CN104796702A - H264 video frame rate conversion method and device - Google Patents
H264 video frame rate conversion method and device Download PDFInfo
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Abstract
The invention discloses an H264 video frame rate conversion method and device and aims to convert the frame rate of H264 standard video frames. The method includes: acquiring H264 video frames in a unit time; decoding the H264 video frames in the unit time to obtain decoded RAW video frames; subjecting current frame rate of the RAW video frames to constant-interval conversion. The H264 video frame rate conversion method and device according to the technical scheme has the advantages that by decoding the H264 video frames in the unit time and converting the frame rate of the decoded RAW video frames, conversion of the frame rate of the H264 standard video frames is achieved, and the requirements of video on different frame rates are met.
Description
Technical field
The present invention relates to Internet technical field, particularly a kind of conversion method of H264 video frame rate and device.
Background technology
Through the development of multi-media processing technology in recent years, frame rate conversion is not only used for changing between video format and standard, also the total quality of augmented video is used for, higher frame per second is used to provide the important composition of more high-quality home videos by becoming, but, in existing video, some can't use at the higher frame rate, and therefore, frame rate conversion becomes very necessary.For the video of multiple different coding standard, how to carry out frame rate conversion targetedly, become the research topic that current MultiMedia Field is very important.
Summary of the invention
The invention provides a kind of conversion method and device of H264 video frame rate, in order to realize the frame rate conversion of the frame of video of H264 standard.
The invention provides a kind of conversion method of H264 video frame rate, comprising:
Obtain the H264 frame of video in unit time;
H264 frame of video in described unit time is decoded, obtains decoded RAW frame of video;
Conversion operations is at equal intervals carried out to the current frame rate of described RAW frame of video.
In one embodiment, described conversion operations comprises the operation of increasing frame or subtracts frame operation.
In one embodiment, described conversion operations comprise subtract frame operation time, described H264 frame of video in described unit time is decoded before, described method also comprises:
According to the classification of described H264 frame of video, the I frame in described H264 frame of video is marked, obtain the markd frame of video of band;
The described current frame rate to described RAW frame of video carries out conversion operations at equal intervals, comprising:
Determine that described RAW frame of video needs the frame number reduced;
According to the described current frame rate needing frame number and the described RAW frame of video reduced, determine the first interval abandoning frame of video;
According to described first interval and the markd frame of video of described band, determine the frame of video needing to abandon;
Abandon the frame of video that described needs abandon.
In one embodiment, described according to described first interval and the markd frame of video of described band, determine the frame of video needing to abandon, comprising:
According to described first interval, determine alternative videos frame;
Judge whether described alternative videos frame is the markd frame of video of described band;
When described alternative videos frame is the markd frame of video of described band, the next frame of video of described alternative videos frame is defined as the frame of video needing to abandon;
When described alternative videos frame is not the markd frame of video of described band, described alternative videos frame is defined as the frame of video needing to abandon.
In one embodiment, when described conversion operations comprises the operation of increasing frame, the described current frame rate to described RAW frame of video carries out conversion operations at equal intervals, comprising:
Determine that described RAW frame of video needs the frame number increased;
According to the described current frame rate needing frame number and the described RAW frame of video increased, determine the second interval increasing frame of video;
According to described second interval, determine the position of inserting frame of video in described RAW frame of video;
Copy the previous RAW frame of video of described position, and the RAW frame of video after described copying is inserted in described position.
Some beneficial effects of the embodiment of the present invention can comprise:
This technical scheme by decoding to the H264 frame of video in unit time respectively, and then carries out frame rate conversion to decoded RAW frame of video, achieves the frame rate conversion of the frame of video of H264 standard, thus meets the requirement of video to different frame per second.
The invention provides a kind of conversion equipment of H264 video frame rate, comprising:
Acquisition module, for obtaining the H264 frame of video in unit time;
Decoder module, for decoding to the H264 frame of video in described unit time, obtains decoded RAW frame of video;
Modular converter, for carrying out conversion operations at equal intervals to the current frame rate of described RAW frame of video.
In one embodiment, described device also comprises:
Mark module, for described conversion operations comprise subtract frame operation time, according to the classification of described H264 frame of video, the I frame in described H264 frame of video is marked, obtain band markd frame of video;
Described modular converter comprises:
First determines submodule, for determining that described RAW frame of video needs the frame number reduced;
Second determines submodule, for according to the described current frame rate needing frame number and the described RAW frame of video reduced, determines the first interval abandoning frame of video;
3rd determines submodule, for according to described first interval and the markd frame of video of described band, determines the frame of video needing to abandon;
Abandon submodule, for abandoning the frame of video that described needs abandon.
