CN104080013A - Special-effect playing method and device - Google Patents
Special-effect playing method and device Download PDFInfo
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Abstract
The invention provides a special-effect playing method and device. The method comprises the steps that a special-effect playing request input by a user for a video source is received, wherein the request carries a special-effect playing multiple, and a video source file only comprises a common video stream; according to the current moment, the common video stream in the video source file is searched for a corresponding special-effect playing starting video clip; the starting video clip is downloaded at first; after downloading of one video clip is finished, frames I are extracted from the downloaded current video clip; the copy number of the frames I is calculated, each extracted frame I is copied according to the calculated copy number, and a current special-effect clip corresponding to the current video clip is obtained; according to the special-effect playing multiple, the PTS value of each frame I in the current special-effect clip is updated, and the current special-effect clip is sent to a player. The special-effect playing method and device still support special-effect playing even though no special-effect streams are provided in the video source file.
Description
Technical field
The application relates to Technology of Multimedia Stream Playing field, relates in particular to special effect play method and device.
Background technology
At present, in each network standard agreement, provided the implementation method of specific Streaming Media special effect play, but for practical application, these implementation methods has limitation.With HTTP (Hyper-Text Transfer Protocol, HTML (Hypertext Markup Language)) adaptive video stream technology is example, the special effect play of the existing HTTP adaptive video stream technology video source that only support package flows containing special efficacy (trick), and at 3GPP (3rd Generation Partnership Project, third generation partner program) and DASH (Dynamic Adaptive Streaming over HTTP, dynamic self-adapting stream based on HTTP) in agreement, provided relevant MPD (Media Presentation Description, media content description) explanation, at OIPF (Open IPTV forum, opening Internet Protocol Television forum) in agreement, provided the concrete grammar of realizing.
MPD is the data format of a kind of XML (eXtensible Mark Language, extend markup language) of standard of the DASH of meeting agreement.MPD is according to DASH agreement, one large section of video file is divided into very little video segment (Segment), then by its URL (Uniform Resource Locator, URL(uniform resource locator)) information is kept in segment nodes for client-access server, and the fragment of the played in order of the rate bit stream with identical is placed in same Representation (statement) element, according to different bandwidth, carry out code stream switching.Wherein, in Representation element, whether comprise maxPlayoutRate and in order to the content of multimedia that represents this element and shine upon, whether support the special effect play technology of fast forwarding and fast rewinding.Below provided the fragment of the MPD that comprises special efficacy (trick) stream video source:
Above-mentioned MPD shows current source support special effect play, supports that the special efficacy stream of special effect play is the media file that only comprises key frame, and key frame wherein can be used as the reference point of random access, also can be used as the unit data of imaging separately.Can whether support special efficacy to spread to put by MPD being resolved to analyze shone upon media file, when receiving the request of fast forwarding and fast rewinding play operation, can download the special efficacy stream of corresponding period, and its timestamp is processed, thereby generate the video flowing that meets special effect play operation requirements.
The special effect play implementation method that above-mentioned standard agreement provides exists following not enough:
1, depend on special efficacy stream.In the MPD file providing, special efficacy flows out wrongly, or while not providing special efficacy stream, special effect play just cannot realize, but for video playback, special effect play is again more basic operation, and limitation is just very large like this;
2, higher to bandwidth requirement.For different fast forwarding and fast rewinding requirements, part downloads of media file, has wasted bandwidth resources selectively, has reduced treatment effeciency.
Summary of the invention
The application provides special effect play method and device, not provide special efficacy when stream to realize special effect play in video source file.
The application's technical scheme is achieved in that
A special effect play method, the method comprises:
Receive the special effect play request for a video source of user's input, in this request, carry special effect play multiple, in described video source file, only comprise ordinary video stream;
According to current time, in the ordinary video stream of video source file, find the initial video segment of corresponding special effect play;
From initial video segment, start to download;
After having downloaded a video segment, from the current video fragment of downloading, extract crucial I frame;
The quantity that copies of calculating I frame, according to the quantity that copies calculating, copies respectively each the I frame extracting, and obtains current special efficacy fragment corresponding to current video fragment;
According to special effect play multiple, upgrade the displaying time stamp pts value of each I frame in current special efficacy fragment, current special efficacy fragment is sent to player.
