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GY/T 325-2019: Technical requirements and measurement methods for AV-IT system in TV stations file-based producing and broadcasting networks
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Technical requirements and measurement methods for AV-IT system in TV stations file-based producing and broadcasting networks
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Basic data | Standard ID | GY/T 325-2019 (GY/T325-2019) | | Description (Translated English) | Technical requirements and measurement methods for AV-IT system in TV stations file-based producing and broadcasting networks | | Sector / Industry | Radio, Film & TV Industry Standard (Recommended) | | Classification of Chinese Standard | M61 | | Word Count Estimation | 37,374 | | Date of Issue | 2019-10-11 | | Date of Implementation | 2019-10-11 | | Regulation (derived from) | Broadcasting TV Bullitin (2019) No.86 | | Issuing agency(ies) | State Administration of Radio and Television | GY/T 325-2019: Technical requirements and measurement methods for AV-IT system in TV stations file-based producing and broadcasting networks
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(Technical requirements and measurement methods of AV station's documented production and broadcasting network AV-IT system)
GY
Radio and Television Industry Standards of the People's Republic of China
AV-IT system for TV station file production network
Technical requirements and measurement methods
Technical requirements and measurement methods for AV-IT system in TV station's
file-based producing and broadcasting networks
2019-10-11 release
2019-10-11 implementation
Published by the State Administration of Radio and Television
Contents
Foreword ... III
1 Scope ... 1
2 Normative references ... 1
3 Terms, definitions and abbreviations ... 1
3.1 Terms and definitions ... 1
3.2 Acronyms ... 1
4 Program information exchange scenarios ... 2
4.1 Overview ... 2
4.2 Signal/File ... 3
4.3 File/Signal ... 4
4.4 File Streaming ... 5
4.5 Stream files ... 6
4.6 File/File ... 7
4.7 Flow signal ... 8
4.8 Signal Flow ... 9
4.9 Streams ... 10
5 Technical requirements ... 10
5.1 Input interface characteristics and data format ... 10
5.2 Output interface characteristics and data format ... 11
5.3 Encoding format ... 11
5.4 Package Format ... 11
5.5 Format conversion processing efficiency ... 12
5.6 File import processing efficiency ... 12
5.7 File Export Processing Efficiency ... 12
5.8 Composition/Packaging Processing Efficiency ... 12
5.9 Image Quality Evaluation ... 12
5.10 Video Channel Characteristics ... 12
5.11 Audio Channel Characteristics ... 13
5.12 Relative delay of audio and video ... 13
5.13 Channel Configuration ... 13
6 Measurement method ... 13
6.1 Input interface characteristics and data format ... 13
6.2 Output interface characteristics and data format ... 15
6.3 Encoding format ... 17
6.4 Package Format ... 18
6.5 Format conversion processing efficiency ... 19
6.6 File import processing efficiency ... 19
6.7 File Export Processing Efficiency ... 19
6.8 Composition/Packaging Processing Efficiency ... 20
6.9 Image Quality Evaluation ... 20
6.10 Video Channel Characteristics ... 21
6.11 Audio Channel Characteristics ... 21
6.12 Relative delay of audio and video ... 22
6.13 Channel Configuration ... 22
Appendix A (Normative Appendix) Format Conversion Processing Efficiency Test Materials ... 24
Appendix B (Normative Appendix) Composition/Packaging Processing Efficiency Test Materials ... 25
Appendix C (Normative Appendix) Image Quality Evaluation Materials ... 26
Appendix D (Normative Appendix) Video Channel Characteristics Test Materials ... 27
Appendix E (Normative Appendix) Audio Channel Characteristics Test Materials ... 28
Appendix F (Normative Appendix) Audio and Video Relative Delay Test Materials ... 29
Appendix G (Normative Appendix) Channel Configuration Check Material ... 30
References ... 31
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some elements of this document may involve patents. The issuer of this document is not responsible for identifying these patents.
