CN112019856A - Video reversing method and system for smart phone - Google Patents
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- CN112019856A CN112019856A CN202010876762.3A CN202010876762A CN112019856A CN 112019856 A CN112019856 A CN 112019856A CN 202010876762 A CN202010876762 A CN 202010876762A CN 112019856 A CN112019856 A CN 112019856A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/177—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a group of pictures [GOP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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Abstract
The invention relates to the technical field of video inversion, in particular to a video inversion method and a video inversion system for a smart phone, wherein the method comprises the following steps: the method comprises the steps of firstly detecting the size of the residual space of a mobile phone memory, then setting the cache size according to the size of the residual space of the mobile phone memory, then detecting the size of GOP (group of pictures) of the largest GOP (group of pictures) of a video, next comparing the cache size with the GOP size, finally carrying out reverse-order decoding and encoding on the GOP in different modes through a decoding thread and an encoding thread according to a comparison result, and sending the reverse-order GOP to an encoder to obtain a reverse video. The invention can better obtain the reverse video, has small error rate, very convenient operation, small time consumption and high user experience.
Description
Technical Field
The invention relates to the technical field of video inversion, in particular to a video inversion method and a video inversion system for a smart phone.
Background
Nowadays, with the development of short videos on smart phones, various interesting video forms are favored, and video inversion is a very typical case.
At present, the common practice is to decode videos according to GOPs, and store the decoded video frames of each GOP in a cache from the last GOP, and then send the video frames to an encoder in a reverse order for encoding, so as to obtain a reversed video, however, if the storage space of the device is not enough to store the video of one GOP, the above operations cannot be performed, and as the definition of the video is higher and higher (such as 4k video), the probability of the situation is higher and higher, in addition, the time consumption of the above scheme is also higher, and the waiting time for a user not to perform video reversal once is longer, so that the user experience is not good.
Disclosure of Invention
It is an object of the present invention to provide a video rewind method and system for a smartphone that overcomes some or all of the deficiencies of the prior art.
The invention provides a video reversing method for a smart phone, which comprises the following steps:
firstly, setting cache size;
secondly, detecting the space size GOP size of the maximum GOP of the video;
thirdly, comparing the cache size with the GOP size, if the cache size is smaller than the GOP size, performing the next step, and if the GOP size is smaller than the cache size and smaller than 2 × GOP size, performing the eighth step; if the cache size is larger than 2 × GOP size, performing the step ten;
fourthly, dividing the cache into two caches which are respectively cache1 and cache 2;
fifthly, the detection cache1 can store several decoded video frames, and the number of the video frames is set as frame num;
sixthly, starting two decoding threads and one encoding thread;
seventhly, starting from the last GOP, alternately decoding frame num video frames by the two decoding threads, storing the frame num video frames into the corresponding cache1 and cache2, then sending the video frames in the cache1 and cache2 into the encoding threads in a reverse order for encoding until the last GOP is finished, and repeating the same operation until all the GOPs are finished;
eighthly, starting a decoding thread;
starting from the last GOP, caching the video frame of the last GOP into the cache by the decoding thread, and then sending the video frame in the cache into the encoding thread in a reverse order for encoding until all the GOPs are finished;
dividing the cache into two caches, namely cache A and cache B;
eleven, starting two decoding threads and one encoding thread;
and twelfth, starting from the last GOP, alternately decoding the video frames of the last GOP by the two decoding threads, storing the video frames into the corresponding cache A and cache B, then sending the video frames in the cache A and cache B into the encoding thread in a reverse order for encoding, and repeating the same operation until all the GOPs are finished.
Preferably, before the first step, the size of the remaining space of the mobile phone memory is detected, and then the cache size is set according to the size of the remaining space of the mobile phone memory.
