CN104320676A - A method for correcting abnormal jitter of program clock reference in video transmission stream - Google Patents
A method for correcting abnormal jitter of program clock reference in video transmission stream Download PDFInfo
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- CN104320676A CN104320676A CN201410308603.8A CN201410308603A CN104320676A CN 104320676 A CN104320676 A CN 104320676A CN 201410308603 A CN201410308603 A CN 201410308603A CN 104320676 A CN104320676 A CN 104320676A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/23602—Multiplexing isochronously with the video sync, e.g. according to bit-parallel or bit-serial interface formats, as SDI
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/4425—Monitoring of client processing errors or hardware failure
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The present invention discloses a method for correcting abnormal jitter of program clock reference in a video transmission stream. Through adoption of a PCR distribution rule statistically analyzed before occurrence of a PCR jitter in the transmission stream, a recent clock is reestablished using a newest historical law when the jitter occurs, and an error between the corrected PCR and the actual PCR value is controlled within a range of +/- 500 ns, which effectively eliminates abnormal states, such as decoding, repackaging, generated during the process of recording and processing the audio and video caused by the PCR jitter. The present solution is suitable for a digital audio and video processing and playing field.
Description
Technical field
The invention belongs to Computer Design and applied technical field, relate to computer software, multimedia technology and video and audio treatment technology, particularly a kind of method of the abnormal runout correction of program clock reference in digital video broadcasting transport stream.
Background technology
Program clock reference is called for short the English full name of PCR(: program clock reference), be in RTTS, in order to ensure the normal work of sending and receiving end, frequency and the phase place of receiving terminal and transmitting terminal are consistent, set up the synchronised clock of sending and receiving end.PCR is made up of 33bit base value (Base) and 9bit expanding value (Extension), and PCR value have recorded the temporal information of source in units of the System Clock Reference cycle.Making a start, 27MHz clock is being counted, forming PCR value, then at set intervals PCR value is being injected code stream and send receiving end to; Receiving end has a local clock worked, its rated frequency is equal with clock originator, equally also there is a counter to its counting formation local reference clock. at this moment make a start and PCR can be put forward from transmission class, insert during PES wraps with the coded message of audio frame, frame of video, PCR value in audio frame, frame of video is put in both the buffers by receiving terminal, occur etc. the value in audio frequency and video of making a start to be compared, then with the output control voltage controlled oscillator (VCXO) compared, made the frequency phase lock of sending and receiving end by adjustment, thus realize sending and receiving end sound and image Complete Synchronization.
Under normal circumstances, transport stream is after multiplexing and multiplexing again, and PCR value completely accurately can not reflect the temporal information of message sink coding end, and this phenomenon is called PCR shake (PCR jitter).
In digital video broadcast system, the content of transmission mostly is transport stream (MPEG2-TS) based on MPEG2, the transmission rate that the program clock reference (PCR) for this reason in transmission class flow MPEG2-TS, plays vital effect to reception terminal decoder, the correct execution etc. that heavily encapsulates.
In full court acceptance system trial run process, due to the unsteadiness of some equipment in transmission link, cause the multiple transport stream information sources taken in from satellite or cable digital TV, what all have that program clock reference (PCR) can accidentally meet accident is large apart from random discrete jumping phenomena, if do not carry out correcting or correction accuracy can not meet the demands, decoded image there will be periodic blank screen, mosaic phenomenon, time serious, the direct collapse of decoder, stream wrapper etc., causes whole acceptance system extremely unstable.
State Intellectual Property Office of the People's Republic of China disclosed on 09 29th, 2010 the patent documentation that application publication number is CN101848396A, title is transport stream audio-visual synchronization and anti-shaking method, and concrete steps are: the first time program clock reference of acquisition is set to fiducial time; Judge whether network is shaken; In this way, fiducial time is upgraded; Otherwise, carry out next step; Represent timestamp calculate audio frequency stamp effective time or video stamp effective time according to representing fiducial time and audio frequency timestamp or video.What this scheme solved is the problem that program clock reference is shaken among a small circle, and for beating apart from random greatly, then cannot deal carefully with.
Summary of the invention
The present invention mainly solves and can not process the large technical problem apart from random discrete jumping phenomena of program clock reference existing for prior art, thering is provided a kind of to correcting apart from random discrete beating greatly, enabling the method for the abnormal runout correction of program clock reference in the video transmission stream of decoded image normal play.
