CN102595252A - Method and system for realizing streaming media forward error correction - Google Patents

Method and system for realizing streaming media forward error correction Download PDF

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Publication number
CN102595252A
CN102595252A CN2011100049616A CN201110004961A CN102595252A CN 102595252 A CN102595252 A CN 102595252A CN 2011100049616 A CN2011100049616 A CN 2011100049616A CN 201110004961 A CN201110004961 A CN 201110004961A CN 102595252 A CN102595252 A CN 102595252A
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fec
relevant information
code stream
information
error correction
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CN102595252B (en
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王芳
陈光亮
李竹平
赵宇
刘继年
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0075—Transmission of coding parameters to receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Error Detection And Correction (AREA)

Abstract

The invention relates to a method and a system for realizing streaming media forward error correction. The method comprises: a transmitting end transmits the forward error correction (FEC) relevant information adopting the transmission form that is the same as the transmission form of the media code flow, wherein the FEC relevant information comprises FEC encoding scheme identifiers; a receiving end receives and allocates the FEC relevant information; the receiving end receives the FEC code flow according to cached FEC relevant information and analyzes FEC data; wherein the FEC decoding restoration is performed based on the FEC data when the media code flow packet loss is detected. The method and the system for realizing the streaming media forward error correction are convenient for realizing the media forward error correction.

Description

Streaming Media forward error correction implementation method and system
Technical field
The present invention relates to the stream media technology field, more specifically, relate to a kind of Streaming Media forward error correction implementation method and system.
Background technology
Along with popularizing and Development of Multimedia Technology of broadband networks, the application of stream media technology also more and more widely.Present streaming media service, be mostly with bit stream data by certain rule packing after, through packet-based communication network, carry out the distribution of data.During for example IPTV (IPTV) uses; TS over RTP (the Transport Stream over Real-time Transport Protocol that use more; MPTS is carried on the RTP) or TS over UDP (Transport Stream over User DatagramProtocol; MPTS is carried on the UDP) mode, distribute through IP network.Because the characteristic that IP network is transmitted as possible is with the situation that inevitably has packet loss.For solving this situation, adopted FEC (Forward Error Correction, forward error correction) mode that code stream is protected, in the time of especially live more.Promptly, carry out the FEC coding, obtain the FEC redundant data packets, and distribute through IP network equally the media data packet of transmission.As long as the media data packet and the FEC redundancy packet of sufficient amount received at the terminal like this, just can pass through certain algorithm, recover the media data packet of losing.
In order to ensure can be correct receive and identify out the FEC code stream; And the correct work of carrying out the fec decoder recovery; The terminal must obtain the relevant information of FEC, for example the load mode of FEC code stream, receiving port, FEC encoding scheme, redundancy, group size, FEC packet format etc.Defined the method for transmitting relevant FEC information through SDP in the related specifications of IETF and 3GPP.
But in some cases, the terminal possibly lack this means of obtaining FEC information through out-band methods such as SDP.During for example at present a lot of IPTV used, for direct broadcast band, the terminal can only get access to corresponding to multicast address of channel code stream and port usually.Do not have the RTSP link, do not have SDP, then above-mentioned FEC information, all have no way of obtaining in the terminal.At this moment, can only rule according to a preconcerted arrangement do usually at the terminal.For example the IPTV system of certain office point arranges the code stream for certain channel in advance, and its corresponding FEC code stream uses and the same multicast address of channel code stream, but port numbers adopts the code stream port numbers to add 2 mode.Like this, the terminal just can on the port of agreement, receive corresponding FEC code stream when obtaining code stream.
This mode is very inconvenient.The in a single day definite just change easily of rule, otherwise just need to revise the configuration information at all terminals, the workload ten minutes is huge, and bothers very much.In addition, belong to the terminal of an office point, take other office points after because the rule of agreement maybe be different, this terminal maybe be with using in new office point.In addition, the relevant parameter in the FEC information can not dynamically update, otherwise also can bring problem to the terminal.
Summary of the invention
The technical problem that the present invention will solve provides a kind of Streaming Media forward error correction implementation method and system, so that realize the Streaming Media forward error correction.
