CN103686411A - Method for playing video and multimedia device - Google Patents
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Abstract
The invention relates to a method for playing a video and a multimedia device. The method for playing the video comprises the steps of recording a current playing moment t1 when a fast-forward and fast-backward playing request is received in the process of playing a video file, and obtaining a high-speed file which is generated in advance; searching for a key frame, corresponding to the current playing moment t1, in the high-speed file; switching a picture which is played at present to a picture corresponding to the searched key frame; obtaining the playing speed, and playing data of the key frame according to a preset playing mode corresponding to the playing speed. According to the method for playing the video and the multimedia device, smoothness of video playing can be improved when the content of the video is rapidly browsed.
Description
Technical field
The present invention relates to Play Technique for Multimedia field, relate in particular to a kind of player method and multimedia equipment of video.
Background technology
Multimedia equipment is when playing local video or playing network Online Video, and it is a kind of conventional play operation that user carries out fast forwarding and fast rewinding broadcasting as required.User can use drag and drop to play and identify and carry out rough function of browse, or uses fast forwarding and fast rewinding function fast browsing video content.When fast browsing video content, user requires the fineness higher than picture to the fluency of picture.
While using drag and drop to play sign to carry out rough browsing, owing to being that user carries out drag and drop control, be generally too fast or excessively slow during display of video content, play content is smooth not.When using fast forwarding and fast rewinding function fast browsing, in prior art, there are two kinds of modes, a kind of is all frames of decoded video, then than the speed of fast several times of constant speed, play back, this mode has high requirement for disposal ability and the network bandwidth of hardware processor, and in the situation that multimedia equipment is used mobile Internet, because the disposal ability of hardware processor is lower and the network bandwidth is less, therefore inapplicable, dwindled the scope of using.Another kind of mode is to extract the I frame of former video, and I frame (intra frame, inner picture) also claims key frame, for compressing in frame, is by removing as far as possible image space redundant information, to carry out the in-frame encoding picture of amount of compressed data.According to I frame, form index, due to the I frame extracting inhomogeneous, the I frame period time does not have the regulation (as an I frame just appears for several seconds in interval) of standard, and when carrying out the quick broadcasting such as 2 speeds, 4 speeds, picture is not smooth, the fluctuation of picture plot is very large, it is sometimes fast and sometimes slow that video shows, broadcasting speed is bad control also, even if insert the method with the duplicate frame of former frame between frame, also may cause picture to pause, therefore above-mentioned two schemes is difficult to meet user's demand.
Summary of the invention
Main purpose of the present invention is to provide a kind of player method and multimedia equipment of video, is intended to improve the fluency of video playback when fast browsing video content.
In order to achieve the above object, the present invention proposes a kind of player method of video, comprises the following steps:
In the process of playing video file, when receiving fast forwarding and fast rewinding playing request, record current broadcasting t1 constantly, and obtain the rapid file generating in advance;
Search and the current key frame of playing in the rapid file that t1 is corresponding constantly;
By the Picture switch of current broadcasting to picture corresponding to the key frame searching;
Obtain broadcasting speed, according to the default broadcast mode corresponding with described broadcasting speed, play described key frame data.
Preferably, described in the process of playing video file, when receiving fast forwarding and fast rewinding playing request, record current broadcasting t1 constantly, and comprise before obtaining the step of the rapid file generating in advance:
According to video file, generate rapid file.
Preferably, according to the step of video file generation rapid file, comprise:
Evenly extract the frame of video picture in video file, obtain the broadcast information of described frame of video picture;
Described frame of video picture is carried out to convergent-divergent and coding processing, generate key frame data;
According to the broadcast information of described frame of video picture, obtain the broadcast information of described key frame, and according to the big or small generating indexes information of the broadcast information of described key frame and described key frame;
Integrate described key frame and described index information, obtain described rapid file.
Preferably, described search comprises with the current step of playing the key frame in the rapid file that t1 is corresponding constantly:
According to playing t1 and the search of described index information and the current key frame of playing in the rapid file that t1 is corresponding constantly constantly.