In one embodiment, the described 3rd determines that submodule comprises:
First determining unit, for according to described first interval, determines alternative videos frame;
Judging unit, for judging whether described alternative videos frame is the markd frame of video of described band;
Second determining unit, during for being the markd frame of video of described band when described alternative videos frame, is defined as the frame of video needing to abandon by the next frame of video of described alternative videos frame;
3rd determining unit, during for not being the markd frame of video of described band when described alternative videos frame, is defined as the frame of video needing to abandon by described alternative videos frame.
In one embodiment, described modular converter comprises:
4th determines submodule, when comprising the operation of increasing frame for described conversion operations, determines that described RAW frame of video needs the frame number increased;
5th determines submodule, for according to the described current frame rate needing frame number and the described RAW frame of video increased, determines the second interval increasing frame of video;
6th determines submodule, for according to described second interval, determines the position of inserting frame of video in described RAW frame of video;
Intron module, for copying the previous RAW frame of video of described position, and is inserted into the RAW frame of video after described copying in described position.
Some beneficial effects of the embodiment of the present invention can comprise:
This device by decoding to the H264 frame of video in unit time respectively, and then carries out frame rate conversion to decoded RAW frame of video, achieves the frame rate conversion of the frame of video of H264 standard, thus meets the requirement of video to different frame per second.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of the conversion method of a kind of H264 video frame rate in the embodiment of the present invention;
Fig. 2 is the flow chart subtracting frame method of a kind of H264 video frame rate in the embodiment of the present invention;
Fig. 3 is the flow chart subtracting step S26 in frame method of a kind of H264 video frame rate in the embodiment of the present invention;
Fig. 4 is the flow chart of step S13 in the conversion method of a kind of H264 video frame rate in the embodiment of the present invention;
Fig. 5 is the block diagram of the conversion equipment of a kind of H264 video frame rate in the embodiment of the present invention;
Fig. 6 is the block diagram of modular converter 53 in the conversion equipment of a kind of H264 video frame rate in the embodiment of the present invention;
Fig. 7 is the 3rd block diagram determining submodule 533 in the conversion equipment of a kind of H264 video frame rate in the embodiment of the present invention;
Fig. 8 is the block diagram of modular converter 53 in the conversion equipment of a kind of H264 video frame rate in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Fig. 1 is the flow chart of the conversion method of a kind of H264 video frame rate in the embodiment of the present invention, as shown in Figure 1, comprises the following steps S11-S13:
Step S11, obtains the H264 frame of video in unit time.
Wherein, unit time was as 1 second.
Step S12, decodes to the H264 frame of video in unit time, obtains decoded RAW frame of video.
Step S13, carries out conversion operations at equal intervals to the current frame rate of RAW frame of video.
H264 frame of video in unit time carried out after frame rate conversion completes, then carry out frame rate conversion to the H264 frame of video in other unit duration, the step of conversion is identical with above-mentioned steps S11-S13, until whole H264 frame of video is carried out frame rate conversion.
Adopt the technical scheme of the embodiment of the present invention, by decoding to the H264 frame of video in unit time respectively, and then frame rate conversion is carried out to decoded RAW frame of video, achieve the frame rate conversion of the frame of video of H264 standard, thus meet the requirement of video to different frame per second.
In above-described embodiment, conversion operations comprises the operation of increasing frame or subtracts frame operation.For different conversion operations, the method changed the current frame rate of RAW frame of video is also different.Be described respectively for different conversion operations below.
When conversion operations comprise subtract frame operation time, owing to comprising I frame in H264 frame of video, B frame, P frame, wherein, I frame (I frame) is also called Intra pictures (intra picture), first frame of the normally each GOP of I frame (a kind of video compression technology that MPEG uses), through moderately compressing, as the reference point of random access, image can be treated as, therefore carry out can not abandoning I frame when subtracting frame operation, but there is no I in the RAW frame of video obtained after decoding, B, the difference of P frame, therefore, when carrying out subtracting frame operation, need in advance by I frame flag wherein out.Figure 2 shows that the flow chart subtracting frame method of a kind of H264 video frame rate in the embodiment of the present invention, as shown in Figure 2, comprise the following steps S21-S27:
Step S21, obtains the H264 frame of video in unit time.
Step S22, according to the classification of H264 frame of video, marks the I frame in H264 frame of video, obtains the markd frame of video of band.
Step S23, decodes to the H264 frame of video in unit time, obtains decoded RAW frame of video.
Step S24, determines that RAW frame of video needs the frame number reduced.Such as, the current frame rate of H264 frame of video is m, requires that the frame per second after changing is n, and wherein, m > n, so needs the frame number reduced to be m-n.