This standard is under the jurisdiction of the National Radio, Film and Television Standardization Technical Committee (SAC/TC 239).
This standard was drafted. China Central Radio and Television (CCTV), State Administration of Radio and Television Broadcasting and Television Planning Institute.
The main drafters of this standard. Ding Wenhua, Song Yichun, Li Yan, Zhao Yu, Wei Anming, Deng Xiangdong, Tong Tao, Dong Wenhui, Ning Jinhui, Xiao
Hui, Zhen Zhanjing, Pan Bo, Cui Junsheng, Wang Huiming, Zhang Qian, Zhang Jiandong, Qin Yili, Zheng Guanwen, Wang Rui, Bin Xiaogong, Zhang Wujin, Suo Yue
Fei, Wang Qiannan.
Technical requirements and measurement methods of AV station's documented production and broadcasting network AV-IT system
1 Scope
This standard specifies the technical requirements and measurement methods for AV station's documented production and broadcasting network AV-IT system.
This standard applies to the R & D, production, acceptance, operation and maintenance of software and equipment in AV-IT systems.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 31001-2014 Test image for subjective evaluation of high definition television
GY/T 134-1998 Digital TV image quality subjective evaluation method
GY/T 157-2000 studio high-definition television digital video signal interface
GY/T 158-2000 studio digital audio signal interface
GY/T 170-2001 Cable Digital TV Broadcasting Channel Coding and Modulation Specification
ETSI TS 102 034 V1.5.1 transmits DVB services based on MPEG-2 TS (Transport of MPEG-2 TS Based) over IP networks
DVB Services over IP Based Networks)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1
Processing efficiency
The ratio of the length of the material to the time it takes to complete the AV-IT processing of the material, the unit is double speed.
3.2 Acronyms
The following abbreviations apply to this document.
AES/EBU Audio Engineering Society/European Broadcasting Union
Union)
ASI Asynchronous Serial Interface
AVI Audio Video Interleaved
DSCQS Double Stimulus Continuous Quality Scale
HD-SDI High Definition-Serial Digital Interface
MOV Movie Digital Video
MPEG Moving Picture Experts Group
MXF Material eXchange Format
PCM Pulse Code Modulation
PSNR Peak Signal to Noise Ratio
TS Transport Stream
UDP User Datagram Protocol
4 Program information exchange scenarios
4.1 Overview
In the production and broadcasting network system, video and audio programs appear in two forms. real-time and non-real-time. The main form of real-time morphology is real-time baseband
Signal or real-time stream, the main manifestation of non-real-time form is static storage file or formatted static storage data.
In the production and broadcasting network system, different program forms or different forms of the same program form can be converted to each other. To achieve this conversion
The technical system of the process is called the AV-IT system, which is generally responsible for performing transcoding and decoding of compressed video and audio, encoding of baseband video and audio, and media
Format data encapsulation, decapsulation and up-down conversion, synthesis/packaging, etc.
The schematic diagram of the AV-IT system that realizes the mutual conversion between program information forms or forms is shown in Figure 1.
Encapsulation/Decapsulation
Encapsulation
Conversion
interface
Transcoding codec
up and down
Transform
IT system
AV-IT system
up and down
Transform
Signal/Stream Processing Domain
File processing domain
AV system
Figure 1 Schematic of the AV-IT system that realizes the conversion of two kinds of program information
Program information processing in the form of real-time baseband signals can be completed in the signal processing domain, and program information processing in the form of real-time code streams can be performed at the stream.
It can be completed in the physical domain. Program information processing in the form of files can be completed in the file processing domain. At the same time, program information can be transferred to each other in three domains.
change. The conversion process of the program information in the signal/compressed code stream/file domain is shown in Figure 2.
File signal
Figure 2 Program information conversion between signal/compressed code stream/file domain
When the program information is converted between the three domains, in addition to the streaming, signal, and signal scenes, this standard specifies the information through the AV-IT system.