Preferably, the seventh step specifically includes the following steps:
(7.1), the first decoding thread starts decoding from the last GOP and stores the frame num video frames of the last group of the GOP into the cache 1;
(7.2) sending the video frames in the cache1 to an encoding thread in a reverse order for encoding;
(7.3), the second decoding thread starts to decode from the last GOP and stores the second last frame num video frames of the GOP into the cache 2;
(7.4) sending the video frames of the cache2 into an encoding thread in a reverse order for encoding;
(7.5) the first decoding thread starts to decode the last-to-last group of frame num videos of the last GOP and feeds the videos into the encoder in the reverse order until all the video frames of the last GOP are finished;
(7.6) the second decoding thread starts to decode the fourth last group of frame num videos of the last GOP and feeds the videos into the encoder in the reverse order until all the video frames of the last GOP are finished;
(7.7) the video decoding and encoding work for the penultimate GOP begins until all GOPs are completed.
Preferably, in steps (7.2) and (7.4), after the encoding thread completes video encoding in the cache1 or the cache2, the cache1 or the cache2 is released.
Preferably, the step nine specifically includes the following steps:
(9.1) starting a decoding thread to start decoding from the last GOP;
(9.2) caching the video frame of the last GOP into a cache;
(9.3) starting an encoding thread to encode, and transmitting the video frames in the cache into the encoding thread in a reverse order;
and (9.4) the decoding thread starts decoding and buffering the last-but-one GOP, and then the GOPs are sent to the encoding thread in a reverse order for encoding until all the GOPs are finished.
Preferably, in step (9.3), after all video frames in the cache are encoded, the cache is released.
Preferably, the step twelve specifically comprises the following steps:
(12.1), the first decoding thread starts to decode from the last GOP and stores the video frames of the GOP in cacheA;
(12.2) sending the video frames in the cacheA to an encoding thread in a reverse order for encoding;
(12.3) the second decoding thread starts to decode from the last GOP and stores the video frame of the GOP in the cache B;
(12.4) sending the video frames of the cache B into an encoding thread in a reverse order for encoding;
(12.5) the first decoding thread starts to decode the third last GOP, stores the decoded video frames in cacheA and sends the video frames to an encoder in the reverse order until all the GOPs are finished;
(12.6) the second decoding thread starts to decode the fourth last GOP, stores the decoded video frame in the cache B and sends the video frame to the encoder in the reverse order until all the GOPs are finished.
Preferably, in the steps (12.2) and (12.4), the encoding thread completes video encoding in the cache a or the cache B, and releases the cache a or the cache B.
The present invention also provides a video rewind system for a smartphone, comprising:
the memory detection module is used for detecting the size of the residual space of the mobile phone memory;
the cache size setting module is connected with the memory detection module and used for setting cache size according to the size of the residual space of the mobile phone memory;
the GOP space detection module is used for detecting the space size GOP size of the maximum GOP of the video;
the comparison module is connected with the cache size setting module and the GOP space detection module and is used for comparing the cache size and the GOP size;
the first decoding module is connected with the comparison module and used for decoding when the cache size is smaller than the GOP size;
the second decoding module is connected with the comparison module and used for decoding when the GOP size is smaller than the cache size and smaller than 2 GOP size;
the third decoding module is connected with the comparison module and is used for decoding when the cache size is larger than 2 × GOP size;
and the encoder is connected with the first decoding module, the second decoding module and the third decoding module and is used for receiving the video frames transmitted in the reverse order in the decoding process.
According to the comparison result, the GOP is subjected to reverse order decoding and encoding in different modes through the decoding thread and the encoding thread, and the GOP is sent to an encoder in a reverse order, so that a reverse video is obtained. The invention can better obtain the reverse video, has small error rate, very convenient operation, small time consumption and high user experience.
Drawings
Fig. 1 is a flowchart of a video rewinding method for a smartphone according to embodiment 1;
fig. 2 is a block diagram showing a video rewind system for a smartphone according to embodiment 1.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not limiting.