Preferably, described method also comprises:
When receiving fast forwarding and fast rewinding, finish after playing request, record current broadcasting t2 constantly, and search and the current frame of video picture of playing the video file that t2 is corresponding constantly;
The Picture switch of current broadcasting to the frame of video picture searching is also play.
The present invention also provides a kind of multimedia equipment, comprising:
Acquisition module, for the process at playing video file, when receiving fast forwarding and fast rewinding playing request, records current broadcasting t1 constantly, and obtains the rapid file generating in advance;
The first search module, for searching for and the current key frame of playing the rapid file that t1 is corresponding constantly;
The first handover module, for by the Picture switch of current broadcasting to picture corresponding to the key frame searching;
Playing module, for obtaining broadcasting speed, plays described key frame data according to the default broadcast mode corresponding with described broadcasting speed.
Preferably, described multimedia equipment also comprises generation module, for generating rapid file according to video file.
Preferably, described generation module comprises:
Extracting unit, for evenly extracting the frame of video picture of video file, obtains the broadcast information of described frame of video picture;
The first generation unit, for described frame of video picture being carried out to convergent-divergent and coding processing, generates key frame data;
The second generation unit, for obtain the broadcast information of described key frame according to the broadcast information of described frame of video picture, and according to the big or small generating indexes information of the broadcast information of described key frame and described key frame;
Integral unit, for integrating described key frame and described index information, obtains described rapid file.
Preferably, described the first search module is specifically for according to playing, moment t1 and described index information are searched for and the current key frame of playing in the rapid file that t1 is corresponding constantly.
Preferably, described multimedia equipment also comprises:
The second search module, for finishing after playing request when receiving fast forwarding and fast rewinding, records current broadcasting t2 constantly, and search and the current frame of video picture of playing the video file that t2 is corresponding constantly;
The second handover module, for also playing the Picture switch of current broadcasting to the frame of video picture searching.
Player method and the multimedia equipment of a kind of video that the present invention proposes, while receiving fast forwarding and fast rewinding playing request in the process of playing video file, according to current broadcasting, search for the key frame in rapid file constantly, because rapid file is that the frame of video picture evenly extracting in video file generates, its frame per second and resolution are far below frame per second and the resolution of video file, when user selects fast forwarding and fast rewinding to play with browsing video content, by the Picture switch of current broadcasting to picture corresponding to the key frame searching, reach comparatively smooth result of broadcast, in the playing process of fast forwarding and fast rewinding, according to the default broadcast mode corresponding with playing speed, play, i.e. low speed and the corresponding different default broadcast mode of high speed, when low speed, all play and reach smooth effect, also can smooth playing even if exceed the hardware handles ability of playback equipment when high speed.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of player method first embodiment of video of the present invention;
Fig. 2 is the schematic flow sheet of player method second embodiment of video of the present invention;
Fig. 3 is the schematic flow sheet that generates rapid file shown in Fig. 2;
Fig. 4 is the schematic flow sheet of player method the 3rd embodiment of video of the present invention;
Fig. 5 is the structural representation of multimedia equipment the first embodiment of the present invention;
Fig. 6 is the structural representation of multimedia equipment the second embodiment of the present invention;
Fig. 7 is the structural representation of generation module shown in Fig. 6 of the present invention;
Fig. 8 is the structural representation of multimedia equipment of the present invention the 3rd embodiment.
In order to make the technical scheme of invention clearer, to understand, below in conjunction with accompanying drawing, be described in further detail.
Embodiment
Particularly, as shown in Figure 1, one embodiment of the invention proposes a kind of player method of video, comprising:
Step S101, in the process of playing video file, when receiving fast forwarding and fast rewinding playing request, records current broadcasting t1 constantly, and obtains the rapid file generating in advance;
In the present embodiment, multimedia equipment can be television set, computer or smart mobile phone etc.
Rapid file is evenly to extract frame of video picture in video file and generate in advance, and the frame per second of the frame in this rapid file and resolution are far below frame per second and the resolution of video file, if the frame per second of video file is 25fps (frame is per second), the frame per second of rapid file can be 10fps or lower so, and resolution can be video file video data resolution 1/4 or 1/9, therefore the data volume of rapid file is less, and required memory space is also less.When user's fast forwarding and fast rewinding is play with browsing video content, can play the frame in this rapid file, reach comparatively smooth result of broadcast.