7 types of program information exchange. file, file, signal, file, stream, file, file, stream, signal
Scenario measurement items and their technical requirements and measurement methods.
Note. "" is a program information form or program information form conversion symbol, which means that the program information is converted from the form or form on the left side of the conversion character to the right side of the conversion character.
4.2 Signal files
The program information processing sequence is. signal input, signal interface adaptation, up-down conversion (if included), encoding, packaging, file input
Out, as shown in Figure 3.
File signal
Encapsulation
interface
coding
IT system
AV-IT system
up and down
Transform
Signal processing domain
File processing domain
AV system
Figure 3 Program information from signal to file
The measurement items, technical requirements and measurement methods of this process are shown in Table 1.
Table 1 Technical requirements and measurement methods of signal files
Serial number measurement item technical requirements chapter number
1 Input interface characteristics 5.1 6.1
2 Signal format (input) 5.1 6.1
3 Encoding format (output) 5.3 6.3
4 Package format (output) 5.4 6.4
5 File export processing efficiency 5.7 6.7
6 Image quality evaluation 5.9 6.9
7 Video channel characteristics 5.10 6.10
8 Audio channel characteristics 5.11 6.11
9 relative delay of audio and video 5.12 6.12
10-channel configuration 5.13 6.13
4.3 File/Signal
The program information processing sequence is. file input, decapsulation, decoding, up-down conversion (if included), signal interface adaptation, signal
Output, as shown in Figure 4.
File signal
Decapsulation
interface
decoding
IT system
AV-IT system
up and down
Transform
Signal processing domain
File processing domain
AV system
Figure 4 Program information from file to signal
The measurement items, technical requirements and measurement methods of this process are shown in Table 2.
Table 2 Technical requirements and measurement methods
Serial number measurement item technical requirements chapter number
1 Output interface characteristics 5.2 6.2
2 Signal format (output) 5.2 6.2
3 Encoding format (input) 5.3 6.3
4 Package format (input) 5.4 6.4
5 File import processing efficiency 5.6 6.6
6 Video channel characteristics 5.10 6.10
7 Audio channel characteristics 5.11 6.11
8 Audio and video relative delay 5.12 6.12
9-channel configuration 5.13 6.13
4.4 File Streaming
The program information processing sequence is. file input, decapsulation, decoding (if included), up-down conversion (if included), encoding (such as
Including), encapsulation, stream interface adaptation, and compressed code stream output, as shown in Figure 5.
interface
up and down
Transform
IT system
AV-IT system
Stream processing domain
File processing domain
File signal
AV system
Decapsulation
decoding
coding
Encapsulation
Figure 5 Program information from file to stream
The measurement items, technical requirements and measurement methods of this process are shown in Table 3.
Table 3 Technical requirements and measurement methods for document flow
Serial number measurement item technical requirements chapter number
1 Output interface characteristics 5.2 6.2
2 Encoding format (input) 5.3 6.3
3 Encoding format (output) 5.3 6.3
4 Package format (input) 5.4 6.4
5 Package Format (Stream Output) 5.4 6.4
6 File import processing efficiency 5.6 6.6
7 Image quality evaluation 5.9 6.9
8 Video channel characteristics 5.10 6.10
9 Audio channel characteristics 5.11 6.11
10 Relative delay of audio and video 5.12 6.12
11-channel configuration 5.13 6.13
4.5 Stream files
The program information processing sequence is. compressed stream input, stream interface adaptation, decapsulation, decoding (if included), up-down conversion (such as
Including), encoding (if included), packaging, and file output, as shown in Figure 6.
interface
up and down
Transform
IT system
AV-IT system
Stream processing domain
File processing domain
File signal
AV system
Encapsulation
coding
decoding
Decapsulation
Figure 6 Program information from stream to file
The measurement items, technical requirements and measurement methods of this process are shown in Table 4.
