CN105208463A - Method and system for carrying out frame determination for m3u8 file - Google Patents
Method and system for carrying out frame determination for m3u8 file Download PDFInfo
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- CN105208463A CN105208463A CN201510549966.5A CN201510549966A CN105208463A CN 105208463 A CN105208463 A CN 105208463A CN 201510549966 A CN201510549966 A CN 201510549966A CN 105208463 A CN105208463 A CN 105208463A
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- key frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
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- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
The invention discloses a method and system for carrying out frame determination for an m3u8 file. The method is characterized by determining subsection where a seek point locates according to a segmentation mode of the m3u8 file; carrying out demultiplexing starting from a starting keyframe of a video in the subsection where the seek point locates, finding out front and back keyframes nearest to the seek point, and storing code stream section with the front and back keyframes nearest to the seek point being the start; and carrying out decoding starting from the starting keyframe of the stored code stream section, discarding decoding frame codes failing to reach the seek point until reaching the seek point, and keeping the decoding frame codes for video rendering. The method can solve the problem that when a user drags a sliding bar in the video on demand process, the sliding bar cannot reach an accurate time position, and can reach a preset position after playing for a relatively-long time.
Description
Technical field
The present invention relates to streaming media communication technical field, particularly in video request-program process to seek operation precise controlling.More specifically, the present invention relates to and a kind ofly carry out for m3u8 file the method and system that accurate frame determines.
Background technology
OTT mobile video service based on open the Internet meets one of best solution of many application demands such as live (Live), program request (OnDemand) and time shift (TimeShift) in the future.OTTTV is the abbreviation of " OverTheTopTV ", refers to the Video service based on open the Internet, and playback terminal can be television set, computer, Set Top Box, PAD, smart mobile phone etc.Mean to provide service on network, emphasize to serve the independence with physical network.Current common way is packaged into different Single documents according to the segmentation of certain time interval, different media coding format and code check large young pathbreaker media data, be referred to as segmentation, then all fragmented storage in service end, the information such as each segmentation and time span thereof are stored in a M3U8 formatted file, M3U8 index file is a kind of description document specified in HLS protocol, be also referred to as M3U8 description document, M3U8 file refers to the M3U file of UTF-8 coded format.M3U file have recorded an index text-only file, M3U8 file text mode is described media file, be made up of a series of label, when opening it, playout software is not play it, but finds the network address of corresponding audio-video document to play online according to its index; During broadcasting, this formatted file is transferred to client by service end, requires the segmental file that (as Seek operates) specifies from service end request and play by client according to the time location of current broadcasting or user operation.
Ideally, M3U8 is an index file, and be that ts flows encapsulation format containing file during video playback, pure audio can be adts encapsulation format, adopts segmented mode can bring advantage to Stochastic accessing is live.
But in actual conditions, M3U8 file also can be used for carrying out program request, when being formed by video format file transform such as MP4, FLV, its segmental file may be larger, as a segmentation exists 20 seconds, when carrying out slider bar in user's on-demand process and dragging, precise time position can not be reached, need the broadcasting relatively long time just can reach precalculated position, affect Consumer's Experience.
Summary of the invention
In view of this, technical problems to be solved in this application there is provided a kind ofly carries out for m3u8 file the method and system that frame determines, when it can solve in user video on-demand process and carry out slider bar dragging, precise time position can not be reached, need to play the problem that the relatively long time just can reach precalculated position, the present invention is intended to solve problems, and dragging process can arrive ideal position rapidly, wait for without the need to user, improve Consumer's Experience.
In order to solve the problems of the technologies described above, the application has following technical scheme:
Carry out for m3u8 file the method that frame determines, comprise the steps:
According to the segmented mode of m3u8 file, determine the place segmentation of seek point;
Demultiplexing from the starting keyframe of the video in the place segmentation of seek point, finds out and seek point immediate front and back key frame, and preserving the front and back key frame nearest with described seek point is initial code stream paragraph;
Decode from the starting keyframe of preserved code stream paragraph, the solution frame code not reaching seek point is abandoned, until the solution frame code reaching seek point then retains for Video Rendering.