After finding the initial video segment of corresponding special effect play in the described ordinary video at video source file stream, further comprised before initial video segment starts to download:
Calculate the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream;
Judge whether this ratio is greater than preset value, if so, determine and all download; Otherwise, determine and carry out part download;
Described from initial video segment, start to download be:
Whole downloads or part downloading mode according to determining, start to download from initial video segment.
In this ordinary video stream of described calculating, before the duration of each video segment and the ratio of special effect play multiple, further comprise:
Judge whether current network bandwidth is not less than the proposed bandwidth of described ordinary video stream, if so, carry out the action of the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream of described calculating; Otherwise, determine and carry out part download.
While comprising a plurality of ordinary video stream in described video source file,
The initial video segment that finds corresponding special effect play in the described stream of the ordinary video at video source file is:
In video source file, the ordinary video of option code flow rate minimum flows, and finds the initial video segment of corresponding special effect play in selected ordinary video stream.
The quantity that copies of described calculating I frame is:
When downloading mode is while all downloading, I frame copy quantity=frame frequency * (length of special effect play multiple/picture group GOP);
When downloading mode is for part is when download, I frame copy quantity=frame frequency * (duration/special effect play multiple of current video fragment).
In the current special efficacy fragment of described renewal, the pts value of each I frame comprises:
According to following formula, upgrade the pts value of each I frame in current special efficacy fragment:
The sequence number of pts value=(the video time scale/frame frequency of described ordinary video stream) * I frame
Wherein, the sequence number of I frame refers to the sequence number of I frame in whole special efficacy stream.
Described ordinary video stream is the fMp4 video flowing based on HTML (Hypertext Markup Language) HTTP adaptive video stream.
Described current special efficacy fragment sent to after player and further comprised:
For each the I frame in current special efficacy fragment, player calculates the actual play moment t of this I frame according to following formula:
T=t
0+ (currentPTS-firstPTS) * special effect play multiple
Wherein, currentPTS is the pts value of current I frame, and firstPTS value is the pts value of first I frame in special efficacy stream, t
0for the actual play moment of first I frame in special efficacy stream.
A special effect play device, this device comprises:
Download module: receive the special effect play request for a video source of user's input, carry special effect play multiple in this request, only comprise ordinary video stream in described video source file; According to current time, in the ordinary video stream of video source file, find the initial video segment of corresponding special effect play; From initial video segment, start to download;
I frame abstraction module: when download module has been downloaded after a video segment, extract crucial I frame from the current video fragment of downloading;
Special efficacy stream generation module: calculate the quantity that copies of I frame, according to the quantity that copies calculating, each I frame that I frame abstraction module is extracted copies respectively, obtains current special efficacy fragment corresponding to current video fragment; According to special effect play multiple, upgrade the displaying time stamp pts value of each I frame in current special efficacy fragment, current special efficacy fragment is sent to player.
After described download module finds the initial video segment of corresponding special effect play in the ordinary video stream of video source file, further comprised before initial video segment starts to download:
Calculate the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream;
Judge whether this ratio is greater than preset value, if so, determine and all download; Otherwise, determine and carry out part download;
Described download module starts to download from initial video segment:
Whole downloads or part downloading mode according to determining, start to download from initial video segment.
During flowing, this ordinary video of calculating described download module further comprises before the duration of each video segment and the ratio of special effect play multiple:
Judge whether current network bandwidth is not less than the proposed bandwidth of described ordinary video stream, if so, carry out the action of the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream of described calculating; Otherwise, determine and carry out part download.
While comprising a plurality of ordinary video stream in described video source file,
The initial video segment that described download module finds corresponding special effect play in the ordinary video stream of video source file is:
In video source file, the ordinary video of option code flow rate minimum flows, and finds the initial video segment of corresponding special effect play in selected ordinary video stream.
