CN1556649A - Method of video frequency fast in fast out and normal speed restoring based on in frame coding image searching - Google Patents
Method of video frequency fast in fast out and normal speed restoring based on in frame coding image searching Download PDFInfo
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Abstract
The invention relates to a method for video frequency speeding and backing and speed restoration based on frame coding image searching, which belongs to computer multimedia application technology field. The speed of speeding and backing of the video frequency flow is arranged as the n time speed, stop playing the audio frequency; processing the next frame of the video frequency according to the set speed, thus the speeding and the backing will be delayed, in order to control the speed of speeding or backing. The method is: the playing speed of the video frequency flow is normal; restores the video frequency playing; acquires the next frame of video frequency according to the normal speed; processes the next frame until the whole data are played completely. The view is clear when in speeding and backing, the process is simple, and the speed is stable.
Description
Technical field
The present invention relates to a kind of based on the intraframe coding picture retrieval the video fast forward rewind down and recover the method for Chang Su, belong to the computer media applied technical field, relate in particular to the video playback technical field.
Background technology
The flow process that a common multimedia player playing media file need pass through mainly is: the configuration decoder-read each frame data-select for use suitable decoder decode-display the play.
Because in general the size of audio, video data is very huge, so the compressed encoding/decoding of audio frequency and video also is crucial.So for player,, should select suitable decoder that data are decoded, and then show and play for the media file of different compressed formats.
For motion picture expert group standard (hereinafter to be referred as MPEG) video flowing, it adopts three types image: figure (hereinafter to be referred as the I frame), prognostic chart (hereinafter to be referred as the P frame) and difference complement are bi-directional predicted figure (hereinafter to be referred as the B frame) in the frame.The I frame can provide random-access deposit position, but compression ratio is little, is width of cloth tableaux clearly; The P frame can predict that compression ratio is greater than the I frame by the P frame of I frame or front; The B frame is to predict by previous and follow-up information, so compression effectiveness is the most remarkable.A video flowing sequence can be arranged in the following order along time-axis direction: IBBPBBIBBPBB
Fast forwarding and fast rewinding advances or retreats that frame that is jumped to and must guarantee the frame into I, if what jump to is P frame or B frame, because all depending on the former frame on the sequential, the decoding of P frame and B frame can not decode separately, what the user saw will be a width of cloth mosaic picture, and it is clear just to recover again after jumping to the I frame.From user's demand, obviously mosaic is that the user is difficult to accept most.Therefore, use I frame retrieval technique when fast forwarding and fast rewinding, making new start time point must be the I frame, and what the user saw when just can guarantee to play is width of cloth width of cloth picture clearly.
Fast forwarding and fast rewinding is very important in video Cassette recorder equipped (hereinafter to be referred as a VCR) function, for a multimedia player, realizes that stable fast forwarding and fast rewinding technology fast is the important assurance of meeting consumers' demand.If is not very interested such as the user to current program, then can get on by the other times point that fast forwarding and fast rewinding is leapt to program.This makes the user become more initiatively any part that can select to watch program.Fast forwarding and fast rewinding is a function that often is applied in the multimedia.The fast forwarding and fast rewinding technology that present multimedia player is supported generally is the improvement of carrying out on the basis that drags.The user clicks button No. one time, and F.F. or rewind down regular hour, this time can be set in advance by the user, plays from the next I frame of new time point then, and in fact this be the same with the principle of drag operation.Avoided the randomness that drags like this, made fast forwarding and fast rewinding that the user can be step by step to the time point of wanting to see.But this method also is that certain limitation is arranged:
1, the user can only manual operation step by step make the video fast forward rewind down, and is more loaded down with trivial details.
Though the step-length of 2, advancing can be provided with at every turn, be still changeless in the fast forwarding and fast rewinding process.
3, may miss some key frames, the poor effect that the user browses owing to jump.
4, owing to be manual operation, every one step of jumping all will take a long time fast forwarding and fast rewinding limited speed system.