Preferably, wherein, described from the starting keyframe of the video in the place segmentation of seek point demultiplexing, find out and seek point immediate front and back key frame, preserve with the nearest key frame place, front and back of described seek point be that initial code stream paragraph comprises with key frame:
Demultiplexing from the first key frame in the place segmentation of seek point, preserves the code stream paragraph between the first key frame and the second key frame;
Detect when running into the second key frame and finding not reach seek point, abandon the code stream paragraph between the first key frame and the second key frame, demultiplexing from the second key frame, preserve the code stream paragraph between the second key frame and the 3rd key frame,
Whether continuation detection runs into follow-up key frame and finds reach seek point and whether abandon corresponding code stream paragraph, until find to reach seek point, confirms that the front and back key frame of the code stream paragraph of last preservation is the front and back key frame nearest with described seek point.
Preferably, wherein, also comprise the steps:
Demultiplexing from the start frame of the audio frequency in the place segmentation of seek point, abandons the audio code stream not reaching seek point, plays up until the audio code stream reaching seek point is then preserved for audio decoder.
The invention also discloses and a kind ofly carry out for m3u8 file the system that frame determines, it is characterized in that, comprising:
Computing module, is configured to the segmented mode according to m3u8 file, determines the place segmentation of seek point;
Demultiplexing detection module, is configured to demultiplexing from the starting keyframe of the video in the place segmentation of determined seek point, finds out and seek point immediate front and back key frame;
Memory module, being configured to preserve the front and back key frame nearest with described seek point is initial code stream paragraph;
Decoder module, is configured to decode from the starting keyframe of preserved code stream paragraph, is abandoned by the solution frame code not reaching seek point, until the solution frame code reaching seek point is then preserved for Video Rendering.
Preferably, wherein, described demultiplexing detection module and described memory module are configured to: described demultiplexing module is demultiplexing from the first key frame, described memory module preserves the code stream paragraph between the first key frame and the second key frame in advance, when described demultiplexing detection module detects that running into the second key frame finds not reach seek point, described memory module abandons the code stream paragraph between the first key frame and the second key frame, described demultiplexing detection module demultiplexing from the second key frame, described memory module preserves the code stream paragraph between the second key frame and the 3rd key frame, whether described demultiplexing detection module continues to detect the follow-up key frame run into and finds to reach seek point and whether memory module abandons corresponding code stream paragraph, until find to reach seek point, the front and back key frame of the code stream paragraph that confirmation memory module is finally preserved is the front and back key frame nearest with described seek point.
Preferably, wherein,
Described demultiplexing detection module is also configured to demultiplexing from the start frame of the audio frequency in the place segmentation of seek point, is abandoned by the audio code stream not reaching seek point, plays up until the audio code stream reaching seek point is then preserved for audio decoder; Described decoder module is also configured to the audio code stream of decoding seek point.
Compared with prior art, the method and system described in the application, reaches following effect:
Solve the problem that cannot be accurate to the concrete accurate frame of video in prior art by m3u8.Because every segment ts stream file is less, adopt the method local solution of the present invention time that is multiplexing and decoding substantially can ignore, user is easy to drag (slip) bar arrival ideal point that rolls, and finds the video content wanted.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present application, and form a application's part, the schematic description and description of the application, for explaining the application, does not form the improper restriction to the application.In the accompanying drawings:
Fig. 1 shows the flow chart carrying out the method that frame is determined according to an embodiment of the invention for m3u8 file;
Fig. 2 shows the detailed execution figure of a kind of embodiment of the step S102 in the method in Fig. 1;
Fig. 3 shows the flow chart carrying out the method that frame is determined according to another embodiment of the present invention for m3u8 file;
Fig. 4 shows the flow chart carrying out the method that frame is determined for the m3u8 file containing pure audio;
The schematic diagram of method of the present invention applied by the m3u8 file that Fig. 5 shows a specific embodiment;
Fig. 6 shows and carries out for m3u8 file the system that frame determines according to of the present invention.