The present invention is directed to that above-mentioned technical problem mainly solved by following technical proposals: a kind of method of the abnormal runout correction of program clock reference in video transmission stream, if Local clock is referenced as f (t), the program clock reference in transport stream is F (t); Local clock reference and program clock reference are at difference α (t)=f (the t)-F (t) putting t at the same time, and the maximum difference in preset time cycle T is α
max, minimal difference is α
min; Difference between the program clock reference of two continuous print time point t and t+1 is β (t+1, t)=F (t+1)-F (t), and the maximum difference in preset time cycle T is β
max, minimal difference is β
min; The data volume transmitted between two time points of program clock reference is B (t+1, t), the code check that can obtain between two time points is ζ (t+1, t)=B (t+1, t)/(F (t+1)-F (t)), the maximal rate in preset time cycle T is ζ
max, minimum code rate is ζ
min; When the absolute value of the difference between two adjacent time point F (m) and F (m+1) is greater than threshold value, think and abnormal beating occurs, if when beating, Local clock is f (m), α
end=f (m)-F (m), β
end=F (m)-F (m-1), ζ
end=B (m, m-1)/β
end, now following methods correction is adopted to F (m+1):
Fc1(m+1)=f(m+1)+ (α
min+α
max+4×α
end)/6；
Fc2(m+1)=F(m)+( β
min+β
max+4×β
end)/6；
Fc3(m+1)=F(m)+B(m+1,m)/(ζ
min+ζ
max+4×ζ
end)/6；
Fc(m+1)= (Fc1(m+1)+ 2×Fc2(m+1)+ 3×Fc3(m+1))/6；
In formula, Fc3 (m+1), Fc3 (m+1) and Fc3 (m+1) are intermediate variable, and Fc (m+1) is the program clock reference of revised corresponding m+1 time point;
For the program clock reference of m+2 time point and follow-up time point, revise by the following method:
Fc(n)= Fc(n-1)+(F(n)-F(n-1)) n≥m+2。
Think that abnormal threshold value of beating occurs is generally 100000, namely PCR difference in count is greater than 100000,300 frequency divisions of every count 27M clock.
As preferably, for the program clock reference of m+2 time point and follow-up time point, work as appearance
β
min≤ F (s)-Fc (s-1)≤β
max, s>=m+2, and the time interval s-(m+1) between s time point and the m+1 time point starting correction is less than 1 second, then do not revise F (s) and follow-up program clock reference.
As preferably, after situation described in appearance power 2, for the program clock reference of s time point and follow-up time point, when the absolute value of the difference occurring F (k) and F (k-1) is greater than threshold value, k-1>n, and Fc (k-1)-Fc (s-1)+β
min≤ F (k)-F (s-1)≤Fc (k-1)-Fc (s-1)+β
max, and the time interval k-(s-1) between k time point and s-1 time point is less than 1 second, then revise by the following method F (k):
Fc1(k)=f(k)+ (α
min+α
max+4×α
end)/6；
Fc2(k)=F(k-1)+( β
min+β
max+4×β
end)/6；
Fc3(k)=F(k-1)+B(m+1,m)/(ζ
min+ζ
max+4×ζ
end)/6；
Fca(k)= (Fc1(k)+ 2×Fc2(k)+ 3×Fc3(k))/6；
Fcb(k)= Fc(s-1)+(F(k)-F(s-1))；
If Fcb (k) is >Fc(k-1), then Fc (k)=Fcb (k), otherwise Fc (k)=Fca (k);
For the program clock reference that k time point is later, revise by the following method:
Fc(u)= Fc(u-1)+(F(u)-F(u-1)) u≥k+1。
K and k+1 is continuous print time point.
As preferably, described preset time, the span of cycle T was 100 milliseconds to 1000 milliseconds.
PCR after correction and between actual PCR value, control errors is within ± 500ns, decoder is play according to revised PCR, can obtain normal image.
The substantial effect that the present invention brings is, utilize PCR in transport stream beat occur before statistical separate out the PCR regularity of distribution, when beating generation, recent clock is rebuild by up-to-date historical law, solve PCR occurrent large apart from random discrete tripping problems, avoid the phenomenon that periodic blank screen, mosaic or even decoder, the collapse of stream wrapper appear in decoded image, whole acceptance system is stablized.