Example 1
As shown in fig. 1, the present embodiment provides a video rewinding method for a smartphone, which includes the following steps:
firstly, setting cache size;
secondly, detecting the space size GOP size of the maximum GOP of the video;
thirdly, comparing the cache size with the GOP size, if the cache size is smaller than the GOP size, performing the next step, and if the GOP size is smaller than the cache size and smaller than 2 × GOP size, performing the eighth step; if the cache size is larger than 2 × GOP size, performing the step ten;
fourthly, dividing the cache into two caches which are respectively cache1 and cache 2;
fifthly, the detection cache1 can store several decoded video frames, and the number of the video frames is set as frame num;
sixthly, starting two decoding threads and one encoding thread;
seventhly, starting from the last GOP, alternately decoding frame num video frames by the two decoding threads, storing the frame num video frames into the corresponding cache1 and cache2, then sending the video frames in the cache1 and cache2 into the encoding threads in a reverse order for encoding until the last GOP is finished, and repeating the same operation until all the GOPs are finished;
eighthly, starting a decoding thread;
starting from the last GOP, caching the video frame of the last GOP into the cache by the decoding thread, and then sending the video frame in the cache into the encoding thread in a reverse order for encoding until all the GOPs are finished;
dividing the cache into two caches, namely cache A and cache B;
eleven, starting two decoding threads and one encoding thread;
and twelfth, starting from the last GOP, alternately decoding the video frames of the last GOP by the two decoding threads, storing the video frames into the corresponding cache A and cache B, then sending the video frames in the cache A and cache B into the encoding thread in a reverse order for encoding, and repeating the same operation until all the GOPs are finished.
In this embodiment, before the first step, the size of the remaining space of the mobile phone memory is detected, and then the cache size is set according to the size of the remaining space of the mobile phone memory.
In this embodiment, step seven specifically includes the following steps:
(7.1), the first decoding thread starts decoding from the last GOP and stores the frame num video frames of the last group of the GOP into the cache 1;
(7.2) sending the video frames in the cache1 to an encoding thread in a reverse order for encoding;
(7.3), the second decoding thread starts to decode from the last GOP and stores the second last frame num video frames of the GOP into the cache 2;
(7.4) sending the video frames of the cache2 into an encoding thread in a reverse order for encoding;
(7.5) the first decoding thread starts to decode the last-to-last group of frame num videos of the last GOP and feeds the videos into the encoder in the reverse order until all the video frames of the last GOP are finished;
(7.6) the second decoding thread starts to decode the fourth last group of frame num videos of the last GOP and feeds the videos into the encoder in the reverse order until all the video frames of the last GOP are finished;
(7.7), likewise, the video decoding and encoding work for the penultimate GOP begins until all GOPs are completed.
In this embodiment, in steps (7.2) and (7.4), after the encoding thread completes video encoding in the cache1 or the cache2, the cache1 or the cache2 is released.
In this embodiment, the ninth step specifically includes the following steps:
(9.1) starting a decoding thread to start decoding from the last GOP;
(9.2) caching the video frame of the last GOP into a cache;
(9.3) starting an encoding thread to encode, and transmitting the video frames in the cache into the encoding thread in a reverse order;
and (9.4) the decoding thread starts decoding and buffering the last-but-one GOP, and then the GOPs are sent to the encoding thread in a reverse order for encoding until all the GOPs are finished.
In this embodiment, in step (9.3), after all video frames in the cache are encoded, the cache is released.
In this embodiment, step twelve specifically includes the following steps:
(12.1), the first decoding thread starts to decode from the last GOP and stores the video frames of the GOP in cacheA;
(12.2) sending the video frames in the cacheA to an encoding thread in a reverse order for encoding;
(12.3) the second decoding thread starts to decode from the last GOP and stores the video frame of the GOP in the cache B;
(12.4) sending the video frames of the cache B into an encoding thread in a reverse order for encoding;
(12.5) similarly, the first decoding thread starts to decode the third last GOP, stores the decoded video frames in cacheA and sends the video frames to an encoder in the reverse order until all the GOPs are finished;
(12.6) similarly, the second decoding thread starts to decode the fourth last GOP, stores the decoded video frame in the cache B and sends the video frame to the encoder in the reverse order until all the GOPs are finished.