Embodiment
As employed some vocabulary to censure specific components in the middle of specification and claim.Those skilled in the art should understand, and hardware manufacturer may call same assembly with different noun.This specification and claims are not used as with the difference of title the mode distinguishing assembly, but are used as the criterion of differentiation with assembly difference functionally." comprising " as mentioned in the middle of specification and claim is in the whole text an open language, therefore should be construed to " including but not limited to ".Specification subsequent descriptions is implement the better embodiment of the application, and right described description is for the purpose of the rule that the application is described, and is not used to the scope limiting the application.The protection range of the application is when being as the criterion depending on the appended claims person of defining.
As shown in Figure 1, for carrying out for m3u8 file the method that frame determines according to an embodiment of the invention, the method is particularly useful for video file, and the method comprises the steps:
S101: according to the segmented mode of m3u8 file, determines the place segmentation of seek point.
The example of composition graphs 5 for example, m3u8 file has 3 segmentations, and the duration of each segmentation is 20 seconds, then and (0,19), (20,39), (40,59) 3 segmentations are respectively, if want in user's displaying video process to be dragged to 53 seconds places, then according to segmented mode, can determine that the seek point of 53 seconds is in the 3rd segmentation.
S102: demultiplexing from the starting keyframe of the video in the place segmentation of seek point, finds out and seek point immediate front and back key frame, and what preserve the front and back key frame place nearest with described seek point is initial code stream paragraph with key frame.
With reference to Fig. 5, in the 3rd segmentation, 40,45, the little flag of 50,55 represents the position at key frame place respectively, and in concrete material, the position of key frame is random, and this example is for reference only.From each key frame 40,45,50 of the 3rd segmentation, the key frame 40 in 55 starts demultiplexing, finds out the immediate front and back key frame 50,55 with 53, preserves GOP (50,54).
S103: decode from the starting keyframe of preserved code stream paragraph, abandons the solution frame code not reaching seek point, until the solution frame code reaching seek point then retains for Video Rendering.
The example of composition graphs 5, video decode starts decoding from the key frame of 50 seconds of GOP (50,54), being abandoned by the decoded frame not reaching 53 seconds, then starting Video Rendering when reaching 53 seconds.
Continue, with reference to Fig. 2, about the execution of step S102, following sub-step can be comprised:
S1021: demultiplexing from the first key frame in the place segmentation of seek point, preserves the code stream paragraph between the first key frame and the second key frame;
S1022: detect when running into the second key frame and finding not reach seek point, abandon the code stream paragraph between the first key frame and the second key frame, demultiplexing from the second key frame, preserve the code stream paragraph between the second key frame and the 3rd key frame;
S1023: whether continuation detection runs into follow-up key frame and find reach seek point and whether abandon corresponding code stream paragraph, until find to reach seek point, confirm that the front and back key frame of the last code stream paragraph preserved is the front and back key frame nearest with described seek point.
The example of composition graphs 5, step S1021 ~ S023 such as shows as:
First, demultiplexing from 40 seconds of the 3rd segmentation, preserve GOP (40, 44), from, find not yet to the seek point position of 53 seconds after running into 45 seconds, then abandon GOP (40, 44), demultiplexing from 45 seconds, preserve with 45 seconds initial GOP (45, 49), find after running into 50 seconds, not yet to the seek point position of 53 seconds, then abandon GOP (45, 49), demultiplexing from 50 seconds, preserve with 50 seconds initial GOP (50, 54), until find that the seek point running into 53 seconds is positioned at GOP (50, 54) in, determine to find 50 and 54 for immediate key frame, traversal terminates.
By above-mentioned Fig. 1 and Fig. 2, can find, method of the present invention first opens beginning demultiplexing from section, preserves GOP, when running into new GOP, GOP (now not yet arriving seek point) before abandoning, until arrive immediate key frame to start decoding, therefore only preserve immediate GOP, from then on the key frame of GOP starts decoding, the decoded frame arrived before seek point all abandons, until seek point starts to play up normally.Therefore, the time of demultiplexing and decoding is considerably less, substantially negligible, promptly can arrive ideal point.
With reference to Fig. 3, for carrying out for m3u8 file the method that frame determines according to another embodiment of the present invention, the method is particularly useful for the file simultaneously comprising Audio and Video, comprises the steps:
S201 ~ S203: enforcement and the above-mentioned S101 ~ S103 of this step are similar, do not repeat them here.