Visible, in the application, when special efficacy stream is not provided in video source file, by ordinary video stream being carried out to key-frame extraction and copying generation special efficacy and flow, thereby realized special effect play.
Accompanying drawing explanation
The special effect play method flow diagram that Fig. 1 provides for the embodiment of the present application;
Fig. 2 is the box structural representation of the Fragment in fMp4 file;
The composition schematic diagram of the special effect play device that Fig. 3 provides for the embodiment of the present application.
Embodiment
The special effect play method flow diagram that Fig. 1 provides for the embodiment of the present application, its concrete steps are as follows:
Step 101: receive the special effect play request for a video source of user's input, carry special effect play multiple in this request.
Special effect play is as F.F. or fast reverse play.
The value of special effect play multiple is generally 2
n, n is more than or equal to 1 integer, as: 2 times, 4 times, 8 times, 16 times ...
Step 102: according to current time, find the initial video segment (Segment) of corresponding special effect play in the ordinary video stream of video source file.
Ordinary video stream refers to and comprises I, B, P frame video flowing that can normal speed forward, and special efficacy (trick) stream refers to and only comprises I frame and can be for the special flow of F.F. or fast reverse operation.
Consider in video source file and may both comprise ordinary video stream, also comprise special efficacy stream; Meanwhile, when comprising ordinary video stream, may comprise the different a plurality of ordinary video streams of rate bit stream.Therefore,, when specific implementation, this step 102 can specifically comprise:
Step 1021: judge in video source file whether comprise special efficacy stream, if not, execution step 1022.
If comprise special efficacy stream in video source file, play-over this special efficacy stream.
Step 1022: judge in video source file whether comprise a plurality of ordinary video stream, if so, perform step 1023; Otherwise, execution step 1024.
Step 1023: the video flowing of option code flow rate minimum in the plurality of ordinary video stream, goes to step 1025.
Step 1024: directly select an ordinary video stream unique in video source file, execution step 1025.
Step 1025: in the ordinary video stream of selecting, find the initial video segment (Segment) of corresponding special effect play according to current time.
Step 103: obtain the duration of each video segment in ordinary video stream, calculate the ratio of this duration and special effect play multiple.
In ordinary video stream, the duration of each video segment is identical.
When video source file is fMp4 file, the duration attribute the MPD that can flow from ordinary video obtains the duration of each video segment, and conventionally, the duration of video segment be take second (s) as unit.
Step 104: judge that whether this ratio is greater than preset value, if so, performs step 105; Otherwise, execution step 106.
Preset value can rule of thumb be set.
Step 105: determine ordinary video stream is started all to download from initial video segment, go to step 107.
Step 106: determine ordinary video stream is started to carry out part download from initial video segment, execution step 107.
Video segment space-number in the time of can presetting part download, for example: if intervals of video number is m (m is integer and m >=1), while downloading, every m video segment, download a video segment.
In actual applications, also can consider current network bandwidth, now, in step 103, in obtaining ordinary video stream, before the duration of each video segment, further comprise:
Judge that whether current network bandwidth is not less than the proposed bandwidth of current ordinary video stream, if so, carries out the action of obtaining the duration of each video segment in ordinary video stream; Otherwise, determine and carry out part download.
Step 107: according to definite downloading mode, start all to download or part download from the initial video segment of ordinary video stream.
After having downloaded a video segment, carry out following steps 108～111.
Step 108: extract key frame from the current video fragment of downloading, i.e. I frame.
Step 109: according to special effect play multiple, calculate the quantity that copies of I frame, according to the quantity that copies calculating, each the I frame extracting is copied respectively, obtain current special efficacy fragment corresponding to current video fragment.
If downloading mode is whole downloads, can determine according to following formula the quantity that copies of I frame:
I frame copy quantity=frame frequency * (length of special effect play multiple/GOP);
If downloading mode is part, download, can determine according to following formula the quantity that copies of I frame:
I frame copy quantity=frame frequency * (duration/special effect play multiple of current video fragment).