For solving above technical problem, the invention provides a kind of Streaming Media forward error correction implementation method, this method comprises:
Transmitting terminal adopts the transmission means identical with the medium code stream to send forward error correction (FEC) relevant information, and said FEC relevant information comprises FEC encoding scheme sign and the format identification (FID) of FEC data encapsulation;
Receiving terminal receives and disposes said FEC relevant information;
Said receiving terminal receives the FEC code stream and parses the FEC data according to the FEC relevant information of buffer memory, when detecting medium code stream packet loss, utilizes said FEC data to carry out the fec decoder reparation.
Further, said FEC relevant information also comprises the size of group size, channel information, FEC code stream identification, FEC arithmetic element, or the corresponding relation of medium code stream and FEC code stream.
Further, transmitting terminal periodically sends said FEC relevant information.
Further, when said FEC relevant information had modification, the FEC relevant information that said transmitting terminal sends was amended FEC relevant information, and said receiving terminal upgrades local information of preserving after receiving said amended FEC relevant information.
Further, said FEC relevant information is sent based on Motion Picture Experts Group's (MPEG) agreement of expansion or the real-time transport protocol (rtp) of expansion.
Further, transmitting terminal is with the transmission of packing respectively of said medium code stream and FEC code stream.
For solving above technical problem, the present invention also provides a kind of Streaming Media forward error correction to realize system, and this system comprises transmitting terminal and receiving terminal, wherein:
Said transmitting terminal is used to adopt the transmission means identical with the medium code stream to send forward error correction (FEC) relevant information, and said FEC relevant information comprises FEC encoding scheme sign and the format identification (FID) of FEC data encapsulation;
Said receiving terminal comprises:
Receive configuration module, be used for receiving and disposing said FEC relevant information;
FEC code stream processing module is used for receiving the FEC code stream and parsing the FEC data according to the FEC relevant information of buffer memory, when detecting medium code stream packet loss, utilizes said FEC data to carry out the fec decoder reparation.
Further, said FEC relevant information also comprises the size of group size, channel information, FEC code stream identification, FEC arithmetic element, or the corresponding relation of medium code stream and FEC code stream.
Streaming Media forward error correction implementation method of the present invention and system transmit the relevant information of FEC coding and transmission through in-band method; Like this as long as the medium code stream can be received in the terminal; Just can get access to corresponding FEC information, and can realize dynamically updating of FEC information easily.
Description of drawings
Fig. 1 is the sketch map of Streaming Media forward error correction implementation method of the present invention;
Fig. 2 is the sketch map that in TS stream, transmits FEC relevant information and FEC bag;
Fig. 3 is the code stream sketch map that utilizes RTP channel transfer FEC information;
Fig. 4 is the RTP extension header structure that is used to transmit FEC information;
Fig. 5 is the data structure that is used for transmitting at the RTP bag FEC information parameter;
Fig. 6 is the sketch map that Streaming Media forward error correction of the present invention realizes system.
Embodiment
The basic thought of Streaming Media forward error correction implementation method of the present invention and system; Be to transmit the FEC relevant information through in-band method; As long as the medium code stream can be received in the terminal, just can get access to corresponding FEC information, and can realize dynamically updating of FEC information easily like this.
Hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
As shown in Figure 1, Streaming Media forward error correction implementation method of the present invention, this method comprises:
Step 101: transmitting terminal adopts the transmission means identical with the medium code stream to send forward error correction (FEC) relevant information, and said FEC relevant information comprises FEC encoding scheme sign and the format identification (FID) of FEC data encapsulation;
Wherein FEC encoding scheme label table is understood the FEC error correction code algorithms that is adopted, and the format identification (FID) of FEC data encapsulation has then shown the FEC packing data form that is adopted, the different corresponding different FEC algorithms of FEC encoding scheme sign.The FEC data encapsulation form that different FEC data encapsulation format identification (FID)s is corresponding different.These two parameters are necessary, so as the encapsulation format of terminal recognition FEC data, the FEC encryption algorithm that is adopted etc.;
Except that FEC encoding scheme sign and the format identification (FID) of FEC data encapsulation, preferably, said FEC relevant information also comprises the parameter parameter relevant with the FEC transfer of data that the FEC encoding scheme is relevant.The for example size of group size, channel information, FEC code stream identification, FEC arithmetic element, or the corresponding relation of medium code stream and FEC code stream.Particularly, this meaning of parameters is following:
The group size---for some FEC encoding scheme, the group size possibly fixed, and perhaps the terminal can be resolved to relevant parameters from the FEC packet, so this parameter is an option to some FEC encoding scheme and FEC encapsulation format;
Channel information---for example used transmission channel port numbers, the passage of FEC code stream is single channel or binary channels etc., and this parameter is an option.When not comprising this parameter in the FEC information, it is single-channel mode that the terminal need be given tacit consent to, i.e. the FEC code stream transmission channel of medium code streams that has been multiplexing;
The sign of corresponding FEC stream---if lacked this parameter, the terminal can be identified FEC stream, but exist when disturbing code stream through getting rid of the code stream that all can be discerned, and may cause erroneous judgement.All the time comprise this parameter in the FEC information so be recommended in, so that FEC stream can be clearly identified at the terminal;
The size of FEC arithmetic element (symbol)---for some FEC encoding scheme, this parameter is an option.For example when FEC coding was the packet to TS over RTP, the symbol size that general acquiescence is adopted was exactly 1336 bytes, i.e. the length of 7 TS bags are added the length of RTP head;
The corresponding relation of medium code stream and FEC code stream---be recommended in and comprise this parameter in the FEC information all the time, so that the medium code stream that the clear and definite FEC stream in terminal is protected.When having only one road medium code stream, when perhaps one road FEC stream is protected all medium code streams, also can omit this parameter.
Transmitting terminal encapsulates above-mentioned FEC relevant information according to the media transmission protocol that is adopted, and adopts the transmission means identical with the medium code stream to send then.The FEC relevant information can be carried through in media data packet, increasing relevant field, also can be through the new data packet format of definition, and the mode of the transmission channel of multiplexing then medium code stream is sent with the medium code stream.This programme does not limit this.
For the situation of live code stream, this FEC relevant information can periodically be sent, and can in time get access to relevant information to guarantee the new receiving terminal (like the terminal) that inserts.
When this FEC relevant information has the renewal of modification,, send the information after upgrading then in a manner described then according to new parametric configuration relevant information.
Step 102: receiving terminal receives and disposes said FEC relevant information;
In the time of receiving terminal receiving media code stream, also can receive the FEC relevant information that transmits with medium code streams by using same way as, the analytically dependent FEC information of receiving terminal; And be configured in view of the above; Refer to that specifically the terminal in these information of local record, can be kept in the internal memory, for example the parameter of related object instance in the direct modification program; Also can be to be recorded on the memory device, for example in the file.The concrete configuration mode is by the concrete realization decision of receiving terminal.As long as guaranteeing that receiving terminal is follow-up can be according to the information processing FEC code stream that gets access to here.
When said FEC relevant information had modification, the FEC relevant information that said transmitting terminal sends was amended FEC relevant information, and said receiving terminal upgrades local information of preserving after receiving said amended FEC relevant information.
Step 103: said receiving terminal receives the FEC code stream and parses the FEC data according to the FEC relevant information of buffer memory, when detecting medium code stream packet loss, utilizes the FEC data to carry out the fec decoder reparation, recovers the media data packet of losing.
Said FEC relevant information can be sent based on Motion Picture Experts Group's (MPEG) agreement of expansion or the real-time transport protocol (rtp) of expansion.
Below provide specific embodiment respectively with regard to the expansion of these two kinds of agreements:
Embodiment 1
Present embodiment realizes that in-band method transmits the FEC relevant information on the MPEG-2TS basis.Promptly when code stream directly passes through the MPEG-2TS flow transmission, can relevant FEC information be encapsulated among the PMT of TS stream.The FEC redundant data can be used as one road ES (Elementary Stream, elementary stream) stream, multiplexingly in the TS code stream, transmits.The transmission signal is as shown in Figure 2:
Transmitting terminal is with video PES (Packetized Elementary Stream; The elementary stream of packing), send audio frequency PES, other ES and FEC ES stream, the multiplexing back of FEC relevant information; Behind receiving terminal reception and the demultiplexing; Obtain video, audio frequency, FEC and FEC relevant information,, then utilize FEC relevant information and FEC data to carry out forward error correction if detect packet loss.
