file equal difference position, source, and stores the key frame of the first equal difference position into fast advance and retreat video file;
The predictive frame acquisition module is used to obtain the predictive frame since the equal difference position of second equal difference position;
Comparing module is used for since second equal difference position, and described predictive frame is compared with the key frame of corresponding equal difference position respectively;
First memory module is used for storing described predictive frame into fast advance and retreat video file when the data volume of described predictive frame is less than or equal to the data volume of described key frame; And
Second memory module is used for will storing fast advance and retreat video file since the key frame of second equal difference position into when the data volume of described predictive frame during greater than the data volume of described key frame.
6, system as claimed in claim 5 is characterized in that, described key frame acquisition module specifically comprises:
Extraction module is used for the key frame of the extraction source video file first equal difference position and since the frame of video of the equal difference position of second equal difference position;
The 3rd memory module is used for storing the key frame of the first equal difference position into fast advance and retreat video file;
Judge module is used to judge whether the frame of video of described equal difference position since second equal difference position is key frame; And
Coding module, be used for when judge module judges that the frame of video of described equal difference position since second equal difference position is non-key frame, described non-key frame is encoded into key frame, and simultaneously, the predictive frame acquisition module obtains since the predictive frame of the equal difference position of second equal difference position;
When described judge module judges that when the frame of video of the equal difference position of second equal difference position was key frame, then the predictive frame acquisition module obtained since the predictive frame of the equal difference position of second equal difference position.
7, system as claimed in claim 6 is characterized in that, described coding module specifically comprises:
First searches module, is used to search the key frame adjacent with the non-key frame of equal difference position;
First decompression module, be used for the non-key frame between described non-key frame, the key frame adjacent with the non-key frame of equal difference position, described non-key frame and the key frame adjacent with the non-key frame of equal difference position is decompressed respectively, reduction generates the picture frame of equal difference position; And
Compression module is used for the picture frame of described equal difference position is compressed the key frame that generates described equal difference position.
8, system as claimed in claim 7 is characterized in that, described predictive frame acquisition module specifically comprises:
Second searches module, is used for searching the last frame of video adjacent with equal difference position key frame at described fast advance and retreat video file;
Second decompression module is used for described equal difference position key frame and the last frame of video adjacent with equal difference position key frame are decompressed respectively, and reduction generates the picture frame of equal difference position and the picture frame of the described last frame of video adjacent with equal difference position key frame;
The compare of analysis module, be used for the picture frame of equal difference position that described reduction is generated and the picture frame of the described last frame of video adjacent and compare, obtain the difference parameter between the picture frame of the picture frame of equal difference position of described reduction generation and the described last frame of video adjacent with equal difference position key frame with equal difference position key frame; And
The predictive frame generation module is used for generating difference parameter between the picture frame of the picture frame of equal difference position and the described last frame of video adjacent with equal difference position key frame, the predictive frame of generation equal difference position according to described reduction.
9, a kind of multimedia equipment that comprises the generation system of the described fast advance and retreat video file of each claim of claim 5 to 9.
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| CN101478681B (en) | 2014-07-30 |
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