Table 4 Technical requirements and measurement methods for streaming documents
Serial number measurement item technical requirements chapter number
1 Input interface characteristics 5.1 6.1
2 Encoding format (input) 5.3 6.3
3 Encoding format (output) 5.3 6.3
4 Encapsulation Format (Stream Input) 5.4 6.4
5 Package format (output) 5.4 6.4
6 File export processing efficiency 5.7 6.7
7 Image quality evaluation 5.9 6.9
8 Video channel characteristics 5.10 6.10
9 Audio channel characteristics 5.11 6.11
10 Relative delay of audio and video 5.12 6.12
11-channel configuration 5.13 6.13
4.6 File/File
The program information processing sequence is. file input, decapsulation, decoding (if included), encoding (if included), packaging, file output
Out, as shown in Figure 7.
interface
IT system
AV-IT system
Signal/Stream Processing Domain
File A File Processing Domain File B
File signal
AV system
Encapsulation
encode decode
Decapsulation
Figure 7 Program information from file to file
The measurement items, technical requirements and measurement methods of this process are shown in Table 5.
Table 5 Technical requirements and measurement methods of documents and documents
Serial number measurement item technical requirements chapter number
1 Encoding format (input) 5.3 6.3
2 Encoding format (output) 5.3 6.3
3 Package format (input) 5.4 6.4
4 Package format (output) 5.4 6.4
5 Format conversion processing efficiency 5.5 6.5
6 File import processing efficiency 5.6 6.6
7 File export processing efficiency 5.7 6.7
8 Synthesis/packet processing efficiency 5.8 6.8
9 Image quality evaluation 5.9 6.9
10 Video Channel Characteristics 5.10 6.10
11 Audio channel characteristics 5.11 6.11
12 Relative delay of audio and video 5.12 6.12
13-channel configuration 5.13 6.13
4.7 Flow signal
The program information processing sequence is. compression code stream input, stream interface adaptation, decapsulation, decoding, up-down conversion (if included), information
No. interface adaptation, signal output, as shown in Figure 8.
File signal
interface
decoding
IT system
AV-IT Department
Up-down
Signal processing domain
AV system
Stream processing domain
Decapsulation
File domain
Figure 8 Program information from stream to signal
The measurement items, technical requirements and measurement methods of this process are shown in Table 6.
Table 6 Technical requirements and measurement methods for streaming signals
Serial number measurement item technical requirements chapter number
1 Input interface characteristics 5.1 6.1
2 Output interface characteristics 5.2 6.2
3 Signal format (output) 5.2 6.2
4 Encoding format (input) 5.3 6.3
5 Encapsulation Format (Stream Input) 5.4 6.4
6 Video channel characteristics 5.10 6.10
7 Audio channel characteristics 5.11 6.11
8 Audio and video relative delay 5.12 6.12
9-channel configuration 5.13 6.13
4.8 Signal Flow
The program information processing sequence is. signal input, signal interface adaptation, up-down conversion (if included), encoding, encapsulation, stream interface
Adaptive, real-time stream output, as shown in Figure 9.
File signal
interface
coding
IT system
AV-IT system
Up-down
Signal processing domain
AV system
Stream processing domain
Encapsulation
File domain
Figure 9 Program information from signal to stream
The measurement items, technical requirements and measurement methods of this process are shown in Table 7.