MPEG-2TS is expanded as follows:
In PMT, increase the fec_signal_descriptor of a program level, define as follows:
Figure BDA0000043470630000061
Annotate: the uimsbf in the table representes signless integer (Unsigned integer; Most significant bitfirst; Specifically referring to the related definition in the ISO/IEC13818-1 standard), the bslbf in the table representes Bit String (Bit string, left bit first; Specifically referring to the related definition in the ISO/IEC13818-1 standard), as follows.
1, descriptor_tag=127 shows that this descriptor is fec_signal_descriptor.The implication of other each fields is following:
Descriptor_length---show the length of this arq_signal_descriptor, referring to the related definition in the ISO/IEC13818-1 standard;
Encoding_id---show the FEC encoding scheme that is adopted, different values has been represented different FEC error correction code algorithms;
Packaging_id---show the FEC data encapsulation form that is adopted, different values has been represented different FEC packing data forms;
The value of group_count_flag---this field is 1 o'clock, shows that there is the group_count field back, and being zero does not have the group_count field;
The value of symbol_size_flag---this field is 1 o'clock, shows that there is the symbol_size field back, and being zero does not have the symbol_size field;
Reserved---reserved field should be changed to 0 entirely;
Group_count---expression group size, when not having, the terminal need be adaptive voluntarily according to parameters such as FEC encoding schemes;
Symbol_size---the symbol size during expression FEC computing, when not having, the terminal need be adaptive voluntarily according to parameters such as FEC encoding schemes;
2, increase a stream_type type, be used to identify FEC stream, when for example the stream_type value is 0xFF, represent that corresponding pid stream is a FEC stream;
3, in PMT, increase other fec_label_descriptor of ES level, be used for adding a FEC label to ES stream.The Media Stream that label value is identical flows corresponding to same FEC.Like this can the identification medium code stream and the corresponding relation of FEC code stream.Define as follows:
Wherein descriptor_tag=128 shows that this descriptor is fec_label_descriptor.The implication of other each fields is following:
Label---label value, the non-FEC with same label value flows, and is had the FEC stream protection of same label value.
For the stream media system of supporting above-mentioned MPEG-2TS expansion, the handling process of its transmitting terminal and receiving terminal is following:
Transmitting terminal:
(1), in PMT, increases FEC and be correlated with/information according to above-mentioned expansion to MPEG-2TS; Press the FEC encoding scheme of appointment in the FEC relevant information, accomplish the generation of FEC data, and be packaged into the FEC stream of corresponding format, be multiplexed in the TS stream;
(2) the TS code stream of FEC relevant information and data has been added in transmission;
The relevant regulations that PMT sends is for example sent frequency, renewal etc., can follow the relevant regulations of MPEG-2 TS.Because FEC information can be sent along with PMT cycle together, can in time obtain FEC information thereby can guarantee newly to access terminal.Equally also can guarantee the renewal when FEC information changes;
Receiving terminal
(1) receives the TS code stream, resolve PMT wherein, therefrom obtain the relevant information of medium code stream and the relevant information of FEC;
(2) according to the information that obtains among the PMT, TS stream is carried out demultiplexing, obtain wherein medium code stream and FEC stream;
(3) when detecting medium code stream generation packet loss, then utilize paid-in medium bag and FEC bag, carry out FEC and repair.
Can not discern the terminal of relevant FEC information and FEC stream, can abandon corresponding FEC stream according to PID.
Embodiment 2
Present embodiment transmits the relevant signaling of FEC through RTP/RTCP, realizes interior transmission of band of FEC relevant information.