Step S102, search and the current key frame of playing in the rapid file that t1 is corresponding constantly;
The reproduction time information of the key frame of rapid file is consistent with the reproduction time information of the frame of video picture of video file, but the number of frame is less than video file, if current broadcasting constantly t1 just can be found in rapid file, play so the frame of the moment correspondence from finding, otherwise choose the current t1 frame forward of playing constantly as start frame.Because rapid file is corresponding with the reproduction time information of video file, the quick and precisely location that therefore can also realize video in the playing process of fast forwarding and fast rewinding.
In the present embodiment, when receiving fast forwarding and fast rewinding playing request, need to record current broadcasting t1 constantly, to can play corresponding key frame in the rapid file of t1 search constantly according to this.
Step S103, by the Picture switch of current broadcasting to picture corresponding to the key frame searching;
Because the reproduction time information of video file is corresponding with the reproduction time information in rapid file, must search and the key frame of playing the rapid file that t1 is corresponding constantly.When searching and playing after the key frame that t1 is corresponding constantly, current video pictures is switched to the picture that key frame is corresponding, to carry out F.F. or fast reverse play.
Step S104, obtains broadcasting speed, according to the default broadcast mode corresponding with described broadcasting speed, plays described key frame data.
The present embodiment speed can roughly be divided into high speed and low speed, and definable 2 speeds, 4 speeds and 8 speeds are low speed, and definition 16 speeds and 32 speeds are high speed.Broadcast mode corresponding to default different speed, as while be low speed, can all play the I-frame video data in rapid file, during for high speed, can optionally play the I-frame video data in rapid file, with this, reach the smooth effect of broadcasting.
Particularly, under low speed, in order to make broadcasting pictures as far as possible level and smooth, can play all key frames in rapid file, for example the frame per second of rapid file is 5fps, can realize 2 speeds by broadcasting 10 frames per second, or broadcasting per second 20 frames is realized 4 speeds etc.Under high speed, even if only play rapid file, also may exceed the disposal ability of multimedia equipment hardware, now need selectivity to play the key frame of rapid file.In a preferred embodiment, the frame per second of supposing rapid file is f, playing speed is t, the fastest broadcasting 25 frames per second of multimedia equipment, the frame number of having play is n1, the frame number that altogether will play is n2, if (n1/n2) < (25/ (f*t)), play this key frame, otherwise, this key frame ignored.If when only playing the key frame of about 1/3 quantity in rapid file and realizing 16 speed, namely only play the 1st key frame, the 4th key frame and the 7th key frame etc., and the like play.Due to playing fluency as preferential demand, can reduce the requirement to multimedia equipment hardware handles ability and the network bandwidth.
In the present embodiment, while receiving fast forwarding and fast rewinding playing request in the process of playing video file, according to current broadcasting, search for the key frame in rapid file constantly, because rapid file is that the frame of video picture evenly extracting in video file generates, its frame per second and resolution are far below frame per second and the resolution of video file, when user selects fast forwarding and fast rewinding to play with browsing video content, by the Picture switch of current broadcasting to picture corresponding to the key frame searching, reach comparatively smooth result of broadcast, in the playing process of fast forwarding and fast rewinding, according to the default broadcast mode corresponding with playing speed, play, i.e. low speed and the corresponding different default broadcast mode of high speed, when low speed, all play and reach smooth effect, also can smooth playing even if exceed the hardware handles ability of playback equipment when high speed.
In a preferred embodiment, as shown in Figure 2, on the basis of the embodiment of above-mentioned Fig. 1, also comprise:
Step S100, generates rapid file according to video file.
As a kind of preferred embodiment, as shown in Figure 3, the step that generates rapid file according to video file comprises:
Step S1001, evenly extracts the frame of video picture in video file, obtains the broadcast information of described frame of video picture;
Step S1002, carries out convergent-divergent and coding processing to described frame of video picture, generates key frame data;
Step S1003, obtains the broadcast information of described key frame according to the broadcast information of described frame of video picture, and according to the big or small generating indexes information of the broadcast information of described key frame and described key frame;
Step S1004, integrates described key frame and described index information, obtains described rapid file.
