CN102752670A - Method, device and system for reducing phenomena of mosaics in network video transmission - Google Patents
Method, device and system for reducing phenomena of mosaics in network video transmission Download PDFInfo
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Abstract
The invention provides a method, device and system for reducing phenomena of mosaics in network video transmission. The method comprises the following steps of: searching a key frame from a local cache according to the sequence of frames after a receiving end finds that a video data packet is lost; judging whether the corresponding key frame is searched; if the key frame is found, directly transmitting the searched key frame to a decoder to be decoded; and if the key frame is not found, transmitting a request for obtaining a key frame to a transmitting end through the receiving end, and then receiving the key frame in a coding manner from the transmitting end, and transmitting the key frame to the decoder to be decoded. According to the method, device and system provided by the invention, in a network video transmission process, when finding that the video data packet is lost, the receiving end instantly sends the request of sending the key frame to the receiving end to the transmitting end, and the receiving end receives the key frame and then transmits the key frame to the decoder to be decoded, therefore, the phenomena of mosaics cannot be generated, therefore, the quality of the network video transmission is greatly improved, and the effect on viewing a video is effectively improved.
Description
Technical field
The present invention relates to the video coding and decoding technology field, particularly relate to a kind of method of mosaic phenomenon in the Network Video Transmission, a kind of device and a kind of system that reduces mosaic phenomenon in the Network Video Transmission that reduces mosaic phenomenon in the Network Video Transmission of reducing.
Background technology
At present; In traditional network video transmission method; The UDP (User Datagram Protocol, User Datagram Protocol) or RTP (Real-time Transport Protocol, the RTP) video data that generally receive Network Transmission by receiving terminal are at local cache; (by concrete software decision) sends to Video Decoder and decodes after being cached to some.Except that key frame, the video decoder decodes video data all need be with reference to the reference frame of front and back.
In the Network Video Transmission process; If receiving terminal is owing to packet loss has taken place some video data of reason of network; If at this moment also from buffer memory, reading the video data relevant with the packet loss video data sends in the decoder and decodes; Because therefore decoder decode will will produce the phenomenon of mosaic with reference to the video data information of packet loss, mosaic phenomenon appears in video can greatly influence viewing effect.For example under the unsettled situation of network state, have a meeting with video conferencing system at a meeting room, often see the video display screen curtain often fuzzy picture arranged, this mosaic phenomenon is bound to influence the effect of meeting.
Summary of the invention
For addressing the above problem, the present invention provides a kind of method, Apparatus and system that reduces mosaic phenomenon in the Network Video Transmission, can reduce the mosaic phenomenon in the Network Video Transmission, thereby can effectively improve the quality of Network Video Transmission.
A kind of method that reduces mosaic phenomenon in the Network Video Transmission may further comprise the steps:
Receiving terminal is searched a key frame by frame sequential after finding the video data packet loss from local cache;
Judge whether to find corresponding key frame;
Be then directly the key frame that finds to be sent to decoder and decode if be judged as;
If be not judged as not, then said receiving terminal is to key frame of transmitting terminal request, and after receiving the key frame that said transmitting terminal coding sends over, and this key frame sent in the decoder decode.
A kind of device that reduces mosaic phenomenon in the Network Video Transmission comprises:
Search module, be used to find the video data packet loss after, from local cache, search a key frame by frame sequential;
Judge module is used to judge whether to find corresponding key frame;
First sending module is used for having found corresponding key frame when said judge module judgement, then directly the key frame that finds is sent to decoder and decodes;
Second sending module is used for judging when said judge module and does not find corresponding key frame, then to key frame of transmitting terminal request, and after receiving the key frame that said transmitting terminal coding sends over, this key frame is sent in the decoder decode.
A kind of system that reduces mosaic phenomenon in the Network Video Transmission comprises transmitting terminal, receiving terminal, and said receiving terminal comprises searches module, judge module, first sending module and second sending module, and said transmitting terminal comprises: the 3rd sending module;
Said searching after module is used to find the video data packet loss searched a key frame by frame sequential from local cache;
Said judge module is used to judge whether to find corresponding key frame;
Said first sending module is used for having found corresponding key frame when said judge module judgement, then directly the key frame that finds is sent to decoder and decodes;
Said second sending module is used for not finding corresponding key frame when said judge module judgement; Then to key frame of said the 3rd sending module request; And after receiving the key frame that said the 3rd sending module coding sends over, this key frame sent in the decoder decode;
Said the 3rd sending module is used for the request according to said second sending module transmission, and by key frame of encoder encodes, the key frame that will encode then sends to said second sending module.
Can find out from such scheme; Method, the Apparatus and system of mosaic phenomenon in the minimizing Network Video Transmission of the present invention, in the Network Video Transmission process, receiving terminal is found no longer to send into decoder decode to the video data relevant with the video data of packet loss when video data has packet loss; Give receiving terminal but send a key frame to the transmitting terminal request immediately; Receiving terminal has received that beginning to send into decoder again behind the key frame decodes, and does not so just have the appearance of mosaic phenomenon, has greatly improved the quality of Network Video Transmission; Effectively improve the effect of video-see, had better market application.