When code stream transmits through rtp streaming (for example TS over RTP), can relevant FEC information be encapsulated in the RTP/RTCP bag, transmit through the RTP/RTCP passage.Fig. 3 has provided the signal that utilizes RTP channel transfer FEC information.The FEC redundant data can be used as one road rtp streaming, and the RTP passage of multiplexing medium code stream perhaps uses new RTP passage to transmit.
RTP is expanded as follows:
1, distribute a special PT (Payload Type, the PT field in the RTP packet header is used for the identification load type) value, for example 125, be used to identify corresponding rtp streaming and be used to transmit FEC information.Be used to transmit the RTP bag of FEC information like this, oneself independently serial number space just can be arranged, avoid normal RTP code stream is caused interference;
2, RTP extension header of definition is used to identify the RTP packet format that transmits FEC information and follows which standard.Only the PT value equal 125 o'clock effective.The extension header definition is as shown in Figure 4, follows the related definition of RFC3550.Can set defined by profile field is a particular value, and for example ascii character " FE " to indicate corresponding RTP load, is used to transmit FEC information.The different values of the Identifier field in the extension header show corresponding standard, the RTP packet format definition that different standards maybe be corresponding different.When for example the Identifier value is ascii character " ZFEC ", show that then in the RTP load of followed, the form of entrained FEC information parameter is followed the relevant regulations in the present embodiment;
3, the form of definition FEC information relevant parameter in the RTP bag.Because the partial parameters in the FEC information belongs to option,, can adopt the structure of Type-Length-Value (TLV) to the parameter in the signaling for ease of structure message.Be that basic structure is as shown in Figure 5.At first indicate different parameter types, indicate the length of this parameter value then through the Length field, carry concrete parameter value in the Value field then through the type field.If a plurality of parameters are arranged, then in the RTP load corresponding a plurality of TLV structure.Need the FEC parameter of support as follows:
Figure BDA0000043470630000091
Figure BDA0000043470630000101
For the stream media system of supporting above-mentioned RTP expansion, the handling process of its transmitting terminal and receiving terminal is following:
Transmitting terminal
(1), the FEC relevant information is encapsulated in the RTP bag according to above-mentioned expansion to RTP;
(2) the RTP passage of use medium bag sends the RTP bag that has carried the FEC relevant information;
This RTP bag that has carried the FEC relevant information can send in the cycle, and when the FEC relevant information changed, then according to the FEC relevant information after changing, the message bag of structure RTP form sent by above-mentioned rule then.
Receiving terminal
(1) receive the RTP bag, demultiplexing goes out wherein to carry the RTP bag of FEC relevant information;
(2), receive the FEC packet according to the FEC relevant information of being obtained;
(3) when detecting medium rtp streaming generation packet loss, utilize FEC relevant information and FEC bag, the medium bag is carried out FEC repair.
Corresponding to above method, the present invention also provides a kind of Streaming Media forward error correction to realize system, and as shown in Figure 6, this system comprises transmitting terminal and receiving terminal, wherein,
Transmitting terminal is used to adopt the transmission means identical with the medium code stream to send forward error correction (FEC) relevant information, and said FEC relevant information comprises FEC encoding scheme sign and the format identification (FID) of FEC data encapsulation;
Further, said FEC relevant information also comprises the size of group size, channel information, FEC code stream identification, FEC arithmetic element, or the corresponding relation of medium code stream and FEC code stream.
Receiving terminal comprises:
Receive configuration module, be used for receiving and disposing said FEC relevant information;
FEC code stream processing module is used for receiving the FEC code stream and parsing the FEC data according to the FEC relevant information of buffer memory, when detecting medium code stream packet loss, utilizes said FEC data to carry out the fec decoder reparation.
Further, said transmitting terminal periodically sends said FEC relevant information.
Further, when said FEC relevant information had modification, the FEC relevant information that said transmitting terminal sends was amended FEC relevant information, and the reception configuration module of said receiving terminal upgrades local information of preserving after receiving said amended FEC relevant information.
Further, said FEC relevant information is sent based on Motion Picture Experts Group's (MPEG) agreement of expansion or the real-time transport protocol (rtp) of expansion.