Summary of the invention
The objective of the invention is to propose a kind of based on the intraframe coding picture retrieval the video fast forward rewind down and recover the method for Chang Su, utilize the video playback technology in the existing computer, problems such as complex operation in the automatic fast forwarding and fast rewinding when solving video playback, step-length are fixing, the VCR function of the automatic fast forwarding and fast rewinding of play multimedia files is provided to the user, utilize I frame retrieval technique to improve the effect of fast forwarding and fast rewinding, to improve the visual effect of user's browsing video.
The method based on the video fast forward rewind down of intraframe coding picture retrieval that the present invention proposes may further comprise the steps:
(1) F.F. in the setting video stream or rewind down speed are doubly speed of n, promptly jump n I frame forward or backward at every turn;
(2) stop audio plays;
(3) according to the F.F. or the rewind down speed of above-mentioned setting, judge whether the video next frame that obtains is the I frame, if not the I frame then carries out following steps (4), if, then the I frame counter is added 1, and judge whether the I frame count arrives the multiple n of setting, if arrive, carry out following steps (6), if do not arrive, then carry out following steps (4);
(4) if the F.F. state then jumps to back one frame of video, if the rewind down state, the last frame of video of rebound then, and return step (3);
(5) F.F. or rewind down are postponed, with the speed of control F.F. or rewind down;
(6) I-frame video that retrieves in the step (3) is decoded, and show this frame data;
(7) repeat above-mentioned steps (3)～(6), to realize the automatic F.F. or the rewind down of all videos.
In the said method, the method for control F.F. or rewind down speed may further comprise the steps:
(1) video is jumped after the frame forward or backward, the time of utilizing following formula calculating that F.F. or rewind down are postponed:
Delay time=(maximum hopping time-this I frame-skip time+C1) * the maximum video time of C2/,
In the following formula, C1, C2 are respectively two time constants identical or inequality;
(2) delay time of aforementioned calculation is judged, if surpass this I frame-skip time, then will be set as this I frame-skip time time of delay, if do not surpass this I frame-skip time, the delay time of then keeping calculating is constant.
The method based on the video recovery Chang Su of intraframe coding picture retrieval that the present invention proposes may further comprise the steps:
(1) broadcasting speed in the setting video stream is a normal speed;
(2) recover audio plays;
(3), obtain the next frame video according to above-mentioned normal speed;
(4) the next frame video is decoded,, when reproduction time arrives, play this data decoded storage;
(5) repeating step (3) and (4) are until playing all data.
The present invention propose based on the video fast forward rewind down of intraframe coding picture retrieval and recover the method for Chang Su, its advantage is:
1, video pictures is clear during fast forwarding and fast rewinding, does not have mosaic.
2, the algorithm of control of video fast forwarding and fast rewinding speed is simple, and computation complexity is little, and computing is quick.
3, the fast forwarding and fast rewinding velocity-stabilization of video, and speed can change fast with the video length self adaptation.
4, the user can be according to the needs of oneself, by configuration parameter, and the fast forwarding and fast rewinding speed of control of video.
5, the inventive method is not only applicable to local multimedia file, simultaneously also can expanded application in long-range VOD program request.
6, the user's fast forwarding and fast rewinding function that can utilize the inventive method to provide is carried out fast browsing to video frequency program.
Description of drawings
Fig. 1 is the FB(flow block) of the automatic fast forwarding and fast rewinding of the present invention's proposition.
Fig. 2 is the FB(flow block) of the recovery normal speed forward of the present invention's proposition.
Embodiment
The method based on the video fast forward rewind down of intraframe coding picture retrieval that the present invention proposes, its flow process be as shown in Figure 1:
(1) F.F. in the setting video stream or rewind down speed are doubly speed of n, promptly jump n I frame forward or backward at every turn;
(2) stop audio plays;
(3) according to the F.F. or the rewind down speed of above-mentioned setting, judge whether the video next frame that obtains is the I frame, if not the I frame then carries out following steps (4), if, then the I frame counter is added 1, and judge whether the I frame count arrives the multiple n of setting, if arrive, carry out following steps (6), if do not arrive, then carry out following steps (4);
(4) if the F.F. state then jumps to back one frame of video, if the rewind down state, the last frame of video of rebound then, and return step (3);
(5) F.F. or rewind down are postponed, with the speed of control F.F. or rewind down;
(6) I-frame video that retrieves in the step (3) is decoded, and show this frame data;
(7) repeat above-mentioned steps (3)～(6), to realize the automatic F.F. or the rewind down of all videos.
