CN102014286B - Video coding and decoding method and device - Google Patents
Video coding and decoding method and device Download PDFInfo
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Abstract
The invention provides a video coding and decoding method and device. The method provided by the invention comprises the following steps: 1, receiving a feedback real time control protocol (RTCP) message packet; 2, acquiring a packet loss ratio; 3, computing reference frames: firstly, dividing P frames into P* frames and P' frames: (a) enabling each P' frame to select a P frame which is in front of the P' frame and in the same group of pictures (GOP) as a reference frame; and and (b) computing all P* frames and corresponding reference frames of the P* frames in one GOP according to the preset cross rules corresponding to different packet loss ratios, wherein the cross rules meet the following promise: the cross degree is increased with the increase of the packet loss ratio; 4, coding according to the acquired reference frames; and 5, outputting and displaying after decoding, and feeding back the RTCP message packet. The method and the device provided by the invention can dynamically select the reference frames of the P frames, have no need of always using the previous P frame as a reference frame, and can improve the fluency and the quality of videos as much as possible under the unstable network condition.
Description
Technical field
The present invention relates to video coding and decoding technology, particularly a kind of video coding-decoding method and device.
Background technology
At present; Utilize RTP (Real-time Transport Protocol; Real time transport protocol) carrying out real-time video transmission is the method that industry is the most generally used, but because RTP is based on UDP's (User Datagram Protocol, User Datagram Protocol); It provides simple insecure data delivery service, therefore the Network Packet Loss phenomenon can often occur inevitably.In case the packet loss phenomenon takes place, the processing method that adopts usually at present has following two kinds: continue to send data or stop to send data.If adopt first method, continue follow-up video data is sent into decoder decode and shown that at this moment image has motion, but occur the phenomenon of mosaic probably; If adopt second method in addition, promptly temporarily stop the reception or the decoding of follow-up influenced data, though so mosaic phenomenon can not occur, owing to transfer of data has stopped, so video also just has of short duration pause.
A GOP (Group of Pictures, picture group) is exactly one group of continuous picture, and mpeg encoded is divided into three kinds of I, P, B with picture (being frame), and I is an intra-coded frame, and P is a forward predicted frame, and B is two-way interpolation frame.If carry out real-time video transmission, only need use IDR frame and the two kinds of frame types of P frame in the I frame, wherein; The IDR frame uses intraframe predictive coding; It need not depend on other any frame, H.264 can regularly produce the IDR frame in the standard, under the situation of video packet loss, can be used for synchronous images; The P frame utilizes forward predictive coded; Code efficiency and compression ratio are all high than IDR frame; But the P frame need use and be in the same GOP and for referencial use coding of P frame before it; If current P LOF causes the decoding deviation of follow-up P frame probably, thereby cause the appearance of mosaic phenomenon.(if the packet loss phenomenon promptly takes place) in this case must wait until that the appearance of IDR frame could synchronous images.
Summary of the invention
For addressing the above problem; The present invention provides a kind of video coding-decoding method and device; Reference frame that can Dynamic Selection P frame, the P frame before not needing always to utilize is frame as a reference, under unsettled network condition, can improve the fluency and the quality of video as much as possible.