Description of drawings
Fig. 1 is a kind of schematic flow sheet that reduces the method for mosaic phenomenon in the Network Video Transmission of the present invention;
Fig. 2 is a kind of structural representation that reduces the device of mosaic phenomenon in the Network Video Transmission of the present invention;
Fig. 3 is a kind of structural representation that reduces the system of mosaic phenomenon in the Network Video Transmission of the present invention.
Embodiment
The present invention provides a kind of method, Apparatus and system that reduces mosaic phenomenon in the Network Video Transmission, can reduce the mosaic phenomenon in the Network Video Transmission, effectively improves the quality of Network Video Transmission.Below in conjunction with accompanying drawing and concrete embodiment, technical scheme of the present invention is done further to describe.
Referring to shown in Figure 1, a kind of method that reduces mosaic phenomenon in the Network Video Transmission may further comprise the steps:
Step S101, in the process of Network Video Transmission, transmitting terminal sends to receiving terminal after with video data encoding and is decoded by receiving terminal.Under the unsettled situation of network state, packet loss might take place in some video data, and receiving terminal is searched a key frame by frame sequential after finding the video data packet loss from local cache.
Step S102 judges whether to find corresponding key frame; Be then get into step S103 if be judged as, otherwise get into step S104.
Step S103; If be judged as is (in buffer memory, having found key frame); Then directly the key frame that finds being sent to decoder decodes (because the decoding key frame does not need reference frame); Therefore because key frame does not have packet loss, the phenomenon of mosaic can not appear in the video that comes out of decoding, and then flow process can leave it at that.
As an embodiment preferably, judge found corresponding key frame after, the key frame that finds sent to before decoder decodes, can also comprise step S1031: delete video data relevant in the said buffer memory with the packet loss video data.
Step S104, if be judged as not (in buffer memory, not finding key frame), then said receiving terminal is to key frame of transmitting terminal request, and after receiving the key frame that said transmitting terminal coding sends over, and this key frame sent in the decoder decode.
As an embodiment preferably, judge do not find corresponding key frame after, before key frame of transmitting terminal request, can also comprise step S1041: clear up the video data in the said buffer memory.
As an embodiment preferably; Above-mentioned receiving terminal after key frame of transmitting terminal request, receive the key frame that said transmitting terminal coding sends over before; Can also comprise step S1042: said transmitting terminal receives the request that said receiving terminal sends; And according to the request of receiving terminal, by key frame of encoder encodes, the key frame that will encode then sends to said receiving terminal.
Corresponding with above-mentioned a kind of method of mosaic phenomenon that reduces in the Network Video Transmission, the present invention also provides a kind of device that reduces mosaic phenomenon in the Network Video Transmission, and is as shown in Figure 2, comprising:
Search module (101), be used to find the video data packet loss after, from local cache, search a key frame by frame sequential;
Judge module (102) is used to judge whether to find corresponding key frame;
First sending module (103) is used for having found corresponding key frame when said judge module (102) judgement, then directly the key frame that finds is sent to decoder and decodes;
Second sending module (104); Be used for not finding corresponding key frame when said judge module (102) judgement; Then to key frame of transmitting terminal request, and after receiving the key frame that said transmitting terminal coding sends over, this key frame sent in the decoder decode.
As an embodiment preferably; Can comprise the first data cached removing module in said first sending module (103); Be used for said judge module (102) judge find corresponding key frame after, before said first sending module (103) sends to decoder with the key frame that finds, delete video data relevant in the said buffer memory with the packet loss video data.
In addition; Can comprise the second data cached removing module in said second sending module (104); Be used for said judge module (102) judge do not find corresponding key frame after, said second sending module (104) before key frame of transmitting terminal request, clear up the video data in the said buffer memory.
Other technical characterictic of a kind of device that reduces mosaic phenomenon in the Network Video Transmission of the present invention and above-mentioned a kind of method of mosaic phenomenon that reduces in the Network Video Transmission are identical, do not repeat them here.
In addition; Corresponding with above-mentioned a kind of method that reduces mosaic phenomenon in the Network Video Transmission, device; The present invention also provides a kind of system that reduces mosaic phenomenon in the Network Video Transmission, and is as shown in Figure 3, comprises receiving terminal (1), transmitting terminal (2); Said receiving terminal comprises searches module (101), judge module (102), first sending module (103) and second sending module (104), and said transmitting terminal comprises: the 3rd sending module (201);
Said searching after module (101) is used to find the video data packet loss searched a key frame by frame sequential from local cache;
Said judge module (102) is used to judge whether to find corresponding key frame;
Said first sending module (103) is used for having found corresponding key frame when said judge module judgement, then directly the key frame that finds is sent to decoder and decodes;
Said second sending module (104) is used for not finding corresponding key frame when said judge module (102) judgement; Then to key frame of said the 3rd sending module (201) request; And after receiving the key frame that said the 3rd sending module (201) coding sends over, this key frame sent in the decoder decode;
Said the 3rd sending module (201) is used for the request according to said second sending module (104) transmission, and by key frame of encoder encodes, the key frame that will encode then sends to said second sending module (104).