In the said method, the method for control F.F. or rewind down speed, at first video is jumped after the frame forward or backward, the time of utilizing following formula calculating that F.F. or rewind down are postponed:
Delay time=(maximum hopping time-this I frame-skip time+C1) * the maximum video time of C2/,
In the following formula, C1, C2 are respectively two time constants identical or inequality;
Then the delay time of aforementioned calculation is judged, if surpass this I frame-skip time, then will be set as this I frame-skip time time of delay, if do not surpass this I frame-skip time, the delay time of then keeping calculating is constant.
The method that the present invention proposes based on the video recovery Chang Su of intraframe coding picture retrieval, its flow process may further comprise the steps as shown in Figure 2:
(1) broadcasting speed in the setting video stream is a normal speed;
(2) recover audio plays;
(3), obtain the next frame video according to above-mentioned normal speed;
(4) the next frame video is decoded,, when reproduction time arrives, play this data decoded storage;
(5) repeating step (3) and (4) are until playing all data.
The invention provides and a kind ofly automatically retrieve the I frame forward backward and use to the user in the fast forwarding and fast rewinding mode that I interframe is jumped.After the user clicks fast forwarding and fast rewinding button, program bounds forward on the I frame automatically or retreats, make the user can browse program easily, and also make program fast fast forwarding and fast rewinding to new time point, after browsing to the Pgmtime point of oneself wanting to see up to the user, can recover normal play at any time, watch.For this mode, the user also can select different fast forwarding and fast rewinding speed according to the demand of self.This method is applied to computer media plays, can satisfy the more demand of user.We must use the technology of retrieval I frame in fast forwarding and fast rewinding.
Automatically fast forwarding and fast rewinding is by carrying out forward continuous jump backward between the I frame, realizing the function of fast forwarding and fast rewinding.N I frame shows once owing to can set at interval, but the interval of each I interframe is again indefinite, so n I frame shows n times that does not once just equal normal playback speed.Can only be similar to every interval n I frame of definition shows once as the doubly fast fast forwarding and fast rewinding of n for this reason.The user clicks a F.F. (rewind down) button on the basis of n times of F.F. (rewind down), then F.F. (rewind down) speed increases to n+1 doubly; Click a rewind down (F.F.) button on the basis of n times of F.F. (rewind down), then F.F. (rewind down) speed is kept to n-1 doubly.
During fast forwarding and fast rewinding was handled, audio frequency did not need fast forwarding and fast rewinding, still by the normal speed decoding, but do not play back be arranged to quiet.
During fast forwarding and fast rewinding is handled, because therefore a displaying video will not carry out audio-visual synchronization and handle.In addition, just often decoding back decoded data need be buffered to play constantly and show, but fast forwarding and fast rewinding handles not according to normal speed, and buffering shows that again speed of displaying then can lag far behind the speed of fast forwarding and fast rewinding, therefore, must show after the decoding immediately by the time.
The user after browsing to the time point of oneself wanting to see, can select to recover normal speed and play in the fast forwarding and fast rewinding process.This can be by clicking broadcast button or with the button of current fast forwarding and fast rewinding opposite states fast forwarding and fast rewinding speed being reduced to 0 by click and realize.