A kind of video coding-decoding method of the present invention may further comprise the steps:
Step S1 receives feedback RTCP message bag;
Step S2 obtains packet loss according to RTCP message bag;
Step S3 calculates reference frame, at first the P frame is divided into P* frame and P ' frame:
A), each P ' frame is chosen in before this P ' frame and the frame as a reference of the P frame within same picture group GOP;
B), the selection of the reference frame of P* frame is specific as follows:
According to the pairing leap rule of predefined different packet loss, calculate the reference frame of the P* frame of all interior P* frames of a picture group GOP and correspondence, above-mentioned leap rule is followed following agreement: the degree of leap increases along with the increase of packet loss;
Said leap rule is specific as follows:
When 0% ≤x < 5%: F={i|0 <i < N, and i Mod 3=0}, and M=i-3;
When 5% ≤x < 10%: F={i|0 <i < N, and i Mod 5=0}, and M=i-5;
When 10% ≤x < 15%: F={i|0 <i < N, and i Mod 7=0}, and M=i-7;
When 15% ≤x < 20%: F={i|0 <i < N, and i Mod 9=0}, and M=i-9;
When 20% ≤x: F={i|0 <i < N, and i Mod 11=0}, and M=i-11;
Wherein, N representes the length of a picture group GOP, and x representes the size of said packet loss, and F representes the frame number set of said P* frame, and M representes the frame number of said P* frame corresponding reference frame;
Step S4 encodes according to the reference frame that obtains among the step S3;
Step S5 carries out exporting demonstration behind the decode operation, and feedback RTCP message bag.
The present invention also provides a kind of video encoding/decoding apparatus, comprises coding side and decoding end;
Coding side is used to receive the feedback RTCP message bag of decoding end, obtains packet loss, calculates reference frame according to pre-defined rule, behind the coding data is sent; The process of calculating reference frame according to pre-defined rule is specific as follows: the P frame is divided into P* frame and P ' frame: a), each P ' frame is chosen in before this P ' frame and the frame as a reference of the P frame within same picture group GOP; B); According to the pairing leap rule of predefined different packet loss; Calculate the reference frame of the P* frame of all interior P* frames of a picture group GOP and correspondence, above-mentioned leap rule is followed following agreement: the degree of leap increases along with the increase of packet loss; Said leap rule is specific as follows:
When 0% ≤x < 5%: F={i|0 <i < N, and i Mod 3=0}, and M=i-3;
When 5% ≤x < 10%: F={i|0 <i < N, and i Mod 5=0}, and M=i-5;
When 10% ≤x < 15%: F={i|0 <i < N, and i Mod 7=0}, and M=i-7;
When 15% ≤x < 20%: F={i|0 <i < N, and i Mod 9=0}, and M=i-9;
When 20% ≤x: F={i|0 <i < N, and i Mod 11=0}, and M=i-11;
Wherein, N representes the length of a picture group GOP, and x representes the size of said packet loss, and F representes the frame number set of said P* frame, and M representes the frame number of said P* frame corresponding reference frame;
Decoding end is used for the data that receive are carried out exporting demonstration behind the decode operation, and feedback RTCP message bag is given coding side.
Can find out from above scheme; Because reference frame is taked the mechanism of crossing over forward in various degree according to the quality of network condition; The P frame no longer all utilize in the same GOP and the P frame before its as a reference frame therefore effectively reduce because the decoding deviation of losing the follow-up P frame that is caused of current P frame so that the probability of mosaic phenomenon occurs to encode; And the degree that the forward direction of reference frame is crossed over increases along with the increase of packet loss, has increased the recovery probability of packet loss.In addition, after the packet loss phenomenon takes place, also needn't solve the application limitation of P frame to a certain extent again according to the appearance ability synchronous images that generally must wait until the IDR frame.And video coding-decoding method of the present invention and device, can effectively strengthen the performance of the anti-packet loss of code stream, under the unsettled network bandwidth, can improve video fluency and quality as much as possible.
Description of drawings
Fig. 1 is a kind of video coding-decoding method flow chart of the present invention;
Fig. 2 is the example schematic of Dynamic Selection P reference frame in the embodiment.
Embodiment
The invention provides a kind of video coding-decoding method and device; Can solve P frame in the existing video coding and decoding technology and always need be utilized in P frame frame for referencial use before its encoding, so that the problem of the decoding deviation of losing the follow-up P frame that possibly cause of current P frame.
Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing, be illustrated in figure 1 as a kind of process chart of video coding-decoding method.
