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Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GY/T 325-2019: Technical requirements and measurement methods for AV-IT system in TV stations file-based producing and broadcasting networks Status: Valid
Basic dataStandard 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---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. (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 ContentsForeword ... 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 ... 31ForewordThis 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 system1 ScopeThis 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 referencesThe 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 Protocol4 Program information exchange scenarios4.1 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 stream5 Technical requirements5.1 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-Intra2 DNxHD3 ProRes 422 4 MPEG-25 Linear PCM6 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...... |