In the present embodiment, after former video file is decoded, evenly extract the frame of video picture in video file, for example corresponding video file the 1st frame pictures of the 1st frame picture to the 3 frame pictures, the 6th frame picture and the 11st frame picture of rapid file, the like, can reduce the degree of fluctuation of picture, guarantee the smooth excessive of picture; Frame of video picture is carried out to convergent-divergent processing, the size of frame of video picture is dwindled, can reduce its resolution; When frame of video picture is encoded to processing, can adopt the coded system identical with video file, also can adopt different coded systems, in the present embodiment, the frame of video picture extracting is carried out to recompile and can adopt coded system of the prior art to reduce its data volume, repeat no more herein.
Index information comprises the broadcast information of key frame and the size information of key frame, broadcast information comprises reproduction time information and the skew hereof of each key frame, the i.e. position of this key frame, therefore, in concrete implementation process, search with the current step of playing the key frame in the rapid file that t1 is corresponding constantly can be: according to playing t1 and index information search and the current key frame of playing in the rapid file that t1 is corresponding constantly constantly.
In a preferred embodiment, as shown in Figure 4, on the basis of the embodiment of above-mentioned Fig. 1, also comprise:
Step S105, finishes after playing request when receiving fast forwarding and fast rewinding, records current broadcasting t2 constantly, and search and the current frame of video picture of playing the video file that t2 is corresponding constantly;
Step S106, also plays the Picture switch of current broadcasting to the frame of video picture searching.
The present embodiment, outside reaching the smooth playing effect identical with the embodiment of Fig. 1, is also considered to switch back normal accurate switching of playing from the broadcasting of fast forwarding and fast rewinding.
The present embodiment switches back the broadcast mode of fast forwarding and fast rewinding the method for normal broadcast mode and above-mentioned normal broadcast mode is switched to into the method for the broadcast mode of rewind down similar, record current broadcasting t2 constantly, can search in video file and play with front the frame of video picture that t2 is corresponding constantly according to the broadcast information of playing moment t2 and video file, and the Picture switch of current broadcasting to the frame of video picture searching is play.
As shown in Figure 5, one embodiment of the invention proposes a kind of multimedia equipment, comprising:
In the present embodiment, rapid file is evenly to extract frame of video picture in video file and generate in advance, and the frame per second of the frame in this rapid file and resolution are far below frame per second and the resolution of video file, if the frame per second of video file is 25fps (frame is per second), the frame per second of rapid file can be 10fps or lower so, and resolution can be video file video data resolution 1/4 or 1/9, so the data volume of rapid file is less, required memory space is also less.When user's fast forwarding and fast rewinding is play with browsing video content, can play the frame in this rapid file, reach comparatively smooth result of broadcast.
The first search module 102, for searching for and the current key frame of playing the rapid file that t1 is corresponding constantly;
The reproduction time information of the key frame of rapid file is consistent with the reproduction time information of the frame of video picture of video file, but the number of frame is less than video file, if current broadcasting constantly t1 just can be found in rapid file, play so the frame of the moment correspondence from finding, otherwise choose the current t1 frame forward of playing constantly as start frame.Because rapid file is corresponding with the reproduction time information of video file, the quick and precisely location that therefore can also realize video in the playing process of fast forwarding and fast rewinding.
The first search module 102 in the present embodiment, when receiving fast forwarding and fast rewinding playing request, need to record current broadcasting t1 constantly, so that can be play corresponding key frame in the rapid file of t1 search constantly according to this.
The first handover module 103, for by the Picture switch of current broadcasting to picture corresponding to the key frame searching;
Because the reproduction time information of video file is corresponding with the reproduction time information in rapid file, must search and the key frame of playing the rapid file that t1 is corresponding constantly.When searching and playing after the key frame that t1 is corresponding constantly, the first handover module 103 switches to by current video pictures the picture that key frame is corresponding, to carry out F.F. or fast reverse play.