Step S 1, owing to use Real-time Transport Protocol to come transmission of video, coding side can be received the feedback RTCP message bag from decoding end so, and RTCP message bag type mainly contains:
SR: send report, current active sender sends, receiving and counting;
RR: receive report, non-movable sender's receiving and counting;
SDES: the Source Description item comprises CNAME;
BYE: expression finishes;
APP: use specific function.
Here used the RR message bag from decoding end, and we can draw receivable packet of decoding end and the actual information of receiving packet from the message bag.
Step S2, according to receivable packet and the real packet loss of receiving the current decoding end of information calculations of packet in the feedback RTCP message bag, concrete formula is following: (receivable packet-reality is received packet)/receivable packet * 100%.
Step S3, the position (being sequence number) of calculating all reference frames in the GOP.For convenience; Wherein a kind of P frame of our definition is the P* frame; All P frames of except the P* frame other are called P ' frame, and P ' frame selects the method for reference frame identical with prior art, promptly be chosen in this P ' frame before and the frame as a reference of the P frame in same GOP; If but the P frame always is utilized in P frame frame for referencial use before its to encode, can cause the decoding deviation of the follow-up P frame that losing of current P frame possibly cause.Therefore the present invention introduces the probability of P* frame, and a kind of method of reference frame of Dynamic Selection P* frame is provided, and the selection course of the reference frame of P* frame is specific as follows:
According to the pairing leap rule of predefined different packet loss, calculate the reference frame of the P* frame of all interior P* frames of a GOP and correspondence, above-mentioned leap rule is followed following agreement: the degree of leap increases along with the increase of packet loss.
As an embodiment preferably, satisfy it under the prerequisite of mandatory rule, above-mentioned leap rule can be provided with as follows:
When 0% ≤x < 5%: F={i|0 <i < N, and i Mod 3=0}, and M=i-3;
When 5% ≤x < 10%: F={i|0 <i < N, and i Mod 5=0}, and M=i-5;
When 10% ≤x < 15%: F={i|0 <i < N, and i Mod 7=0}, and M=i-7;
When 15% ≤x < 20%: F={i|0 <i < N, and i Mod 9=0}, and M=i-9;
When 20% ≤x: F={i|0 <i < N, and i Mod 11=0}, and M=i-11;
Wherein, N representes the length of a GOP, and x representes the size of packet loss, and F representes the frame number set of P* frame, and M representes the frame number of P* frame corresponding reference frame.
For example; The size of the packet loss of supposing to obtain among the step S2 is 5%, and the GOP length N is 30, and promptly x drops on [5%; 10%) this interval; According to above-mentioned formula, the frame preface that can calculate the appearance of P* frame is 5,10,15,20,25, and the frame number M of the pairing reference frame of corresponding P* frame is: 0,5,10,15,20.
If the size of packet loss x is 16%, and the length of GOP still N be 30, can know that x drops on [15%; 20%) this interval; According to above-mentioned formula, the frame number that can calculate the appearance of P* frame is 9,18,27, and the frame number M of the pairing reference frame of corresponding P* frame is: 0,9,18.
By on can know; The leap rule that the present invention sets is a mechanism of taking reference frame to cross over forward in various degree according to the quality of network condition; And the degree that the forward direction of reference frame is crossed over increases along with the increase of packet loss, and being provided with like this is in order effectively to increase the recovery probability of packet loss.
Step S4 encodes according to the reference frame that gets access to.As shown in Figure 2, the 0th frame is the IDR frame, carries out intraframe predictive coding, need not reference frame; The 1st frame to the 4 frames all are P ' frame, and the reference frame of use all points to former frame, and the 5th frame is the P* frame, and the reference frame of use is the 0th frame, i.e. the IDR frame.The 6th frame to the 8 frames all are P ' frame; The reference frame that uses all points to former frame; The 9th frame is the P* frame; Use the 5th frame frame as a reference ... In the present embodiment, on behalf of the H.264 standard of one of video code model of state-of-the-art, employing encode, and the intact frame of every volume just is transferred to decoding end with data through Real-time Transport Protocol.