Table 7 Technical requirements and measurement methods for signal flow
Serial number measurement item technical requirements chapter number
1 Input interface characteristics 5.1 6.1
2 Output interface characteristics 5.2 6.2
3 Signal format (input) 5.2 6.2
4 Encoding format (output) 5.3 6.3
5 Package Format (Stream Output) 5.4 6.4
6 Video channel characteristics 5.10 6.10
7 Audio channel characteristics 5.11 6.11
8 Audio and video relative delay 5.12 6.12
9-channel configuration 5.13 6.13
4.9 Stream
The program information processing sequence is. code stream input, stream interface adaptation, decapsulation, decoding (if included), encoding (if included),
Encapsulation, stream interface adaptation, and real-time stream output, as shown in Figure 10.
file
signal
interface
coding
IT system
AV-IT system
Stream processing domain
AV system
Stream processing domain
Encapsulation
File domain
decoding
Decapsulation
Figure 10 Program information from stream to stream
5 Technical requirements
5.1 Input interface characteristics and data format
The corresponding characteristics and data format requirements of the input interface are shown in Table 8.
Table 8 Input interface characteristics and data format
Serial Interface Type Technical Requirements
1 HD-SDI can receive signals and data according to GY/T 157-2000
2 ASI can receive signals and data according to GY/T 170-2001
3 TS over UDP can receive data in accordance with ETSI TS 102 034 V1.5.1
4 AES/EBU can receive data according to GY/T 158-2000
5.2 Output interface characteristics and data format
The corresponding characteristics and data format requirements of the output interface are shown in Table 9.
Table 9 Output interface characteristics and data format
Serial Interface Type Technical Requirements
1 HD-SDI meets the requirements of GY/T 157-2000
2 ASI meets the requirements of GY/T 170-2001
3 TS over UDP meets the requirements of ETSI TS 102 034 V1.5.1
4 AES/EBU meets the requirements of GY/T 158-2000
5.3 encoding format
The system under test shall be able to support the encoding format of Table 10 in the input link, and shall be able to generate one or more encoding grids in accordance with Table 10 in the output link.
formula.
Table 10 Encoding format
Serial number encoding format
1 AVC-Intra
2 DNxHD
3 ProRes 422
4 MPEG-2
5 Linear PCM
6 H.264 (optional)
7 H.265 (optional)
8 AVS (optional)
5.4 Package Format
The system under test should be able to decapsulate the format of Table 11 in the input link and generate one or more packaging grids in accordance with Table 11 in the output link.
formula.
Table 11 Package format
Serial number package format
1 MXF Op1a
2 MXF Op-Atom
3 AVI
4 TS
5 MOV
6 WAV
5.5 Format Conversion Processing Efficiency
The test materials are shown in Appendix A. The format conversion processing efficiency should be no less than 2.1 times the speed.
5.6 File Import Processing Efficiency
When importing files through the drive, the import efficiency should be no less than 2x.
5.7 File Export Processing Efficiency
When exporting files through the drive, the export efficiency should be no less than 2 times faster.
5.8 Composition/Package Processing Efficiency
The test materials are shown in Appendix B. The synthesis/packing processing efficiency should be no less than 4.2 times the speed.
5.9 Image Quality Evaluation
The image quality evaluation may adopt a subjective evaluation method or a subjective evaluation objectification method, and a subjective evaluation method is preferred.
The image sequence is selected from GB/T 31001-2014, and the number of image sequences is ≥4. The test materials are shown in Appendix C.
Subjective evaluation of image quality, using the DSCQS method specified in GY/T 134-1998, the number of evaluation personnel is ≥15, and the evaluation results should
≥75% of the image sequence relative to the source image sequence quality degradation percentage ≤8%, the rest of the image sequence relative to the image of the source image sequence
The percentage of quality reduction is ≤12%.
When there are more than three image quality evaluations, a subjective evaluation method can be adopted. After calculating the image quality score, you should
The lowest score is verified by subjective evaluation. If it meets the subjective evaluation requirements for image quality, all image quality is considered full
Meet image quality requirements.
When there is no subjective evaluation condition, an objective method of subjective evaluation of image quality can be adopted, and the quality score of the measured image should reach "damage
Injuries are perceptible but not obvious. "The indicators used for different objective evaluations are different. If PSNR is used, the score should not be lower than 34dB.
5.10 Video Channel Characteristics
The video channel characteristics shall meet the requirements of Table 12.
