> 고객지원 > 자유게시판.

제목 | 자막(caption, subtitles) 2021-08-20 323
이름 | 운영자   (IP:106.241.248.165)      
첨부파일 |
링크주소 |


(발췌:https://www.drastic.tv/solutions/170-closed-captioning)
* CEA-608: 608 was developed during the 1970s to carry caption and data services on NTSC standard definition video. It was designed to survive poor transmission, recording and re-recording while maintaining the caption information. It was encoded as a black and white series of pulses on line 21 of the first field of video and line 284 for the second field. Each field allowed two possible caption channels, allowing a total or four, known as CC1, CC2, CC3 and CC4. The total amount of data that could be transmitted was 960 bits per second.

* OP-42: OP-42 is a standard definition specification for transmitting captions on PAL (25/50 Hz) systems. It is based on a part of the Teletext specification that has since become the WST described below.

* CEA-708: 708 was developed to replace 608 for HD television transmissions. 708 actually includes the 608 bytes as a compatibility layer for older decoding equipment, but also provides a completely new, enhanced captioning system. 708 is transmitted digitally as part of the compressed HD DTV stream. It is allocated ten times as much space, 9600 bits per second, as 608. Like 608, the meaning of the captions is described in the Consumer Electronics Association docs. The transmission of the packets is described in SMPTE 334-1 (VANC video packet) and as an ancillary packet in SMPTE 334-2.

* WST: The World System Teletext is the formalized version of the teletext transmission system used to transmit information, subtitles, and news to televisions before the internet. This specification is still important, though no longer used directly, as it is the basis of OP-42, and OP-47 / RDD-08.

* OP-47 (RDD-08): OP-47 (known by SMPTE as RDD-08) is the European standard for subtitles and closed captions in HD. It has more capabilities than OP-42 and CEA-608, but not as many as CEA-708, as it is based on a limited spec from the larger WST specification.

* Subtitles: Subtitles are now also used as closed captions, especially for web distribution, where it is easier to distribute a series of text or XML files for each language for a show, rather than pre-encode them for automatic transmission.
번호 제목 글쓴이 작성일 조회
 
196 352M, Payload Identifier Definition (Bytes:2~4) 운영자 2022-06-17 101
195 자막(caption, subtitles) 운영자 2021-08-20 323
194 ECO422D Dip Switch WFM 2021-05-27 366
193 WFM Analog Audio 컨넥터 핀 배열 WFM 2021-05-27 395
192 윈도우즈 단축키 윈도우즈 2021-03-05 480
191 PRISM New UI TeleStream 2021-02-18 537
190 TSCA, TR101290, PCRAccuracyError TSCA 2020-09-09 741
189 MOS (Mean Opinion Score) Value MOS 2020-08-17 705
188 IPTV Service Delivery Challenge IPTV 2020-03-19 772
187 TR101290 Priority-II VBU 2020-02-04 733
186 TR101290 Priority-I VBU 2020-02-04 819
185 HD Video Format VBU 2020-02-04 790
184 SYNC: Embeded Audio Status SYNC 2019-04-08 824
183 SMPTE 352M VPID (Video Payload Identifier) SMPTE 2017-11-09 10823
182 SDI Data Rate SMPTE 2017-11-02 1085
181 SMPTE 2110-X SMPTE 2017-11-02 1175
180 류재윤의 '중국과 中國' 한국경제 2016-12-14 1559
179 [이장우의 성공경제]실패로부터 배운 7가지 교훈 전자신문 2016-12-14 1498
178 CJ헬로비전, 스카이라이프 - OTT시장 진출 ETNEWS 2016-11-29 1453
177 KT, LGU+ IoT 서비스 계획 ETNEWS 2016-11-29 1596
 
  1 [2] [3] [4] [5] [6] [7] [8] [9] [10]  
제목 본문 글쓴이