Step S5, output showed after decoding end was carried out decode operation, and feedback RTCP message bag is to coding side, so that coding side can in time adjust accordingly.
The present invention also provides a kind of video encoding/decoding apparatus, comprises coding side and decoding end;
The function of coding side is the feedback RTCP message bag that receives decoding end, obtains packet loss, calculates reference frame according to pre-defined rule, behind the coding data is sent; The process of calculating reference frame according to pre-defined rule is specific as follows: the P frame is divided into P* frame and P ' frame: a), each P ' frame is chosen in before this P ' frame and the frame as a reference of the P frame within same GOP; B), according to the pairing leap rule of predefined different packet loss, calculate the reference frame of the P* frame of all interior P* frames of a GOP and correspondence, above-mentioned leap rule is followed following agreement: the degree of leap increases along with the increase of packet loss.
The function of decoding end is that output showed after the data that receive were carried out decode operation, and feedback RTCP message bag is given coding side.
Can find out through such scheme; Because reference frame can be taked the mechanism of crossing over forward in various degree according to the quality of current network conditions; The P frame no longer all utilize in the same GOP and the P frame before its as a reference frame therefore effectively reduce because the decoding deviation of losing the follow-up P frame that is caused of current P frame so that the probability of mosaic phenomenon occurs to encode; And the degree that the forward direction of reference frame is crossed over increases along with the increase of packet loss, has increased the recovery probability of packet loss.In addition; When the packet loss phenomenon takes place after; Even if promptly packet loss appears in the P frame before the reference frame, as long as correctly receiving the back, reference frame just can continue displaying video, so just needn't be again according to generally having waited until the appearance ability synchronous images of IDR frame; Solved the application limitation of P frame to a certain extent, made the range of application of P frame in Network Transmission wider.And video coding-decoding method of the present invention and device, owing to adopt the method for Dynamic Selection reference frame, can effectively strengthen the performance of the anti-packet loss of code stream, under the unsettled network bandwidth, can improve video fluency and quality as much as possible.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection range of the present invention.
Claims (4)
1. a video coding-decoding method is characterized in that, may further comprise the steps:
Step S1 receives feedback RTCP message bag;
Step S2 obtains packet loss according to said RTCP message bag;
Step S3 calculates reference frame, at first the P frame is divided into P* frame and P ' frame:
A), said each P ' frame is chosen in before this P ' frame and the frame as a reference of the P frame within same picture group GOP;
B), the selection of the reference frame of said P* frame is specific as follows:
According to the pairing leap rule of predefined different packet loss; Calculate the reference frame of the P* frame of all interior P* frames of a picture group GOP and correspondence, said leap rule is followed following agreement: the degree of leap increases along with the increase of said packet loss;
Said leap rule is specific as follows:
When 0% ≤x < 5%: F={i|0 <i < N, and i Mod 3=0}, and M=i-3;
When 5% ≤x < 10%: F={i|0 <i < N, and i Mod 5=0}, and M=i-5;
When 10% ≤x < 15%: F={i|0 <i < N, and i Mod 7=0}, and M=i-7;
When 15% ≤x < 20%: F={i|0 <i < N, and i Mod 9=0}, and M=i-9;
When 20% ≤x: F={i|0 <i < N, and i Mod 11=0}, and M=i-11;
Wherein, N representes the length of a picture group GOP, and x representes the size of said packet loss, and F representes the frame number set of said P* frame, and M representes the frame number of said P* frame corresponding reference frame;
Step S4 encodes according to the reference frame that obtains among the step S3;
Step S5 carries out exporting demonstration behind the decode operation, and feeds back said RTCP message bag.
2. video coding-decoding method according to claim 1; It is characterized in that; Step S2 is specially: comprise receivable packet and the real information of receiving packet in the said RTCP message bag, the said formula that obtains packet loss is following: (receivable packet-reality received packet)/packet * 100% should collect.