Accompanying drawing explanation
Fig. 1 is that a kind of away minor segment of the present invention departs from schematic diagram of beating;
Fig. 2 is that a kind of forward direction of the present invention is quivered schematic diagram;
Fig. 3 is the backward schematic diagram of quivering of one of the present invention;
Fig. 4 is a kind of minizone of the present invention repeat run-out schematic diagram.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: PCR related law in Local clock and transport stream, if Local clock is f (t), in transport stream, clock is F (t), difference α (t)=f (t)-F (t) that two clocks are put at the same time can be obtained, due to the shake of PCR, α value is not same value in the same time, but in one-period T shorter under normal circumstances, α value, by within a comparatively constant scope, is set to α ∈ [α
min, α
max].Before generation of beating, the data in continual analysis cycle T preset time, draw the range boundary that α value is recent: α
min, α
maxand last α
end.
PCR regular interval, in transport stream, clock is F (t), difference β (the t2 between this clock two continuous print time points can be obtained, t1)=F (t2)-F (t1), due to shake and the variable code rate of PCR, β value may not be same value in the same time, but in one-period T shorter under normal circumstances, β value, by within a comparatively constant scope, is set to β ∈ [β
min, β
max].Before generation of beating, the data in continual analysis cycle T preset time, draw the range boundary that β value is recent: β
min, β
maxand a up-to-date β
end.
Code check rule, according to the data volume in transport stream between two clocks and PCR count difference value, if two other code checks of PCR count block are B (t2, t1), can draw the code check between two PCR countings:
ζ(t2,t1)= B(t2,t1) /(F(t2)- F(t1))
Due to shake and the variable code rate of PCR, ζ value may not be same value in the same time, but in one-period T shorter under normal circumstances, and ζ value, by within a comparatively constant scope, is set to ζ ∈ [ζ
min, ζ
max].Before generation of beating, the data in continual analysis cycle T preset time, draw the range boundary that ζ value is recent: ζ
min, ζ
maxand a up-to-date data ζ
end.
PCR many kinds beats the reconstruction process algorithm of type:
1, away minor segment departs from beat (t<1 second)
Refer to consecutive PCR difference F (t2)-F (t1) >100000 in transport stream, but after very little duration (<1 second), recover again to keep original PCR(F (t1)) situation of continuous counter.
If the machine PCR clock is f (t), PCR value actual in transport stream is F (t), and the PCR value of mistake is Fe (t), correct or after revising PCR value be Fc (t), during t1 to t2, receiving data volume is B (t2, t1).
Bounce time point occurs PCR is t10 ... t20, t1 ... t9, t21 ... keep continuity.As Fig. 1.
For this kind of situation, t10 adopts following algorithm correction:
Fc1(t10)=f(t10)+ (α
min+α
max+4*α
end)/6;
Fc2(t10)=F(t9)+( β
min+β
max+4*β
end)/6;
Fc3(t10)=F(t9)+B(t10,t9)/(ζ
min+ζ
max+4*ζ
end)/6;
Fc(t10)= (Fc1(t10)+ 2*Fc2(t10)+ 3*Fc3(t10))/6;
For t11 ~ t20, adopt following algorithm correction:
Fc(tn)= Fc(t(n-1))+(F(tn)-F(t(n-1)));
For t21, adopt following algorithm identified:
F (t21)-Fc (t20) ∈ [β
min, β
max], and t31-t20<1 second
After recognition and verification, this value and successor value are not revised: Fc (t21)=F (t21).
2, forward direction is quivered
Refer to consecutive PCR difference F (t2)-F (t1) >100000 in transport stream, and do not recover to keep original PCR(F (t1) within very little duration (<1 second)) situation of continuous counter.
If the machine PCR clock is f (t), PCR value actual in transport stream is F (t), and the PCR value of mistake is Fe (t), correct or after revising PCR value be Fc (t), during t1 to t2, receiving data volume is B (t2, t1).
Bounce time point occurs PCR is t10 ..., t1 ... t9 keeps continuity.As Fig. 2.
For this kind of situation, t10 adopts following algorithm correction:
Fc1(t10)=f(t10)+ (α
min+α
max+4*α
end)/6;
Fc2(t10)=F(t9)+( β
min+β
max+4*β
end)/6;
Fc3(t10)=F(t9)+B(t10,t9)/(ζ
min+ζ
max+4*ζ
end)/6;
Fc(t10)= (Fc1(t10)+ 2*Fc2(t10)+ 3*Fc3(t10))/6;
For the value after t11, adopt following algorithm correction:
Fc(tn)= Fc(t(n-1))+(F(tn)-F(t(n-1)));
3, backwardly to quiver
Refer to consecutive PCR difference F (t2)-F (t1) <0 in transport stream, and do not recover to keep original PCR(F (t1) within very little duration (<1 second)) situation of continuous counter.