S202 ': demultiplexing from the start frame of the audio frequency in the place segmentation of seek point, abandons the audio code stream not reaching seek point, plays up until the audio code stream reaching seek point is then preserved for decoding.
The example of composition graphs 5, S202 ' shows as: demultiplexing from 40 seconds, is abandoned by the code stream of do not reach 53 seconds 40 ~ 52, until reach the code stream of 53 seconds, recovers normal decoding and plays up.
With reference to Fig. 4, for carrying out the flow chart of the method that frame is determined for the m3u8 file containing pure audio.
Consider the particularity of pure audio files, each frame in the place segmentation of seek point can be considered as key frame.Said method comprises the steps:
S301: according to the segmented mode of m3u8 file, determines the place segmentation of seek point.Enforcement and the above-mentioned S101 of this step are similar, do not repeat them here.
S302: demultiplexing from the start frame in each frame in the place segmentation of seek point, abandons the code stream not reaching seek point, plays up until the code stream reaching seek point is then preserved for decoding.
Similarly, the example of composition graphs 5, shows as: demultiplexing from 40 seconds, is abandoned by the code stream of do not reach 53 seconds 40 ~ 52, until reach the code stream of 53 seconds, recovers normal decoding and plays up.
Said method of the present invention, compared to prior art, if want in client playing process to drag to 53 seconds places, original method directly arrives the 3rd segmentation place, namely from 40 seconds places, decoding was play, until broadcast point reaches 53 seconds places, namely needed to allow the time of 13 seconds (53-40) such as clients could arrive desirable broadcast point, the operation that method of the present invention is determined for frame is more accurate, and Audio and Video can arrive ideal point fast.
The above-mentioned method relevant with the embodiment shown in Fig. 1, with reference to Fig. 6, can system according to the present invention be implemented.
For the system of carrying out frame in m3u8 file and determining, comprising:
Computing module, is configured to the segmented mode according to m3u8 file, determines the place segmentation of seek point;
Demultiplexing detection module, is configured to demultiplexing from the starting keyframe of the video in the place segmentation of determined seek point, finds out and seek point immediate front and back key frame;
Memory module, being configured to preserve the front and back key frame nearest with described seek point is initial code stream paragraph;
Decoder module, is configured to decode from the starting keyframe of preserved code stream paragraph, is abandoned by the solution frame code not reaching seek point, until the solution frame code reaching seek point is then preserved for Video Rendering.
Wherein, for the configuration relation between memory module and demultiplexing detection module, such as can be further configured to: described demultiplexing module is demultiplexing from the first key frame, described memory module preserves the code stream paragraph between the first key frame and the second key frame in advance, when described demultiplexing detection module detects that running into the second key frame finds not reach seek point, described memory module abandons the code stream paragraph between the first key frame and the second key frame, described demultiplexing detection module demultiplexing from the second key frame, described memory module preserves the code stream paragraph between the second key frame and the 3rd key frame, whether described demultiplexing detection module continues to detect the follow-up key frame run into and finds to reach seek point and whether described memory module abandons corresponding code stream paragraph, until find to reach seek point, the front and back key frame of the code stream paragraph that confirmation memory module is finally preserved is the front and back key frame nearest with described seek point.
The above-mentioned method relevant for the embodiment shown in Fig. 3, the following system of the present invention can be implemented (such as can with reference to Fig. 6).
For the system of carrying out frame in m3u8 file and determining, comprising:
Computing module, is configured to the segmented mode according to m3u8 file, determines the place segmentation of seek point;
Demultiplexing detection module, is configured to: demultiplexing from the starting keyframe of the video in the place segmentation of determined seek point, finds out the front and back key frame with the immediate video of seek point; Demultiplexing from the start frame of the audio frequency in the place segmentation of seek point, abandons the audio code stream not reaching seek point, until the audio code stream reaching seek point is then preserved for decoding;
Memory module, the front and back key frame being configured to preserve the video nearest with described seek point is initial code stream paragraph;
Decoder module, is configured to decode from the starting keyframe of preserved video code flow paragraph, is abandoned by the solution frame code not reaching seek point, until the solution frame code reaching seek point is then preserved for Video Rendering; The audio code stream of decoding seek point.