Frame frequency refers to the quantity of the frame of demonstration per second, is conventionally fixed as 24fps (frame/second).GOP is picture group (Group of Pictures), and the length of GOP refers to the quantity of the frame in the current video fragment of download.
Step 110: for each the I frame in current special efficacy fragment, recalculate PTS (Presentation Time Stamp, the displaying time stamp) value of this I frame, with the pts value calculating, upgrade the former pts value in this I frame, upgrade completely, current special efficacy fragment is sent to player.
Step 111: player receives after current special efficacy fragment, for each I frame, according to the pts value of this I frame and special effect play multiple, calculates the actual play of this I frame constantly, in this actual play, constantly plays this I frame.
According to following formula, upgrade the pts value of each I frame in current special efficacy fragment:
The sequence number of pts value=(timescale/ frame frequency) * I frame
Wherein, timescale is the video time scale of ordinary video stream; The sequence number of I frame refers to the sequence number of I frame in whole special efficacy stream, for example, establishes special efficacy stream and comprises successively: special efficacy fragment 1, special efficacy fragment 2, special efficacy fragment 3 ...., wherein, special efficacy fragment 1 comprises m
1individual I frame, sequence number be followed successively by 1,2,3 ..., m
1-1, m
1, special efficacy fragment 2 comprises m
2individual I frame, sequence number is followed successively by m
1+ 1, m
1+ 2, m
1+ 3 ..., m
1+ m
2-1, m
1+ m
2.
Player calculates the actual play moment t of each I frame according to following formula:
T=t
0+ (currentPTS-firstPTS) * special effect play multiple
Wherein, currentPTS is the pts value of current I frame, and firstPTS value is the pts value (being the pts value of first I frame in initial special efficacy fragment) of first I frame in special efficacy stream, t
0for the actual play moment of first I frame in special efficacy stream, first after the namely broadcasting of the last frame of the video flowing of normal play constantly constantly of the actual play of first I frame constantly.
The form of the video source file in the embodiment of the present application can be the fMp4 based on HTTP adaptive video stream technology.
The elementary cell of fMp4 file is " box ", and box both can comprise data, also can comprise metadata.For special effect play, the box of most critical is Track Fragment (traf flows sub-fragment) and Media Data (mdat), and the former has deposited the information set of frame of video, be number, size, the Data Position information of frame of video, and the latter has deposited the data of actual video frame.Box by analytical analysis fMp4 file can extract I frame.
Fig. 2 has provided the box structure of the Fragment in fMp4 file, wherein, a Fragment is comprised of one " moof " and one " mdat ", a fragment comprises a video track or audio track, and comprises enough metadata and can decode separately to guarantee this part data.For video track, in trun box, depositing size, the positional information of each video requency frame data, and in mdat box, depositing actual video requency frame data.Wherein, each Segment is comprised of one or more Fragment.
Take video source file below as fMP4 file is example, provide the process that I frame extracts:
Step 01: finding medium type in fMP4 file is the track of video (video).
Particularly, be in Traf, to find track.hdlr='vide'.
Step 02: resolve the trun box of video track, determine the position that current fragment data start, and the size of each frame, calculate the frame number that this fragment comprises, and determine the position of every frame data.
Step 03: for every frame data, judge according to the picture_coding_type field in Mdat whether this frame is I frame, if so, extract; Otherwise, do not extract.
From above-described embodiment, can find out, the application's tool has the following advantages:
1, in video source file, lack in the situation of special efficacy (trick) stream of supporting special effect play, can be by the download of ordinary video stream, I frame be extracted, copy to produce special efficacy and flow, also can support special effect play when lacking special efficacy stream video source file.
2, can be according to the special effect play multiple of current network bandwidth and user's selection, selectively ordinary video stream is carried out to all or part of download, guaranteeing under the prerequisite that higher user experiences, improve download efficiency and reduced processing complexity, saved the consumption of CPU and taking of memory.
