CN206908759U - A kind of video multicast packet loss retransmission system - Google Patents
A kind of video multicast packet loss retransmission system Download PDFInfo
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- CN206908759U CN206908759U CN201720688499.9U CN201720688499U CN206908759U CN 206908759 U CN206908759 U CN 206908759U CN 201720688499 U CN201720688499 U CN 201720688499U CN 206908759 U CN206908759 U CN 206908759U
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Abstract
The utility model discloses a kind of video multicast packet loss retransmission system, including：Signal bit stream source, live telecast signal bit stream is sent to transmission network and packet loss retransmission server；Transmission network, receive the signal bit stream that signal bit stream source is sent and transmit to set top box, the packet loss repeat requests that set top box is sent to packet loss retransmission server, the re-transmission packet that transmission packet loss retransmission server is sent to set top box；Set top box, signal bit stream is received, judge whether packet loss, confirm packet loss sequence number, send packet loss repeat requests to packet loss retransmission server；Packet loss retransmission server, the signal bit stream source received is buffered, receive packet loss repeat requests, send lost data packets to set top box.Due to packet loss retransmission server be present, the packet that set top box is lost can be retransmitted, and solving existing Video Multicast System can not be transmitted again to the packet of loss, cause video playback mosaic and interim card to be present, the problem of influenceing Consumer's Experience.
Description
Technical field
It the utility model is related to a kind of Video Multicast System, more particularly to a kind of video multicast packet loss retransmission system.
Background technology
In current live television programs transmission, live telecast vision signal is converted into being based on UDP by television headend system
RTP transport multicasts in agreement, CHINA RFTCOM Co Ltd are responsible for the television signal transmission front end system into user family, and user passes through machine
The mode of top box incoming multicast watches TV programme televised live.But due to transmission of the direct broadcast television signals based on udp protocol not
Reliably, in network quality difference, it may appear that the situation of data-bag lost, data-bag lost can cause image section to lack or lack
Picture frame is lost, in this state, card screen or mosaic will occur in the live picture that user is watched by set top box.
Utility model content
The utility model provides a kind of video multicast packet loss retransmission system, and it is easy to solve current udp protocol transmission packet loss
Live picture is caused the problem of card screen or mosaic occur.
A kind of video multicast packet loss retransmission system described in the utility model, including：
Signal bit stream source, live telecast signal bit stream is sent to transmission network and packet loss retransmission server；
Transmission network, receive the signal bit stream that signal bit stream source is sent and transmit to set top box, the packet loss that set top box is sent
Repeat requests are to packet loss retransmission server, re-transmission packet that packet loss retransmission server is sent to set top box；
Set top box, signal bit stream is received, judge whether packet loss, confirm packet loss sequence number, send packet loss repeat requests
To packet loss retransmission server；
Packet loss retransmission server, the signal bit stream source received is buffered, receive packet loss repeat requests, send lost data packets
To set top box.
A kind of video multicast packet loss retransmission system described in the utility model, by increasing the realization pair of packet loss retransmission server
The supplement transmission of lost data packets, data when ensureing to play are complete, avoid the appearance of mosaic and video cardton.Code stream is believed
Number source sends signal bit stream to set top box by transmission network, but because current transmission network is multilevel transport network, this
Planting multilevel transport network structures shape code stream information will repeatedly be forwarded in it, be easily lost packet.Due to current
Transmission of video generally by a picture frame be divided into various pieces transmission, if comprising certain a part of data-bag lost, can
Image information is caused not reduce, picture has excalation, i.e., mosaic be present when user watches.Also, during transmission of video
The distinctive information of present frame and previous frame is usually only transmitted, if the existing LOF of crucial figure, the figure of continuous multiple frames can be caused
As information can not be reduced, i.e., video cardton can be found when user watches, and lose multiple packets simultaneously and also result in this kind
Situation.So often there is image when entering multistage network transmission to set top box because of data-bag lost in code stream information source
Mosaic or video cardton, if on the other hand, the packet of loss can be re-transmitted into set top box, before video plays out
So that code stream supplement completely can then solve this problem.But because signal bit stream source can not be recalled after code stream is sent again, i.e.,
Code stream through sending no longer preserves, so even determining the packet lost, because this segment encode stream has been sent from, signal bit stream source
Also this packet can not be retransmitted, can not solve the problems, such as packet loss.On the other hand, the utility model is in this kind of video multicast packet loss retransmission system
In set up packet loss retransmission server, the code stream that sends of packet loss retransmission server buffering code stream signal source, the number that set top box is lost
As long as can retransmitted in packet loss retransmission server internal memory according to bag, with the code stream in this completion set top box, video is avoided to broadcast
Put and go wrong, solving existing Video Multicast System can not be transmitted again to the packet of loss, cause video playback
Mosaic and interim card be present, the problem of influenceing Consumer's Experience.
Brief description of the drawings
Fig. 1 is existing Video Multicast System schematic diagram.
Fig. 2 is video multicast packet loss retransmission system schematic diagram described in the utility model.
Fig. 3 is the operation principle schematic diagram of video multicast packet loss retransmission system described in the utility model.