In automatic fast forwarding and fast rewinding method, if delay is not set, jumps in I interframe fast continuously and retrieve, what then the speed of fast forwarding and fast rewinding can be suitable is fast, and the user can have little time to browse to each the I frame that shows.Therefore need postpone the regular hour after finding the I frame shows again.If but were set as fixingly during this period of time, then could satisfy the program of different length simultaneously.For example this section is longer time of delay, for the program of length, the user is waited for for a long time.If time of delay is shorter, for the program of shorter length, the user also is not able to do in time just can browse very soon to finish.Therefore, need consider actual movie length during the time at control lag.The time of each I frame-skip neither be changeless in addition, and two I interFrameGaps are very little sometimes, once just jumped to; Sometimes but quite far away at interval, need just to jump to for a long time.This can be inconsistent to the speed that the user causes picture to jump.For this reason, the strategy that the inventive method is taked is, if the overlong time of this jump, next the time of Yan Chiing just short as far as possible, feasible maintaining total time in the stable time range of jump+delay at every turn.That gives the user like this feels to be exactly that picture is with more stable speed fast forwarding and fast rewinding.For this reason, the algorithm of being taked is as follows:
Definition:
Maxtime: maximum movie length.Unit second
Max_skiptime: maximum hopping time, the unit millisecond, being made as 10000 milliseconds here is 10 seconds
Skiptime: this I frame-skip time, promptly the current I frame is with the blanking time between the last shown I frame.If this time then handled as 10 seconds greater than (max_skiptime) 10 seconds.The unit millisecond
Delay: the time of delay of required calculating.The unit millisecond
Algorithm:
Delay=(max_skiptime-skiptime+C1) * C2/maxtime); C1, C2 are constant, all get here and do 1000.
If movie program is too short, might cause like this that delay's is chronic, even surpassed real time of each jump, so just lost the meaning of fast forwarding and fast rewinding, if therefore the time that postpones has surpassed the time of jumping, just be set as the time interval of two interframe actual play the time that postpones, as the delay of maximum.As follows:
if(delay＞skiptime)
delay＝skiptime；
The principle of institute of the present invention foundation is retrieval and the demonstration to the I frame.This is to utilize that the user is desirable would rather to see that a static picture clearly also is unwilling to see the mosaic of a period of time.For this reason, when fast forwarding and fast rewinding, utilize the I frame to retrieve, make that each frame that shows all is the I frame, so just can avoid the picture of mosaic as the characteristic of key frame.
Introduce one embodiment of the present of invention below:
Present embodiment is finished by playing local mp4 media file, and all operations is all finished by player.
Player configurations
CPU：Intel?PIII?800MHz
Internal memory: 256M
Operating system: Windows2000Professional
Player: LSMP Media Player
Parameter is provided with
Broadcast program: mummy750a128.mp4 (film)
Video length: 7483191 milliseconds
The player fast forwarding and fast rewinding implementation method of present embodiment only needs the user to click corresponding fast forwarding and fast rewinding button on the interface and gets final product.
Present embodiment realizes that the concrete test data of the method for automatic fast forwarding and fast rewinding is as follows:
| F.F. | Rewind down | ||
| Setting speed | 1 | Setting speed | 1 |
| The video last frame time (ms) before the F.F. | 2641820 | The video last frame time (ms) before the rewind down | 5333680 |
| The audio frequency last frame time (ms) before the F.F. | 2641989 | The audio frequency last frame time (ms) before the rewind down | 5333786 |
| The I frame number of jumping | 6 | The I frame number of jumping | 6 |
| Recover rear video first frame time (ms) | 2684229 | Recover rear video first frame time (ms) | 5321837 |
| (ms) spent total time in frame-skipping | 1613 | Frame-skipping take time (ms) | 310 |
| Postpone institute and spend total time (ms) | 2304 | Postpone institute and spend total time (ms) | 6315 |
| (ms) spent total time in F.F. | 4507 | Rewind down is spent total time (ms) | 7140 |
The data of each I frame-skip are as follows:
F.F.:
| Number of skips | ????1 | ????2 | ????3 | ????4 | ????5 | ????6 |
| Skip the time (ms) | ????9716 | ????＞10000 | ????＞10000 | ????4253 | ????6047 | ????8716 |
| The frame-skipping time (ms) | ????381 | ????361 | ????250 | ????140 | ????241 | ????240 |
| Time of delay (ms) | ????171 | ????133 | ????133 | ????901 | ????661 | ????305 |
| Total time (ms) | ????552 | ????494 | ????383 | ????1041 | ????902 | ????545 |
Rewind down:
| Number of skips | ????1 | ????2 | ????3 | ????4 | ????5 | ????6 |
| Skip the time (ms) | ????2835 | ????1876 | ????3086 | ????2668 | ????1126 | ????709 |
| The frame-skipping time (ms) | ????10 | ????50 | ????110 | ????80 | ????30 | ????30 |
| Time of delay (ms) | ????1091 | ????1219 | ????1057 | ????11?13 | ????1126 | ????709 |
| Total time (ms) | ????1101 | ????1269 | ????1167 | ????1193 | ????1156 | ????739 |
From top data as can be seen:
Because the effect that postpones has guaranteed that the speed of fast forwarding and fast rewinding can be not too fast on the one hand, makes speed average on the other hand,, will more be tending towards total time average like this because the few more delay of frame-skipping time is generally big more.