Playing module 104, for obtaining broadcasting speed, plays described key frame data according to the default broadcast mode corresponding with described broadcasting speed.
The present embodiment speed can roughly be divided into high speed and low speed, and definable 2 speeds, 4 speeds and 8 speeds are low speed, and definition 16 speeds and 32 speeds are high speed.Broadcast mode corresponding to default different speed, as while be low speed, can all play the I-frame video data in rapid file, during for high speed, can optionally play the I-frame video data in rapid file, with this, reach the smooth effect of broadcasting.
Particularly, under low speed, in order to make broadcasting pictures as far as possible level and smooth, playing module 104 can be play all key frames in rapid file, for example the frame per second of rapid file is 5fps, can realize 2 speeds by broadcasting 10 frames per second, or broadcasting per second 20 frames is realized 4 speeds etc.Under high speed, even if only play rapid file, also may exceed the disposal ability of multimedia equipment hardware, now need selectivity to play the key frame of rapid file.In a preferred embodiment, the frame per second of supposing rapid file is f, playing speed is t, the fastest broadcasting 25 frames per second of multimedia equipment, the frame number of having play is n1, the frame number that altogether will play is n2, if (n1/n2) < (25/ (f*t)), play this key frame, otherwise, this key frame ignored.If when only playing the key frame of about 1/3 quantity in rapid file and realizing 16 speed, namely only play the 1st key frame, the 4th key frame and the 7th key frame etc., and the like play.Due to playing fluency as preferential demand, can reduce the requirement to multimedia equipment hardware handles ability and the network bandwidth.
In a preferred embodiment, as shown in Figure 6, on the basis of the embodiment of above-mentioned Fig. 5, multimedia equipment also comprises:
As a kind of preferred embodiment, as shown in Figure 7, generation module 100 comprises:
Extracting unit 1001, for evenly extracting the frame of video picture of video file, obtains the broadcast information of described frame of video picture;
The first generation unit 1002, for described frame of video picture being carried out to convergent-divergent and coding processing, generates key frame data;
The second generation unit 1003, for obtain the broadcast information of described key frame according to the broadcast information of described frame of video picture, and according to the big or small generating indexes information of the broadcast information of described key frame and described key frame;
In the present embodiment, after former video file is decoded, extracting unit 1001 evenly extracts the frame of video picture in video file, for example corresponding video file the 1st frame pictures of the 1st frame picture to the 3 frame pictures, the 6th frame picture and the 11st frame picture of rapid file, the like, can reduce the degree of fluctuation of picture, guarantee the smooth excessive of picture; The first 1002 pairs of generation units frame of video picture carries out convergent-divergent processing, the size of frame of video picture is dwindled, and can reduce its resolution; The first 1002 pairs of generation units frame of video picture is encoded while processing, can adopt the coded system identical with video file, also can adopt different coded systems, in the present embodiment, the frame of video picture extracting is carried out to recompile and can adopt coded system of the prior art to reduce its data volume, repeat no more herein.
Index information comprises the broadcast information of key frame and the size information of key frame, broadcast information comprises reproduction time information and the skew hereof of each key frame, the i.e. position of this key frame, therefore, in concrete implementation process, above-mentioned the first search module 102 is specifically for according to playing, moment t1 and index information are searched for and the current key frame of playing in the rapid file that t1 is corresponding constantly.
In a preferred embodiment, as shown in Figure 8, on the basis of the embodiment of above-mentioned Fig. 5, multimedia equipment also comprises:
The second search module 105, for finishing after playing request when receiving fast forwarding and fast rewinding, records current broadcasting t2 constantly, and search and the current frame of video picture of playing the video file that t2 is corresponding constantly;
The second handover module 106, for also playing the Picture switch of current broadcasting to the frame of video picture searching.
The present embodiment, outside reaching the smooth playing effect identical with the embodiment of Fig. 5, is also considered to switch back normal accurate switching of playing from the broadcasting of fast forwarding and fast rewinding.