Embodiment
A kind of video multicast packet loss retransmission system as depicted in figs. 1 and 2, including：Signal bit stream source, send live telecast
Signal bit stream is to transmission network and packet loss retransmission server；Transmission network, receive the signal bit stream that signal bit stream source is sent and biography
Set top box, the packet loss repeat requests that set top box is sent to packet loss retransmission server are transported to, transmission packet loss retransmission server is sent
Packet is retransmitted to set top box；Set top box, signal bit stream is received, judge whether packet loss, confirm packet loss sequence number, transmission is lost
Bag repeat requests are to packet loss retransmission server；Packet loss retransmission server, the signal bit stream source received is buffered, receive packet loss and retransmit
Request, lost data packets are sent to set top box.Signal bit stream transmits easily packet loss, but current video multicast in multistage network
System is then unable to the reception of completion set top box as shown in figure 1, wherein signal bit stream source can not retransmit to the packet of loss
Code stream, it plays video and mosaic and interim card easily occurs.And video multicast packet loss retransmission system described in the utility model, such as scheme
Shown in 2, due to adding packet loss retransmission server, the code stream in its buffering a period of time of the service, set top box receives code stream letter
It is analyzed after number, because each packet in Real-time Transport Protocol has a sequence number increased continuously, this sequence
Row number will not repeat within a period of time, and when packet loss occur in the RTP multicasts that set top box finds to receive, (sequence number loses one
Section, discontinuous), set top box sends to packet loss retransmission server ask accordingly, obtains the RTP bags of assigned serial number, works as packet loss
When retransmission server finds that the bag is present in buffering, just that RTP bag is returned to user.So, even if set top box side receives
There is packet loss in multicast, also has an opportunity to fetch from buffer device there, completion signal bit stream can avoid broadcasting video from easily occurring
The problem of mosaic and interim card.
Set top box in this kind of video multicast packet loss retransmission system is provided with retransmission buffer, and buffering set top box receives
UDP multicasts, after reaching buffer time maximum, code stream is forwarded into player.The buffering area is to buffer the code stream received
Signal is UDP multicasts, if without buffering, then even if the data of loss can be regained from packet loss retransmission server
Bag, but the packet received is forwarded by set top box, and the packet that player is received is still imperfect, and broadcasting still can
There is the problem of mosaic and interim card.However, the packet loss retransmission buffer, the signal bit stream that will be received are set in set top box
The buffering of certain time is carried out, then the packet that can regain loss is set aside some time, as long as being buffered at this up to maximum
Before, receive the packet lost, completion signal bit stream again, you can ensure that the packet for being forwarded to player is complete, solve to broadcast
Put video and mosaic and interim card problem occur.
Live event is should be because set top box plays, so the buffer time of the set top box retransmission buffer should not be set
It is long, avoid the broadcasting of player from larger delay being present.But the buffer time be not easy to set again it is too short, if the buffer time is small
The time that returns again to packet loss retransmission server is transmitted to packet loss retransmission server in signal from set top box, then even if in packet loss weight
The packet that loss is found in server is passed, the packet also can not transport to machine top by signal bit stream by set top box forwarding forward pass again
Box, because buffer time is too short, signal can not complete transmission within this time.So the buffer time is most short should to be arranged to several
According in set top box to packet loss retransmission server transmission time, time index described herein include according to the interactive correspondence time
The time of set top box is transmitted to packet loss retransmission server and returned from packet loss retransmission server to data from set top box.It is but multistage
The jitter of network transmission, follow-up play is had an impact in order to avoid occurring packet loss again in packet loss re-transmission composition,
The set top box also sets up retry mechanism, i.e., within the time for being expected to receive packet（Data are retransmitted in set top box to packet loss and taken
Transmission time in business device）Packet is not received, that is, is defaulted as packet loss, and set top box resends packet loss repeat requests.Acquiescence is set
Number of retransmissions is put as 3 times, then the buffer time of the retransmission buffer is 200ms.
Packet loss retransmission server in this kind of video multicast packet loss retransmission system needs to enter row buffering to signal bit stream, and this is slow
Rush for a period of time, that is, to receive live telecast signal bit stream, and preserve bit stream data for a period of time, maximum is preserved when reaching
During the time, bit stream data will be dropped.This packet loss retransmission server and the signal bit stream without buffering whole, because set top box is simultaneously
It is not to be carried out simultaneously in relay, set top box reception and forwarding after receiving the whole signal bit streams of storage, so after set top box forwarding
Code stream then not necessarily in packet loss retransmission server buffer.Accordingly, the buffer time of packet loss retransmission server continues to be more than
The buffer time of set top box retransmission buffer can ensure the packet that packet loss repeat requests can lose in the server, with this
Meanwhile in order to ensure the real-time of set top box forwarding broadcasting, avoid excessive, the buffer time in the packet loss retransmission server that is delayed
Can in the range of 50 to 500ms value, optimal value 500ms.