If the machine PCR clock is f (t), PCR value actual in transport stream is F (t), and the PCR value of mistake is Fe (t), correct or after revising PCR value be Fc (t), during t1 to t2, receiving data volume is B (t2, t1).
Bounce time point occurs PCR is t10 ..., t1 ... t9 keeps continuity.As Fig. 3.
Backward quiver judgement and correcting algorithm quiver identical with forward direction.
4, minizone repeat run-out
Refer to consecutive PCR difference F (t2)-F (t1) >100000 in transport stream, but after very little duration (<1 second), recover again to keep original PCR(F (t1)) continuous counter, afterwards after very little duration (<1 second), repeat again a minizone to beat, repeatedly always.
If the machine PCR clock is f (t), PCR value actual in transport stream is F (t), and the PCR value of mistake is Fe (t), correct or after revising PCR value be Fc (t), during t1 to t2, receiving data volume is B (t2, t1).
Bounce time point occurs PCR is t10 ... t20, t1 ... t9, t21 ... t30, t31 ... t40 keeps continuity.As Fig. 4.
For this kind of situation, t10 adopts following algorithm correction:
Fc1(t10)=f(t10)+ (α
min+α
max+4*α
end)/6;
Fc2(t10)=F(t9)+( β
min+β
max+4*β
end)/6;
Fc3(t10)=F(t9)+B(t10,t9)/(ζ
min+ζ
max+4*ζ
end)/6;
Fc(t10)= (Fc1(t10)+ 2*Fc2(t10)+ 3*Fc3(t10))/6;
For t11 ~ t20, adopt following algorithm correction:
Fc(tn)= Fc(t(n-1))+(F(tn)-F(t(n-1)));
For t21..t30, adopt following algorithm identified:
F(t21)-Fc(t20)∈[β
min, β
max]
After recognition and verification, this value comprises not to be revised: Fc (t21)=F (t21).
For t31, adopt following algorithm identified:
F (t31)-F (t20) ∈ [Fc (t30)-Fc (t20)+β
min, Fc (t30)-Fc (t20)+β
max], and t31-t20<1 second
After identification, correction algorithm is as follows:
Fc1(t31)=f(t31)+ (α
min+α
max+4*α
end)/6;
Fc2(t31)=F(t30)+( β
min+β
max+4*β
end)/6;
Fc3(t31)=F(t30)+B(t10,t9)/(ζ
min+ζ
max+4*ζ
end)/6;
Fca(t31)= (Fc1(t31)+ 2*Fc2(t31)+ 3*Fc3(t31))/6;
Fcb(t31)= Fc(t20)+(F(t31)-F(t20));
If Fcb (t31) >Fc(30), then Fc (t31)=Fcb (t31), otherwise Fc (t31)=Fca (t31);
For t32 ... the correction of t40, with t10 ... t20 algorithm is identical.