The broadcast mode of the second handover module 106 fast forwarding and fast rewindings is switched back to normal broadcast mode to the present embodiment and above-mentioned the first handover module 103 switches to into the broadcast mode of rewind down similar by normal broadcast mode, record current broadcasting t2 constantly, can search in video file and play with front the frame of video picture that t2 is corresponding constantly according to the broadcast information of playing moment t2 and video file, and the Picture switch of current broadcasting to the frame of video picture searching is play.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a player method for video, is characterized in that, comprises the following steps:
In the process of playing video file, when receiving fast forwarding and fast rewinding playing request, record current broadcasting t1 constantly, and obtain the rapid file generating in advance;
Search and the current key frame of playing in the rapid file that t1 is corresponding constantly;
By the Picture switch of current broadcasting to picture corresponding to the key frame searching;
Obtain broadcasting speed, according to the default broadcast mode corresponding with described broadcasting speed, play described key frame data.
2. player method according to claim 1, is characterized in that, described in the process of playing video file, when receiving fast forwarding and fast rewinding playing request, records current broadcasting t1 constantly, and comprises before obtaining the step of the rapid file generating in advance:
According to video file, generate rapid file.
3. player method according to claim 2, is characterized in that, the step that generates rapid file according to video file comprises:
Evenly extract the frame of video picture in video file, obtain the broadcast information of described frame of video picture;
Described frame of video picture is carried out to convergent-divergent and coding processing, generate key frame data;
According to the broadcast information of described frame of video picture, obtain the broadcast information of described key frame, and according to the big or small generating indexes information of the broadcast information of described key frame and described key frame;
Integrate described key frame and described index information, obtain described rapid file.
4. player method according to claim 3, is characterized in that, described search comprises with the current step of playing the key frame in the rapid file that t1 is corresponding constantly:
According to playing t1 and the search of described index information and the current key frame of playing in the rapid file that t1 is corresponding constantly constantly.
5. player method according to claim 1, is characterized in that, described method also comprises:
When receiving fast forwarding and fast rewinding, finish after playing request, record current broadcasting t2 constantly, and search and the current frame of video picture of playing the video file that t2 is corresponding constantly;
The Picture switch of current broadcasting to the frame of video picture searching is also play.
6. a multimedia equipment, is characterized in that, comprising:
Acquisition module, for the process at playing video file, when receiving fast forwarding and fast rewinding playing request, records current broadcasting t1 constantly, and obtains the rapid file generating in advance;
The first search module, for searching for and the current key frame of playing the rapid file that t1 is corresponding constantly;
The first handover module, for by the Picture switch of current broadcasting to picture corresponding to the key frame searching;
Playing module, for obtaining broadcasting speed, plays described key frame data according to the default broadcast mode corresponding with described broadcasting speed.
7. multimedia equipment according to claim 6, is characterized in that, described multimedia equipment also comprises generation module, for generating rapid file according to video file.
8. multimedia equipment according to claim 7, is characterized in that, described generation module comprises:
Extracting unit, for evenly extracting the frame of video picture of video file, obtains the broadcast information of described frame of video picture;
The first generation unit, for described frame of video picture being carried out to convergent-divergent and coding processing, generates key frame data;
The second generation unit, for obtain the broadcast information of described key frame according to the broadcast information of described frame of video picture, and according to the big or small generating indexes information of the broadcast information of described key frame and described key frame;
Integral unit, for integrating described key frame and described index information, obtains described rapid file.
9. multimedia equipment according to claim 8, is characterized in that, described the first search module is specifically for according to playing, moment t1 and described index information are searched for and the current key frame of playing in the rapid file that t1 is corresponding constantly.
10. multimedia equipment according to claim 6, is characterized in that, described multimedia equipment also comprises:
The second search module, for finishing after playing request when receiving fast forwarding and fast rewinding, records current broadcasting t2 constantly, and search and the current frame of video picture of playing the video file that t2 is corresponding constantly;
The second handover module, for also playing the Picture switch of current broadcasting to the frame of video picture searching.
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| CN114598912A (en) * | 2022-02-10 | 2022-06-07 | 互影科技（北京）有限公司 | Multimedia file display method and device, storage medium and electronic equipment |
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