In this embodiment, in steps (12.2) and (12.4), the encoding thread completes video encoding in cache a or cache B, and releases cache a or cache B.
As shown in fig. 2, the present embodiment further provides a video rewinding system for a smart phone, which adopts the foregoing rewinding method, and includes:
the memory detection module is used for detecting the size of the residual space of the mobile phone memory;
the cache size setting module is connected with the memory detection module and used for setting cache size according to the size of the residual space of the mobile phone memory;
the GOP space detection module is used for detecting the space size GOP size of the maximum GOP of the video;
the comparison module is connected with the cache size setting module and the GOP space detection module and is used for comparing the cache size and the GOP size;
the first decoding module is connected with the comparison module and used for decoding when the cache size is smaller than the GOP size;
the decoding process of the first decoding module adopts the method in the seventh step;
the second decoding module is connected with the comparison module and used for decoding when the GOP size is smaller than the cache size and smaller than 2 GOP size;
the decoding process of the second decoding module adopts the method in the ninth step;
the third decoding module is connected with the comparison module and is used for decoding when the cache size is larger than 2 × GOP size;
the decoding process of the third decoding module adopts the method in the step twelve;
and the encoder is connected with the first decoding module, the second decoding module and the third decoding module and is used for receiving the video frames transmitted in the reverse order in the decoding process.
In the embodiment, the cache size and the GOP size are compared, different processing modes are selected according to the comparison result, when the cache size is smaller than the GOP size, the frame num which can store the decoded video frame is estimated firstly, then the two decoding threads decode the frame num of the last GOP in an alternating reverse order, and then all the GOPs are decoded in sequence from back to front; when the GOP size is less than the cache size and less than 2 × GOP size, one decoding thread directly decodes all the GOPs from back to front in sequence; when cache size > 2 × GOP size, the two decode threads alternately decode all GOPs in sequence from back to front.
The video reversing method can better obtain the reversed video, and has the advantages of very convenient operation, small time consumption and high user experience.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (9)
1. A video rewinding method for a smartphone, characterized by: the method comprises the following steps:
firstly, setting cache size;
secondly, detecting the space size GOP size of the maximum GOP of the video;
thirdly, comparing the cache size with the GOP size, if the cache size is smaller than the GOP size, performing the next step, and if the GOP size is smaller than the cache size and smaller than 2 × GOP size, performing the eighth step; if the cache size is larger than 2 × GOP size, performing the step ten;
fourthly, dividing the cache into two caches which are respectively cache1 and cache 2;
fifthly, the detection cache1 can store several decoded video frames, and the number of the video frames is set as frame num;
sixthly, starting two decoding threads and one encoding thread;
seventhly, starting from the last GOP, alternately decoding frame num video frames by the two decoding threads, storing the frame num video frames into the corresponding cache1 and cache2, then sending the video frames in the cache1 and cache2 into the encoding threads in a reverse order for encoding until the last GOP is finished, and repeating the same operation until all the GOPs are finished;
eighthly, starting a decoding thread;
starting from the last GOP, caching the video frame of the last GOP into the cache by the decoding thread, and then sending the video frame in the cache into the encoding thread in a reverse order for encoding until all the GOPs are finished;
dividing the cache into two caches, namely cache A and cache B;
eleven, starting two decoding threads and one encoding thread;
and twelfth, starting from the last GOP, alternately decoding the video frames of the last GOP by the two decoding threads, storing the video frames into the corresponding cache A and cache B, then sending the video frames in the cache A and cache B into the encoding thread in a reverse order for encoding, and repeating the same operation until all the GOPs are finished.
2. The video rewinding method for smart phones according to claim 1, characterized in that: before the first step, the size of the residual space of the mobile phone memory is detected, and then the cache size is set according to the size of the residual space of the mobile phone memory.