Effect after reparation:
PCR beats exception, after above-mentioned correcting algorithm, can by control errors between the PCR after revising and actual PCR value within ± 500ns, and effectively eliminate PCR and to beat the exception causing decoding, heavily produce in the audio frequency and video recording processing procedure such as encapsulation.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ the term such as PCR, Local clock herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (4)
1. the method for the abnormal runout correction of program clock reference in video transmission stream, it is characterized in that, if Local clock is referenced as f (t), the program clock reference in transport stream is F (t); Local clock reference and program clock reference are at difference α (t)=f (the t)-F (t) putting t at the same time, and the maximum difference in preset time cycle T is α
max, minimal difference is α
min; Difference between the program clock reference of two continuous print time point t and t+1 is β (t+1, t)=F (t+1)-F (t), and the maximum difference in preset time cycle T is β
max, minimal difference is β
min; The data volume transmitted between two time points of program clock reference is B (t+1, t), the code check that can obtain between two time points is ζ (t+1, t)=B (t+1, t)/(F (t+1)-F (t)), the maximal rate in preset time cycle T is ζ
max, minimum code rate is ζ
min; When the absolute value of the difference between two adjacent time point F (m) and F (m+1) is greater than threshold value, think and abnormal beating occurs, if when beating, Local clock is f (m), α
end=f (m)-F (m), β
end=F (m)-F (m-1), ζ
end=B (m, m-1)/β
end, now following methods correction is adopted to F (m+1):
Fc1(m+1)=f(m+1)+ (α
min+α
max+4×α
end)/6；
Fc2(m+1)=F(m)+( β
min+β
max+4×β
end)/6；
Fc3(m+1)=F(m)+B(m+1,m)/(ζ
min+ζ
max+4×ζ
end)/6；
Fc(m+1)= (Fc1(m+1)+ 2×Fc2(m+1)+ 3×Fc3(m+1))/6；
In formula, Fc3 (m+1), Fc3 (m+1) and Fc3 (m+1) are intermediate variable, and Fc (m+1) is the program clock reference of revised corresponding m+1 time point;
For the program clock reference of m+2 time point and follow-up time point, revise by the following method:
Fc(n)= Fc(n-1)+(F(n)-F(n-1)) n≥m+2。
2. the method for the abnormal runout correction of program clock reference in a kind of video transmission stream according to claim 1, is characterized in that, for the program clock reference of m+2 time point and follow-up time point, works as appearance
β
min≤ F (s)-Fc (s-1)≤β
max, s>=m+2, and the time interval s-(m+1) between s time point and the m+1 time point starting correction is less than 1 second, then do not revise F (s) and follow-up program clock reference.
3. the method for the abnormal runout correction of program clock reference in a kind of video transmission stream according to claim 2, it is characterized in that, for the program clock reference of s time point and follow-up time point, when the absolute value of the difference occurring F (k) and F (k-1) is greater than threshold value, k-1>n, and Fc (k-1)-Fc (s-1)+β
min≤ F (k)-F (s-1)≤Fc (k-1)-Fc (s-1)+β
max, and the time interval k-(s-1) between k time point and s-1 time point is less than 1 second, then revise by the following method F (k):
Fc1(k)=f(k)+ (α
min+α
max+4×α
end)/6；
Fc2(k)=F(k-1)+( β
min+β
max+4×β
end)/6；
Fc3(k)=F(k-1)+B(m+1,m)/(ζ
min+ζ
max+4×ζ
end)/6；
Fca(k)= (Fc1(k)+ 2×Fc2(k)+ 3×Fc3(k))/6；
Fcb(k)= Fc(s-1)+(F(k)-F(s-1))；
If Fcb (k) is >Fc(k-1), then Fc (k)=Fcb (k), otherwise Fc (k)=Fca (k);
For the program clock reference that k time point is later, revise by the following method:
Fc(u)= Fc(u-1)+(F(u)-F(u-1)) u≥k+1。
4. in a kind of video transmission stream according to claim 1 or 2 or 3, the method for the abnormal runout correction of program clock reference, is characterized in that, described preset time, the span of cycle T was 100 milliseconds to 1000 milliseconds.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105578210A (en) * | 2015-12-30 | 2016-05-11 | 惠州市伟乐科技股份有限公司 | Method and device for removing PCR (Program Clock Reference) interval abnormity |
| CN106572362A (en) * | 2016-09-30 | 2017-04-19 | 山东浪潮商用系统有限公司 | Video stream outputting method, device and system |
| CN108156500A (en) * | 2017-12-29 | 2018-06-12 | 珠海全志科技股份有限公司 | Multi-medium data time correcting method, computer installation, computer readable storage medium |
| CN114070828A (en) * | 2022-01-17 | 2022-02-18 | 中央广播电视总台 | Program stream fault detection method and device, computer equipment and readable storage medium |
| WO2023108500A1 (en) * | 2021-12-15 | 2023-06-22 | 深圳Tcl新技术有限公司 | Data processing method and system, storage medium, and terminal device |
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| CN108156500B (en) * | 2017-12-29 | 2020-07-31 | 珠海全志科技股份有限公司 | Multimedia data time correction method, computer device and computer readable storage medium |
| WO2023108500A1 (en) * | 2021-12-15 | 2023-06-22 | 深圳Tcl新技术有限公司 | Data processing method and system, storage medium, and terminal device |
| CN114070828A (en) * | 2022-01-17 | 2022-02-18 | 中央广播电视总台 | Program stream fault detection method and device, computer equipment and readable storage medium |
| CN114070828B (en) * | 2022-01-17 | 2022-05-17 | 中央广播电视总台 | Program stream fault detection method and device, computer equipment and readable storage medium |
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