The composition schematic diagram of the special effect play device that Fig. 3 provides for the embodiment of the present application, this device mainly comprises: download module, I frame abstraction module and special efficacy stream generation module, wherein:
Download module: receive the special effect play request for a video source of user's input, carry special effect play multiple in this request, only comprise ordinary video stream in described video source file; According to current time, in the ordinary video stream of video source file, find the initial video segment of corresponding special effect play; From initial video segment, start to download.
I frame abstraction module: when download module has been downloaded after a video segment, extract crucial I frame from the current video fragment of downloading.
Special efficacy stream generation module: calculate the quantity that copies of I frame, according to the quantity that copies calculating, each I frame that I frame abstraction module is extracted copies respectively, obtains current special efficacy fragment corresponding to current video fragment; According to special effect play multiple, upgrade the displaying time stamp pts value of each I frame in current special efficacy fragment, current special efficacy fragment is sent to player.
Wherein, after download module finds the initial video segment of corresponding special effect play in the ordinary video stream of video source file, before starting from initial video segment to download, further comprise: calculate the duration of each video segment and the ratio of special effect play multiple this ordinary video stream; Judge whether this ratio is greater than preset value, if so, determine and all download; Otherwise, determine and carry out part download;
And download module starts to download from initial video segment and is: whole downloads or part downloading mode according to determining, start to download from initial video segment.
Wherein, during flowing, this ordinary video of calculating download module further comprises before the duration of each video segment and the ratio of special effect play multiple: judge whether current network bandwidth is not less than the proposed bandwidth of described ordinary video stream, if so, carry out the action of the duration of each video segment and the ratio of special effect play multiple in this ordinary video of described calculating stream; Otherwise, determine and carry out part download.
Wherein, while comprising a plurality of ordinary video stream in video source file, the initial video segment that download module finds corresponding special effect play in the ordinary video stream of video source file is: in video source file, the ordinary video of option code flow rate minimum flows, and finds the initial video segment of corresponding special effect play in selected ordinary video stream.
Wherein, the quantity that copies of special efficacy stream generation module calculating I frame is:
When downloading mode is while all downloading, I frame copy quantity=frame frequency * (length of special effect play multiple/GOP);
When downloading mode is for part is when download, I frame copy quantity=frame frequency * (duration/special effect play multiple of current video fragment).
Wherein, the pts value that special efficacy stream generation module upgrades each I frame in current special efficacy fragment comprises:
According to following formula, upgrade the pts value of each I frame in current special efficacy fragment:
The sequence number of pts value=(the video time scale/frame frequency of described ordinary video stream) * I frame
Wherein, the sequence number of I frame refers to the sequence number of I frame in whole special efficacy stream.
Wherein, described ordinary video stream can be the fMp4 video flowing based on HTTP adaptive video stream.
The foregoing is only the application's preferred embodiment, not in order to limit the application, all within the application's spirit and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of the application's protection.
Claims (12)
1. a special effect play method, is characterized in that, the method comprises:
Receive the special effect play request for a video source of user's input, in this request, carry special effect play multiple, in described video source file, only comprise ordinary video stream;
According to current time, in the ordinary video stream of video source file, find the initial video segment of corresponding special effect play;
From initial video segment, start to download;
After having downloaded a video segment, from the current video fragment of downloading, extract crucial I frame;
The quantity that copies of calculating I frame, according to the quantity that copies calculating, copies respectively each the I frame extracting, and obtains current special efficacy fragment corresponding to current video fragment;
According to special effect play multiple, upgrade the displaying time stamp pts value of each I frame in current special efficacy fragment, current special efficacy fragment is sent to player.
2. method according to claim 1, is characterized in that, after finding the initial video segment of corresponding special effect play in the described ordinary video at video source file stream, further comprised before initial video segment starts to download:
Calculate the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream;
Judge whether this ratio is greater than preset value, if so, determine and all download; Otherwise, determine and carry out part download;
Described from initial video segment, start to download be:
Whole downloads or part downloading mode according to determining, start to download from initial video segment.
3. method according to claim 1 and 2, is characterized in that, in this ordinary video stream of described calculating, before the duration of each video segment and the ratio of special effect play multiple, further comprises:
Judge whether current network bandwidth is not less than the proposed bandwidth of described ordinary video stream, if so, carry out the action of the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream of described calculating; Otherwise, determine and carry out part download.