3. video coding-decoding method according to claim 1 is characterized in that, adopts H.264 standard to encode among the step S4.
4. a video encoding/decoding apparatus is characterized in that, comprises coding side and decoding end;
Said coding side is used to receive the feedback RTCP message bag of said decoding end, obtains packet loss, calculates reference frame according to predetermined rule, behind the coding data is sent; The detailed process of calculating reference frame according to said rule is following: the P frame is divided into P* frame and P ' frame: a), said each P ' frame is chosen in before this P ' frame and the frame as a reference of the P frame within same picture group GOP; B); According to the pairing leap rule of predefined different packet loss; Calculate the reference frame of the P* frame of all interior P* frames of a picture group GOP and correspondence, said leap rule is followed following agreement: the degree of leap increases along with the increase of said packet loss; Said leap rule is specific as follows:
When 0% ≤x < 5%: F={i|0 <i < N, and i Mod 3=0}, and M=i-3;
When 5% ≤x < 10%: F={i|0 <i < N, and i Mod 5=0}, and M=i-5;
When 10% ≤x < 15%: F={i|0 <i < N, and i Mod 7=0}, and M=i-7;
When 15% ≤x < 20%: F={i|0 <i < N, and i Mod 9=0}, and M=i-9;
When 20% ≤x: F={i|0 <i < N, and i Mod 11=0}, and M=i-11;
Wherein, N representes the length of a picture group GOP, and x representes the size of said packet loss, and F representes the frame number set of said P* frame, and M representes the frame number of said P* frame corresponding reference frame;
Said decoding end is used for said data are carried out exporting demonstration behind the decode operation, and feeds back said RTCP message bag.
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| CN103152576B (en) * | 2013-03-21 | 2016-10-19 | 浙江宇视科技有限公司 | A kind of it is applicable to the anti-dropout Video coding of multicast and decoding apparatus |
| CN104301064B (en) * | 2013-07-16 | 2018-05-04 | 华为技术有限公司 | Handle the method and decoder of lost frames |
| CN104683823A (en) * | 2013-11-29 | 2015-06-03 | 红板凳科技股份有限公司 | Multi-screen linked audio and video synchronizing system |
| WO2018121775A1 (en) | 2016-12-30 | 2018-07-05 | SZ DJI Technology Co., Ltd. | System and methods for feedback-based data transmission |
| CN109936746B (en) | 2016-12-30 | 2021-07-16 | 深圳市大疆创新科技有限公司 | Image processing method and apparatus |
| WO2018120198A1 (en) * | 2016-12-30 | 2018-07-05 | 深圳市大疆创新科技有限公司 | Image processing method and device, unmanned aerial vehicle and receiving end |
| CN108667563B (en) * | 2018-01-19 | 2021-05-11 | 唐桥科技(杭州)有限公司 | Method and device for acquiring number of forward error correction packets |
| CN110166776B (en) * | 2018-02-11 | 2023-08-04 | 腾讯科技（深圳）有限公司 | Video encoding method, device and storage medium |
| CN111953978A (en) * | 2020-07-07 | 2020-11-17 | 西安万像电子科技有限公司 | Frame rate control method, device and storage medium |
| CN113573063A (en) * | 2021-06-16 | 2021-10-29 | 百果园技术(新加坡)有限公司 | Video coding and decoding method and device |
| CN115706835A (en) * | 2021-08-06 | 2023-02-17 | 腾讯科技（深圳）有限公司 | Data transmission method and related device |
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Address after: 510670 Guangdong city of Guangzhou province Kezhu Guangzhou high tech Industrial Development Zone, Road No. 233 Patentee after: Wei Chong group Limited by Share Ltd Address before: 510663 Guangzhou province high tech Industrial Development Zone, Guangdong, Cai road, No. 6, No. Patentee before: Guangdong Weichuangshixun Science and Technology Co., Ltd. |
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