This kind of video multicast packet loss retransmission system, because the signal bit stream that signal bit stream source is sent is to be directed to whole set top boxes
Communication, whole set top boxes are intended to carry out reception forwarding to the signal bit stream, then by wide between the signal bit stream source and set top box
Broadcast communication.But packet loss retransmits the communication for some set top box, and packet loss can all occur in not all set top box, also and not all
Set top box all lose uniform data bag, so, the packet loss of a certain set top box only needs refitting to give this set top box, so packet loss retransmits
Communicated between server and set top box by unicast.
Claims (6)
- A kind of 1. video multicast packet loss retransmission system, it is characterised in that including：Signal bit stream source, live telecast signal bit stream is sent to transmission network and packet loss retransmission server；Transmission network, receive the signal bit stream that signal bit stream source is sent and transmit to set top box, the packet loss that set top box is sent retransmits Ask to packet loss retransmission server, the re-transmission packet that packet loss retransmission server is sent to set top box；Set top box, signal bit stream is received, judges whether packet loss, confirm packet loss sequence number, send packet loss repeat requests to losing Bag retransmission server；Packet loss retransmission server, the signal bit stream source received is buffered, receive packet loss repeat requests, send lost data packets to machine Top box.
- 2. a kind of video multicast packet loss retransmission system according to claim 1, it is characterised in that the set top box is provided with Retransmission buffer, the UDP multicasts that buffering set top box receives, after reaching buffer time maximum, player is forwarded by code stream.
- 3. a kind of video multicast packet loss retransmission system according to claim 2, it is characterised in that the retransmission buffer Buffer time minimum value is data transmission time in set top box to packet loss retransmission server.
- 4. a kind of video multicast packet loss retransmission system according to claim 2, it is characterised in that the retransmission buffer Buffer time is 200ms.
- A kind of 5. video multicast packet loss retransmission system according to claim 1, it is characterised in that the packet loss retransmission service Device caches 50 to 500ms bit stream data.
- A kind of 6. video multicast packet loss retransmission system according to claim any one of 1-5, it is characterised in that the code stream By broadcast communication between signal source and set top box, communicated between packet loss retransmission server and set top box by unicast.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282277A (en) * | 2018-01-22 | 2018-07-13 | 西安万像电子科技有限公司 | A kind of packet loss repeating method, apparatus and system |
| CN108377427A (en) * | 2018-01-29 | 2018-08-07 | 明博教育科技股份有限公司 | A kind of method for real-time video transmission and system |
| CN110545486A (en) * | 2019-08-05 | 2019-12-06 | 广州珠江数码集团股份有限公司 | Video signal transmission method, device, medium and terminal equipment |
| CN110944216A (en) * | 2019-12-10 | 2020-03-31 | 广州电力工程监理有限公司 | Live video transmission method and system |
| CN111163362A (en) * | 2019-12-30 | 2020-05-15 | 北京佳讯飞鸿电气股份有限公司 | Video receiving method and system capable of self-adapting retransmission waiting time |
| CN111262653A (en) * | 2020-01-07 | 2020-06-09 | 安徽文香信息技术有限公司 | Data packet loss resisting method, sending end, receiving end and related server |
| CN112636880A (en) * | 2020-12-31 | 2021-04-09 | 北京中联合超高清协同技术中心有限公司 | Side channel retransmission high-reliability ultra-high-definition video satellite transmission system |
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2017
- 2017-06-14 CN CN201720688499.9U patent/CN206908759U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282277A (en) * | 2018-01-22 | 2018-07-13 | 西安万像电子科技有限公司 | A kind of packet loss repeating method, apparatus and system |
| CN108377427A (en) * | 2018-01-29 | 2018-08-07 | 明博教育科技股份有限公司 | A kind of method for real-time video transmission and system |
| CN108377427B (en) * | 2018-01-29 | 2021-11-26 | 明博教育科技股份有限公司 | Real-time video transmission method and system |
| CN110545486A (en) * | 2019-08-05 | 2019-12-06 | 广州珠江数码集团股份有限公司 | Video signal transmission method, device, medium and terminal equipment |
| CN110545486B (en) * | 2019-08-05 | 2022-04-05 | 广州珠江数码集团股份有限公司 | Video signal transmission method, device, medium and terminal equipment |
| CN110944216A (en) * | 2019-12-10 | 2020-03-31 | 广州电力工程监理有限公司 | Live video transmission method and system |
| CN111163362A (en) * | 2019-12-30 | 2020-05-15 | 北京佳讯飞鸿电气股份有限公司 | Video receiving method and system capable of self-adapting retransmission waiting time |
| CN111163362B (en) * | 2019-12-30 | 2021-12-24 | 北京佳讯飞鸿电气股份有限公司 | Video receiving method and system capable of self-adapting retransmission waiting time |
| CN111262653A (en) * | 2020-01-07 | 2020-06-09 | 安徽文香信息技术有限公司 | Data packet loss resisting method, sending end, receiving end and related server |
| CN112636880A (en) * | 2020-12-31 | 2021-04-09 | 北京中联合超高清协同技术中心有限公司 | Side channel retransmission high-reliability ultra-high-definition video satellite transmission system |
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