Step S25, the current frame rate of the frame number reduced as required and RAW frame of video, determines the first interval abandoning frame of video.According to abandoning frame of video at equal intervals during owing to carrying out subtracting frame operation, the frame number that therefore can reduce as required and current frame rate, determine the interval abandoning frame of video.
Step S26, according to the first interval and the markd frame of video of band, determines the frame of video needing to abandon.
Step S27, abandons the frame of video needing to abandon.
In above-described embodiment, as shown in Figure 3, step S26 may be embodied as following steps S261-S264:
Step S261, according to the first interval, determines alternative videos frame.
Step S262, judges whether alternative videos frame is the markd frame of video of band; If alternative videos frame is the markd frame of video of band, then perform step S263; If alternative videos frame is not the markd frame of video of band, then perform step S264.
Step S263, is defined as the frame of video needing to abandon by the next frame of video of alternative videos frame.
Step S264, is defined as the frame of video needing to abandon by alternative videos frame.
Adopt the technical scheme in above-described embodiment, the I frame in H264 frame of video is marked in advance, thus I frame can be recognized exactly when abandoning frame, and then determine the frame of video needing to abandon exactly, realize the frame rate conversion of H264 frame of video.
When conversion operations comprise increase frame operation time, when carrying out increasing frame to H264 video frame rate after having implemented the step S11-S12 in above-described embodiment, can according to step S41-S44 implementation step S13 as shown in Figure 4:
Step S41, determines that RAW frame of video needs the frame number increased.Such as, the current frame rate of H264 frame of video is m, requires that the frame per second after changing is n, and wherein, n > m, so needs the frame number increased to be n-m.
Step S42, the current frame rate of the frame number increased as required and RAW frame of video, determines the second interval increasing frame of video.According to increasing frame of video at equal intervals during owing to carrying out increasing frame operation, the frame number that therefore can increase as required and current frame rate, determine the interval increasing frame of video.
Step S43, according to the second interval, determines the position of inserting frame of video in RAW frame of video.
Step S44, copies the previous RAW frame of video of this position, and the RAW frame of video after copying is inserted in this position.
Corresponding to the conversion method of a kind of H264 video frame rate that above-described embodiment provides, the embodiment of the present invention also provides a kind of conversion equipment of H264 video frame rate, and as shown in Figure 5, this device comprises:
Acquisition module 51, for obtaining the H264 frame of video in unit time;
Decoder module 52, for decoding to the H264 frame of video in unit time, obtains decoded RAW frame of video;
Modular converter 53, for carrying out conversion operations at equal intervals to the current frame rate of RAW frame of video.
In one embodiment, said apparatus also comprises mark module, for conversion operations comprise subtract frame operation time, according to the classification of H264 frame of video, the I frame in H264 frame of video is marked, obtain band markd frame of video.
Now, as shown in Figure 6, modular converter 53 comprises:
First determines submodule 531, for determining that RAW frame of video needs the frame number reduced;
Second determines submodule 532, for the current frame rate of the frame number that reduces as required and RAW frame of video, determines the first interval abandoning frame of video;
3rd determines submodule 533, for according to the first interval and the markd frame of video of band, determines the frame of video needing to abandon;
Abandon submodule 534, for abandoning the frame of video needing to abandon.
In one embodiment, as shown in Figure 7, the 3rd determines that submodule 533 comprises:
First determining unit 5331, for according to the first interval, determines alternative videos frame;
Judging unit 5332, for judging whether alternative videos frame is the markd frame of video of band;
Second determining unit 5333, during for being the markd frame of video of band when alternative videos frame, is defined as the frame of video needing to abandon by the next frame of video of alternative videos frame;
3rd determining unit 5334, during for not being the markd frame of video of band when alternative videos frame, is defined as the frame of video needing to abandon by alternative videos frame.
In one embodiment, as shown in Figure 8, modular converter 53 comprises:
4th determines submodule 535, when comprising the operation of increasing frame for conversion operations, determines that RAW frame of video needs the frame number increased;
5th determines submodule 536, for the current frame rate of the frame number that increases as required and RAW frame of video, determines the second interval increasing frame of video;
6th determines submodule 537, for according to the second interval, determines the position of inserting frame of video in RAW frame of video;
Intron module 538, for the previous RAW frame of video of duplicating position, and is inserted into the RAW frame of video after copying in position.