4. method according to claim 1, is characterized in that, while comprising a plurality of ordinary video stream in described video source file,
The initial video segment that finds corresponding special effect play in the described stream of the ordinary video at video source file is:
In video source file, the ordinary video of option code flow rate minimum flows, and finds the initial video segment of corresponding special effect play in selected ordinary video stream.
5. method according to claim 1, is characterized in that, the quantity that copies of described calculating I frame is:
When downloading mode is while all downloading, I frame copy quantity=frame frequency * (length of special effect play multiple/picture group GOP);
When downloading mode is for part is when download, I frame copy quantity=frame frequency * (duration/special effect play multiple of current video fragment).
6. method according to claim 1, is characterized in that, in the current special efficacy fragment of described renewal, the pts value of each I frame comprises:
According to following formula, upgrade the pts value of each I frame in current special efficacy fragment:
The sequence number of pts value=(the video time scale/frame frequency of described ordinary video stream) * I frame
Wherein, the sequence number of I frame refers to the sequence number of I frame in whole special efficacy stream.
7. method according to claim 1, is characterized in that, described ordinary video stream is the fMp4 video flowing based on HTML (Hypertext Markup Language) HTTP adaptive video stream.
8. method according to claim 1, is characterized in that, described current special efficacy fragment is sent to after player and further comprised:
For each the I frame in current special efficacy fragment, player calculates the actual play moment t of this I frame according to following formula:
T=t
0+ (currentPTS-firstPTS) * special effect play multiple
Wherein, currentPTS is the pts value of current I frame, and firstPTS value is the pts value of first I frame in special efficacy stream, t
0for the actual play moment of first I frame in special efficacy stream.
9. a special effect play device, is characterized in that, this device comprises:
Download module: receive the special effect play request for a video source of user's input, carry special effect play multiple in this request, only comprise ordinary video stream in described video source file; According to current time, in the ordinary video stream of video source file, find the initial video segment of corresponding special effect play; From initial video segment, start to download;
I frame abstraction module: when download module has been downloaded after a video segment, extract crucial I frame from the current video fragment of downloading;
Special efficacy stream generation module: calculate the quantity that copies of I frame, according to the quantity that copies calculating, each I frame that I frame abstraction module is extracted copies respectively, obtains current special efficacy fragment corresponding to current video fragment; According to special effect play multiple, upgrade the displaying time stamp pts value of each I frame in current special efficacy fragment, current special efficacy fragment is sent to player.
10. device according to claim 9, is characterized in that, after described download module finds the initial video segment of corresponding special effect play in the ordinary video stream of video source file, further comprised before initial video segment starts to download:
Calculate the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream;
Judge whether this ratio is greater than preset value, if so, determine and all download; Otherwise, determine and carry out part download;
Described download module starts to download from initial video segment:
Whole downloads or part downloading mode according to determining, start to download from initial video segment.
11. according to the device described in claim 9 or 10, it is characterized in that, described download module calculates the duration of each video segment in this ordinary video stream and further comprises before with the ratio of special effect play multiple:
Judge whether current network bandwidth is not less than the proposed bandwidth of described ordinary video stream, if so, carry out the action of the duration of each video segment and the ratio of special effect play multiple in this ordinary video stream of described calculating; Otherwise, determine and carry out part download.
12. devices according to claim 9, is characterized in that, while comprising a plurality of ordinary video stream in described video source file,
The initial video segment that described download module finds corresponding special effect play in the ordinary video stream of video source file is:
In video source file, the ordinary video of option code flow rate minimum flows, and finds the initial video segment of corresponding special effect play in selected ordinary video stream.
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| CN103581741A (en) * | 2012-07-26 | 2014-02-12 | 三星电子（中国）研发中心 | Special-effect playing device and method |
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| CN102196008A (en) * | 2010-03-08 | 2011-09-21 | 株式会社日立制作所 | Peer-to-peer downloading method, video equipment and content transmission method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20141001 |