As an embodiment preferably, said receiving terminal (1) can also comprise decoder, is used for according to the key frame decode video data.
As an embodiment preferably, said transmitting terminal (2) can also comprise encoder, and said key frame is used to encode.
Other technical characterictic of a kind of system that reduces mosaic phenomenon in the Network Video Transmission of the present invention and above-mentioned a kind of method, device that reduces mosaic phenomenon in the Network Video Transmission are identical, do not repeat them here.
Can find out through such scheme; Method, the Apparatus and system of mosaic phenomenon in the minimizing Network Video Transmission of the present invention, in the Network Video Transmission process, receiving terminal is found no longer to send into decoder decode to the video data relevant with the video data of packet loss when video data has packet loss; Give receiving terminal but send a key frame to the transmitting terminal request immediately; Receiving terminal has received that beginning to send into decoder again behind the key frame decodes, and does not so just have the appearance of mosaic phenomenon, has greatly improved the quality of Network Video Transmission; Effectively improve the effect of video-see, had better market application.
Above-described embodiment of the present invention, it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. a method that reduces mosaic phenomenon in the Network Video Transmission is characterized in that, may further comprise the steps:
Receiving terminal is searched a key frame by frame sequential after finding the video data packet loss from local cache;
Judge whether to find corresponding key frame;
Be then directly the key frame that finds to be sent to decoder and decode if be judged as;
If be not judged as not, then said receiving terminal is to key frame of transmitting terminal request, and after receiving the key frame that said transmitting terminal coding sends over, and this key frame sent in the decoder decode.
2. the method for mosaic phenomenon in the minimizing Network Video Transmission according to claim 1; It is characterized in that; Said receiving terminal after key frame of transmitting terminal request, receive before the key frame that said transmitting terminal coding sends over; Also comprise step: said transmitting terminal is according to the request of receiving terminal, and by key frame of encoder encodes, the key frame that will encode then sends to said receiving terminal.
3. the method for mosaic phenomenon in the minimizing Network Video Transmission according to claim 1 and 2; It is characterized in that; Judge find corresponding key frame after, the key frame that finds sent to decoder before, also comprise step: delete video data relevant in the said buffer memory with the packet loss video data.
4. the method for mosaic phenomenon in the minimizing Network Video Transmission according to claim 1 and 2; It is characterized in that; Judge do not find corresponding key frame after, before key frame of transmitting terminal request, also comprise step: clear up the video data in the said buffer memory.
5. a device that reduces mosaic phenomenon in the Network Video Transmission is characterized in that, comprising:
Search module, be used to find the video data packet loss after, from local cache, search a key frame by frame sequential;
Judge module is used to judge whether to find corresponding key frame;
First sending module is used for having found corresponding key frame when said judge module judgement, then directly the key frame that finds is sent to decoder and decodes;
Second sending module is used for judging when said judge module and does not find corresponding key frame, then to key frame of transmitting terminal request, and after receiving the key frame that said transmitting terminal coding sends over, this key frame is sent in the decoder decode.
6. the device of mosaic phenomenon in the minimizing Network Video Transmission according to claim 5; It is characterized in that; Said first sending module comprises the first data cached removing module; Be used for said judge module judge find corresponding key frame after, before said first sending module sends to decoder with the key frame that finds, delete video data relevant in the said buffer memory with the packet loss video data.
7. the device of mosaic phenomenon in the minimizing Network Video Transmission according to claim 5; It is characterized in that; Said second sending module comprises the second data cached removing module; Be used for said judge module judge do not find corresponding key frame after, said second sending module before key frame of transmitting terminal request, clear up the video data in the said buffer memory.
8. system that reduces mosaic phenomenon in the Network Video Transmission; Comprise transmitting terminal, receiving terminal; It is characterized in that said receiving terminal comprises searches module, judge module, first sending module and second sending module, said transmitting terminal comprises: the 3rd sending module;
Said searching after module is used to find the video data packet loss searched a key frame by frame sequential from local cache;
Said judge module is used to judge whether to find corresponding key frame;
Said first sending module is used for having found corresponding key frame when said judge module judgement, then directly the key frame that finds is sent to decoder and decodes;
Said second sending module is used for not finding corresponding key frame when said judge module judgement; Then to key frame of said the 3rd sending module request; And after receiving the key frame that said the 3rd sending module coding sends over, this key frame sent in the decoder decode;
Said the 3rd sending module is used for the request according to said second sending module transmission, and by key frame of encoder encodes, the key frame that will encode then sends to said second sending module.
9. the system of mosaic phenomenon is characterized in that in the minimizing Network Video Transmission according to claim 8, and said receiving terminal also comprises decoder, is used for according to the key frame decode video data.
10. the system of mosaic phenomenon is characterized in that in the minimizing Network Video Transmission according to claim 9, and said transmitting terminal also comprises encoder, and said key frame is used to encode.
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