3. The video rewinding method for smart phones according to claim 1, characterized in that: step seven, the method specifically comprises the following steps:
(7.1), the first decoding thread starts decoding from the last GOP and stores the frame num video frames of the last group of the GOP into the cache 1;
(7.2) sending the video frames in the cache1 to an encoding thread in a reverse order for encoding;
(7.3), the second decoding thread starts to decode from the last GOP and stores the second last frame num video frames of the GOP into the cache 2;
(7.4) sending the video frames of the cache2 into an encoding thread in a reverse order for encoding;
(7.5) the first decoding thread starts to decode the last-to-last group of frame num videos of the last GOP and feeds the videos into the encoder in the reverse order until all the video frames of the last GOP are finished;
(7.6) the second decoding thread starts to decode the fourth last group of frame num videos of the last GOP and feeds the videos into the encoder in the reverse order until all the video frames of the last GOP are finished;
(7.7) the video decoding and encoding work for the penultimate GOP begins until all GOPs are completed.
4. A video rewinding method for smart phones according to claim 3, characterized in that: in the steps (7.2) and (7.4), after the encoding thread finishes encoding the video in the cache1 or the cache2, the cache1 or the cache2 is released.
5. The video rewinding method for smart phones according to claim 1, characterized in that: in the ninth step, the method specifically comprises the following steps:
(9.1) starting a decoding thread to start decoding from the last GOP;
(9.2) caching the video frame of the last GOP into a cache;
(9.3) starting an encoding thread to encode, and transmitting the video frames in the cache into the encoding thread in a reverse order;
and (9.4) the decoding thread starts decoding and buffering the last-but-one GOP, and then the GOPs are sent to the encoding thread in a reverse order for encoding until all the GOPs are finished.
6. The video rewinding method for smart phones according to claim 5, characterized in that: and (9.3) releasing the cache after all video frames in the cache are encoded.
7. The video rewinding method for smart phones according to claim 1, characterized in that: in the twelfth step, the method specifically comprises the following steps:
(12.1), the first decoding thread starts to decode from the last GOP and stores the video frames of the GOP in cacheA;
(12.2) sending the video frames in the cacheA to an encoding thread in a reverse order for encoding;
(12.3) the second decoding thread starts to decode from the last GOP and stores the video frame of the GOP in the cache B;
(12.4) sending the video frames of the cache B into an encoding thread in a reverse order for encoding;
(12.5) the first decoding thread starts to decode the third last GOP, stores the decoded video frames in cacheA and sends the video frames to an encoder in the reverse order until all the GOPs are finished;
(12.6) the second decoding thread starts to decode the fourth last GOP, stores the decoded video frame in the cache B and sends the video frame to the encoder in the reverse order until all the GOPs are finished.
8. The video rewinding method for smart phones according to claim 7, characterized in that: in the steps (12.2) and (12.4), the encoding thread completes video encoding in the cache A or the cache B, and releases the cache A or the cache B.
9. A video rewind system for a smartphone characterized by: the method comprises the following steps:
the memory detection module is used for detecting the size of the residual space of the mobile phone memory;
the cache size setting module is connected with the memory detection module and used for setting cache size according to the size of the residual space of the mobile phone memory;
the GOP space detection module is used for detecting the space size GOP size of the maximum GOP of the video;
the comparison module is connected with the cache size setting module and the GOP space detection module and is used for comparing the cache size and the GOP size;
the first decoding module is connected with the comparison module and used for decoding when the cache size is smaller than the GOP size;
the second decoding module is connected with the comparison module and used for decoding when the GOP size is smaller than the cache size and smaller than 2 GOP size;
the third decoding module is connected with the comparison module and is used for decoding when the cache size is larger than 2 × GOP size;
and the encoder is connected with the first decoding module, the second decoding module and the third decoding module and is used for receiving the video frames transmitted in the reverse order in the decoding process.
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