Intelligible, mentioned functional module is the related content that the present invention is different from prior art in the above system, and in the present technique scheme, transmitting terminal and receiving terminal are not got rid of to be had new or the prior function module.
Adopt technical scheme of the present invention, can make the user in the receiving media code stream, get access to relevant FEC relevant information easily, thereby successfully realize the reception and the reparation of FEC code stream.Simultaneously, when the FEC relevant information is changed to some extent, also can notify the user in time, make corresponding adjustment.
Among the present invention, medium code stream and FEC code stream can be packed respectively, and transmission respectively also can combine the packing transmission with FEC data and medium code stream.Transmit the relevant information of FEC coding and transmission through in-band method, as long as the medium code stream can be received in the terminal, just can get access to corresponding FEC information, and can realize dynamically updating of FEC information easily like this.When medium code stream and FEC code stream were packed transmission respectively, the terminal can need determine whether reception FEC code stream according to oneself resource situation.When needing, just can receive the FEC code stream, and therefrom parse the FEC data, according to the FEC coding relevant information of being obtained, do the fec decoder computing then, repair code stream according to the FEC data encapsulation information of being obtained according to the FEC related transmitting information of being obtained.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each module in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

Claims (11)

1. Streaming Media forward error correction implementation method is characterized in that this method comprises:
Transmitting terminal adopts the transmission means identical with the medium code stream to send forward error correction (FEC) relevant information, and said FEC relevant information comprises FEC encoding scheme sign and the format identification (FID) of FEC data encapsulation;
Receiving terminal receives and disposes said FEC relevant information;
Said receiving terminal receives the FEC code stream and parses the FEC data according to the FEC relevant information of buffer memory, when detecting medium code stream packet loss, utilizes said FEC data to carry out the fec decoder reparation.
2. the method for claim 1 is characterized in that: said FEC relevant information also comprises the size of group size, channel information, FEC code stream identification, FEC arithmetic element, or the corresponding relation of medium code stream and FEC code stream.
3. the method for claim 1, it is characterized in that: transmitting terminal periodically sends said FEC relevant information.
4. the method for claim 1; It is characterized in that: when said FEC relevant information has modification; The FEC relevant information that said transmitting terminal sends is amended FEC relevant information, and said receiving terminal upgrades local information of preserving after receiving said amended FEC relevant information.
5. the method for claim 1 is characterized in that: said FEC relevant information is sent based on Motion Picture Experts Group's (MPEG) agreement of expansion or the real-time transport protocol (rtp) of expansion.
6. the method for claim 1 is characterized in that: said transmitting terminal is with the transmission of packing respectively of said medium code stream and FEC code stream.
7. a Streaming Media forward error correction realizes system, it is characterized in that this system comprises transmitting terminal and receiving terminal, wherein:
Said transmitting terminal is used to adopt the transmission means identical with the medium code stream to send forward error correction (FEC) relevant information, and said FEC relevant information comprises FEC encoding scheme sign and the format identification (FID) of FEC data encapsulation;
Said receiving terminal comprises:
Receive configuration module, be used for receiving and disposing said FEC relevant information;
FEC code stream processing module is used for receiving the FEC code stream and parsing the FEC data according to the FEC relevant information of buffer memory, when detecting medium code stream packet loss, utilizes said FEC data to carry out the fec decoder reparation.
8. system as claimed in claim 7 is characterized in that: said FEC relevant information also comprises the size of group size, channel information, FEC code stream identification, FEC arithmetic element, or the corresponding relation of medium code stream and FEC code stream.
9. system as claimed in claim 7 is characterized in that: transmitting terminal periodically sends said FEC relevant information.
10. system as claimed in claim 7; It is characterized in that: when said FEC relevant information has modification; The FEC relevant information that said transmitting terminal sends is amended FEC relevant information, and the reception configuration module of said receiving terminal upgrades local information of preserving after receiving said amended FEC relevant information.
11. system as claimed in claim 7 is characterized in that: said FEC relevant information is sent based on Motion Picture Experts Group's (MPEG) agreement of expansion or the real-time transport protocol (rtp) of expansion.
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