Adopt the device that the embodiment of the present invention provides, by decoding to the H264 frame of video in unit time respectively, and then frame rate conversion is carried out to decoded RAW frame of video, achieve the frame rate conversion of the frame of video of H264 standard, thus meet the requirement of video to different frame per second.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (9)
1. a conversion method for H264 video frame rate, is characterized in that, comprising:
Obtain the H264 frame of video in unit time;
H264 frame of video in described unit time is decoded, obtains decoded RAW frame of video;
Conversion operations is at equal intervals carried out to the current frame rate of described RAW frame of video.
2. the method for claim 1, is characterized in that, described conversion operations comprises the operation of increasing frame or subtracts frame operation.
3. method as claimed in claim 2, is characterized in that,
Described conversion operations comprise subtract frame operation time, described H264 frame of video in described unit time is decoded before, described method also comprises:
According to the classification of described H264 frame of video, the I frame in described H264 frame of video is marked, obtain the markd frame of video of band;
The described current frame rate to described RAW frame of video carries out conversion operations at equal intervals, comprising:
Determine that described RAW frame of video needs the frame number reduced;
According to the described current frame rate needing frame number and the described RAW frame of video reduced, determine the first interval abandoning frame of video;
According to described first interval and the markd frame of video of described band, determine the frame of video needing to abandon;
Abandon the frame of video that described needs abandon.
4. method as claimed in claim 3, is characterized in that,
Described according to described first interval and the markd frame of video of described band, determine the frame of video needing to abandon, comprising:
According to described first interval, determine alternative videos frame;
Judge whether described alternative videos frame is the markd frame of video of described band;
When described alternative videos frame is the markd frame of video of described band, the next frame of video of described alternative videos frame is defined as the frame of video needing to abandon;
When described alternative videos frame is not the markd frame of video of described band, described alternative videos frame is defined as the frame of video needing to abandon.
5. method as claimed in claim 2, is characterized in that,
When described conversion operations comprises the operation of increasing frame, the described current frame rate to described RAW frame of video carries out conversion operations at equal intervals, comprising:
Determine that described RAW frame of video needs the frame number increased;
According to the described current frame rate needing frame number and the described RAW frame of video increased, determine the second interval increasing frame of video;
According to described second interval, determine the position of inserting frame of video in described RAW frame of video;
Copy the previous RAW frame of video of described position, and the RAW frame of video after described copying is inserted in described position.
6. a conversion equipment for H264 video frame rate, is characterized in that, comprising:
Acquisition module, for obtaining the H264 frame of video in unit time;
Decoder module, for decoding to the H264 frame of video in described unit time, obtains decoded RAW frame of video;
Modular converter, for carrying out conversion operations at equal intervals to the current frame rate of described RAW frame of video.
7. device as claimed in claim 6, is characterized in that,
Described device also comprises:
Mark module, for described conversion operations comprise subtract frame operation time, according to the classification of described H264 frame of video, the I frame in described H264 frame of video is marked, obtain band markd frame of video;
Described modular converter comprises:
First determines submodule, for determining that described RAW frame of video needs the frame number reduced;
Second determines submodule, for according to the described current frame rate needing frame number and the described RAW frame of video reduced, determines the first interval abandoning frame of video;
3rd determines submodule, for according to described first interval and the markd frame of video of described band, determines the frame of video needing to abandon;
Abandon submodule, for abandoning the frame of video that described needs abandon.
8. device as claimed in claim 7, it is characterized in that, the described 3rd determines that submodule comprises:
First determining unit, for according to described first interval, determines alternative videos frame;
Judging unit, for judging whether described alternative videos frame is the markd frame of video of described band;
Second determining unit, during for being the markd frame of video of described band when described alternative videos frame, is defined as the frame of video needing to abandon by the next frame of video of described alternative videos frame;
3rd determining unit, during for not being the markd frame of video of described band when described alternative videos frame, is defined as the frame of video needing to abandon by described alternative videos frame.
9. device as claimed in claim 6, it is characterized in that, described modular converter comprises:
4th determines submodule, when comprising the operation of increasing frame for described conversion operations, determines that described RAW frame of video needs the frame number increased;
5th determines submodule, for according to the described current frame rate needing frame number and the described RAW frame of video increased, determines the second interval increasing frame of video;
6th determines submodule, for according to described second interval, determines the position of inserting frame of video in described RAW frame of video;
Intron module, for copying the previous RAW frame of video of described position, and is inserted into the RAW frame of video after described copying in described position.
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| CN106028139A (en) * | 2016-05-16 | 2016-10-12 | 乐视控股（北京）有限公司 | Real-time transcoding method and device for use in frame rate reducing process |
| CN108377400A (en) * | 2018-03-07 | 2018-08-07 | 广州图普网络科技有限公司 | A kind of image transmitting optimization method, system and its apparatus |
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| CN104796702B (en) | 2018-05-08 |
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