In addition, can see that when rewind down is handled two I interFrameGaps are very little, the delay that calculate this moment is also bigger, and this makes total generally speaking hopping time probably can remain on about 1 second.The user also can receive visual effect preferably.
Since frame-skipping fast, general total time is still little a lot of than the time of skipping, unless the time of skipping is very little, make the computing relay time less than the time of skipping (as rewind down 5,6), but owing to added protection, it is a lot of to make total time can not be bigger than the time of skipping.
Claims (3)
1, a kind of method of the video fast forward rewind down based on the intraframe coding picture retrieval is characterized in that this method may further comprise the steps:
(1) F.F. in the setting video stream or rewind down speed are doubly speed of n, promptly jump n I frame forward or backward at every turn;
(2) stop audio plays;
(3) according to the F.F. or the rewind down speed of above-mentioned setting, judge whether the video next frame that obtains is the I frame, if not the I frame then carries out following steps (4), if, then the I frame counter is added 1, and judge whether the I frame count arrives the multiple n of setting, if arrive, carry out following steps (6), if do not arrive, then carry out following steps (4);
(4) if the F.F. state then jumps to back one frame of video, if the rewind down state, the last frame of video of rebound then, and return step (3);
(5) F.F. or rewind down are postponed, with the speed of control F.F. or rewind down;
(6) I-frame video that retrieves in the step (3) is decoded, and show this frame data;
(7) repeat above-mentioned steps (3)～(6), to realize the automatic F.F. or the rewind down of all videos.
2, the method for claim 1 is characterized in that, the method for control F.F. or rewind down speed may further comprise the steps in the step (5):
(1) video is jumped after the frame forward or backward, the time of utilizing following formula calculating that F.F. or rewind down are postponed:
Delay time=(maximum hopping time-this I frame-skip time+C1) * the maximum video time of C2/, in the following formula, C1, C2 are respectively two time constants identical or inequality;
(2) delay time of aforementioned calculation is judged, if surpass this I frame-skip time, then will be set as this I frame-skip time time of delay, if do not surpass this I frame-skip time, the delay time of then keeping calculating is constant.
3, the method for a kind of video recovery Chang Su based on the intraframe coding picture retrieval is characterized in that this method may further comprise the steps:
(1) broadcasting speed in the setting video stream is a normal speed;
(2) recover audio plays;
(3), obtain the next frame video according to above-mentioned normal speed;
(4) the next frame video is decoded,, when reproduction time arrives, play this data decoded storage;
(5) repeating step (3) and (4) are until playing all data.