Table 12 Video channel characteristics
Measurement item
Technical index
Y Cb Cr
1 intervention gain ± 0.1 ± 0.1 ± 0.1
2 Amplitude-frequency characteristics
Frequency range 0 ～ 30MHz 0 ～ 15MHz 0 ～ 15MHz
Amplitude tolerance ± 0.2dB ± 0.2dB ± 0.2dB
3 Non-linear distortion ≤1.5% ≤1.5% ≤1.5%
5.11 Audio Channel Characteristics
In addition to the low-frequency enhancement channel, the audio channel characteristics of other channels shall meet the requirements of Table 13.
Table 13 Audio channel characteristics
Technical index of measurement item
1 Total harmonic distortion
2 Amplitude frequency response (20Hz ～ 20kHz) -0.5dB ～ 0.5dB
3 Noise signal output level (unweighted)
≤-93dBFS (16bit);
≤-117dBFS (20bit or 24bit)
4 channel level difference ≤0.5dB
5 channel phase difference
5.12 Relative Delay of Audio and Video
The relative delay of audio and video should be -20ms to 22.5ms. A positive value indicates that the sound is ahead of the image.
5.13 channel configuration
The number and order of the output channels of the system under test should be consistent with the configuration requirements.
6 Measurement method
6.1 Input interface characteristics and data format
6.1.1 HD-SDI measurement
6.1.1.1 Measurement block diagram
The measurement block diagram is shown in Figure 11.
System under test
HD-SDI
Video Tester Playout Server
Test material output signal
Figure 11 HD-SDI input interface characteristics and data format measurement block diagram
6.1.1.2 Measurement procedure
The measurement steps are as follows.
a) Connect the test system according to Figure 11, convert the materials in Appendix D into HD-SDI signals and input them to the system under test;
b) Configure the process parameters, set the output encoding format to MPEG-2, and optionally package it
c) implementation of processing;
d) Use a video tester to test the output signal of the system under test (if the output is a stream or a file, it needs to be collected and played back as an HD-SDI signal)
Video channel characteristics and recording.
6.1.2 ASI
6.1.2.1 Measurement block diagram
The measurement block diagram is shown in Figure 12.
System under test
ASI
Video tester
Broadcast server
Encoder
Test material output signal
Figure 12 ASI input interface characteristics and data format measurement block diagram
6.1.2.2 Measurement procedure
The measurement steps are as follows.
a) Connect the test system according to Figure 12, convert the materials in Appendix D into ASI signals and input them into the system under test
b) Configure the process parameters, set the output encoding format to MPEG-2, and optionally package it
c) implementation of processing;
d) Use a video tester to test the output signal of the system under test (if the output is a stream or a file, it needs to be collected and played back as an HD-SDI signal)
Video channel characteristics and recording.
6.1.3 TS over UDP
6.1.3.1 Measurement block diagram
The measurement block diagram is shown in Figure 13.
System under test
TS over UDP
Video tester
Playout server
Encoder
Test material output signal
Figure 13 TS over UDP input interface characteristics and data format measurement block diagram
6.1.3.2 Measurement procedure
The measurement steps are as follows.
a) Connect the test system according to Figure 13, convert the material in Appendix D into TS over UDP media stream and input it to the system under test;
b) Configure the process parameters, set the output encoding format to MPEG-2, and optionally package it
c) implementation of processing;
d) Use a video tester to test the output signal of the system under test (if the output is a stream or a file, it needs to be collected and played back as an HD-SDI signal)
Video channel characteristics and recording.
6.1.4 AES/EBU
6.1.4.1 Measurement block diagram
The measurement block diagram is shown in Figure 14.
System under test
AES
Video tester
Playout server
De-embedder
Output signal test material
Figure 14 AES/EBU input interface characteristics and data format measurement block diagram
6.1.4.2 Measurement procedure
The measurement steps are as follows.
a) Con...
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