Wherein, if the operand of system is pure audio files, the demultiplexing detection module of system can be configured to only demultiplexing from the start frame of the audio frequency in the place segmentation of seek point, the audio code stream not reaching seek point is abandoned, until the audio code stream reaching seek point is then preserved for decoding; The memory module of system can not work, and decoder module can be configured to only to decode the audio code stream of seek point.
Those skilled in the art should understand, the embodiment of the application can be provided as method, device or computer program.Therefore, the application can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the application can adopt in one or more form comprising there being the upper computer program implemented of the computer-usable storage medium of computer usable program code (including but not limited to magnetic disc store, CD-ROM, optical memory etc.).
Above-mentioned explanation illustrate and describes some preferred embodiments of the application, but as previously mentioned, be to be understood that the application is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in invention contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the application, then all should in the protection range of the application's claims.
Claims (6)
1. carry out for m3u8 file the method that frame determines, comprise the steps:
According to the segmented mode of m3u8 file, determine the place segmentation of seek point;
Demultiplexing from the starting keyframe of the video in the place segmentation of seek point, finds out and seek point immediate front and back key frame, and preserving the front and back key frame nearest with described seek point is initial code stream paragraph;
Decode from the starting keyframe of preserved code stream paragraph, the solution frame code not reaching seek point is abandoned, until the solution frame code reaching seek point then retains for Video Rendering.
2. method according to claim 1, it is characterized in that, described from the starting keyframe of the video in the place segmentation of seek point demultiplexing, find out and seek point immediate front and back key frame, what preserve the front and back key frame place nearest with described seek point is that initial code stream paragraph comprises with key frame:
Demultiplexing from the first key frame in the place segmentation of seek point, preserves the code stream paragraph between the first key frame and the second key frame;
Detect when running into the second key frame and finding not reach seek point, abandon the code stream paragraph between the first key frame and the second key frame, demultiplexing from the second key frame, preserve the code stream paragraph between the second key frame and the 3rd key frame,
Whether continuation detection runs into follow-up key frame and finds reach seek point and whether abandon corresponding code stream paragraph, until find to reach seek point, confirms that the front and back key frame of the code stream paragraph of last preservation is the front and back key frame nearest with described seek point.
3. method according to claim 1 and 2, is characterized in that, also comprises the steps:
Demultiplexing from the start frame of the audio frequency in the place segmentation of seek point, abandons the audio code stream not reaching seek point, plays up until the audio code stream reaching seek point is then preserved for audio decoder.
4. carry out for m3u8 file the system that frame determines, it is characterized in that, comprising:
Computing module, is configured to the segmented mode according to m3u8 file, determines the place segmentation of seek point;
Demultiplexing detection module, is configured to demultiplexing from the starting keyframe of the video in the place segmentation of determined seek point, finds out and seek point immediate front and back key frame;
Memory module, being configured to preserve the front and back key frame nearest with described seek point is initial code stream paragraph;
Decoder module, is configured to decode from the starting keyframe of preserved code stream paragraph, is abandoned by the solution frame code not reaching seek point, until the solution frame code reaching seek point is then preserved for Video Rendering.
5. system according to claim 4, it is characterized in that, described demultiplexing detection module and described memory module are configured to: described demultiplexing module is demultiplexing from the first key frame, described memory module preserves the code stream paragraph between the first key frame and the second key frame in advance, when described demultiplexing detection module detects that running into the second key frame finds not reach seek point, described memory module abandons the code stream paragraph between the first key frame and the second key frame, described demultiplexing detection module demultiplexing from the second key frame, described memory module preserves the code stream paragraph between the second key frame and the 3rd key frame, whether described demultiplexing detection module continues to detect the follow-up key frame run into and finds to reach seek point and whether memory module abandons corresponding code stream paragraph, until find to reach seek point, the front and back key frame of the code stream paragraph that confirmation memory module is finally preserved is the front and back key frame nearest with described seek point.
6. the system according to claim 4 or 5, is characterized in that,
Described demultiplexing detection module is also configured to demultiplexing from the start frame of the audio frequency in the place segmentation of seek point, is abandoned by the audio code stream not reaching seek point, plays up until the audio code stream reaching seek point is then preserved for audio decoder; Described decoder module is also configured to the audio code stream of decoding seek point.
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