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| CN1897696B (en) * | 2005-07-15 | 2010-05-12 | Lg电子株式会社 | Method of reproducing transport stream in television receiver and television receiver using the same |
| CN101262600B (en) * | 2007-03-08 | 2010-05-26 | 凌阳科技股份有限公司 | A quick forward and backward playing system and method for network video |
| CN101179704B (en) * | 2007-11-23 | 2010-07-21 | 华为终端有限公司 | Program content positioning method and program content positioning device |
| CN101795382A (en) * | 2010-04-01 | 2010-08-04 | 广东欧珀电子工业有限公司 | Method for controlling image fast forward speed and fast backward speed |
| CN101841692A (en) * | 2010-04-23 | 2010-09-22 | 深圳市茁壮网络股份有限公司 | Method for fast forwarding and fast rewinding video stream |
| CN101635847B (en) * | 2009-09-02 | 2011-11-30 | 中兴通讯股份有限公司 | Transmission method, video display device and terminal of streaming media |
| CN102469309A (en) * | 2010-11-16 | 2012-05-23 | 扬智科技股份有限公司 | Image processing method |
| CN102522097A (en) * | 2012-01-06 | 2012-06-27 | 顾宁 | Method for accurately controlling progress of player on touch type equipment and player |
| US8311399B2 (en) | 2007-02-08 | 2012-11-13 | Huawei Technologies Co., Ltd. | Method for fast forward/backward play of video data and a streaming server |
| CN102789799A (en) * | 2006-12-22 | 2012-11-21 | 苹果公司 | Two-dimensional timeline display of media items |
| CN104284249A (en) * | 2013-07-11 | 2015-01-14 | 腾讯科技（深圳）有限公司 | Video playing method and device |
| CN106331871A (en) * | 2015-07-08 | 2017-01-11 | 阿里巴巴集团控股有限公司 | Method and device for realizing fast-forward or fast-backward playback of video stream |
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| CN1897696B (en) * | 2005-07-15 | 2010-05-12 | Lg电子株式会社 | Method of reproducing transport stream in television receiver and television receiver using the same |
| CN102789799A (en) * | 2006-12-22 | 2012-11-21 | 苹果公司 | Two-dimensional timeline display of media items |
| US8311399B2 (en) | 2007-02-08 | 2012-11-13 | Huawei Technologies Co., Ltd. | Method for fast forward/backward play of video data and a streaming server |
| CN101262600B (en) * | 2007-03-08 | 2010-05-26 | 凌阳科技股份有限公司 | A quick forward and backward playing system and method for network video |
| CN101179704B (en) * | 2007-11-23 | 2010-07-21 | 华为终端有限公司 | Program content positioning method and program content positioning device |
| CN101635847B (en) * | 2009-09-02 | 2011-11-30 | 中兴通讯股份有限公司 | Transmission method, video display device and terminal of streaming media |
| CN101795382A (en) * | 2010-04-01 | 2010-08-04 | 广东欧珀电子工业有限公司 | Method for controlling image fast forward speed and fast backward speed |
| CN101841692A (en) * | 2010-04-23 | 2010-09-22 | 深圳市茁壮网络股份有限公司 | Method for fast forwarding and fast rewinding video stream |
| CN101841692B (en) * | 2010-04-23 | 2011-11-23 | 深圳市茁壮网络股份有限公司 | Method for fast forwarding and fast rewinding video stream |
| CN102469309B (en) * | 2010-11-16 | 2014-03-12 | 扬智科技股份有限公司 | Image processing method |
| CN102469309A (en) * | 2010-11-16 | 2012-05-23 | 扬智科技股份有限公司 | Image processing method |
| CN102522097A (en) * | 2012-01-06 | 2012-06-27 | 顾宁 | Method for accurately controlling progress of player on touch type equipment and player |
| CN104284249A (en) * | 2013-07-11 | 2015-01-14 | 腾讯科技（深圳）有限公司 | Video playing method and device |
| CN106331871A (en) * | 2015-07-08 | 2017-01-11 | 阿里巴巴集团控股有限公司 | Method and device for realizing fast-forward or fast-backward playback of video stream |
| CN106331871B (en) * | 2015-07-08 | 2020-01-17 | 阿里巴巴集团控股有限公司 | Method and device for realizing fast forward or fast backward of video stream |
| CN107438196A (en) * | 2016-05-25 | 2017-12-05 | 安讯士有限公司 | Method and apparatus for playing recorded video |
| CN107438196B (en) * | 2016-05-25 | 2019-09-13 | 安讯士有限公司 | Method and apparatus for playing recorded video |
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