Ȩ > °í°´Áö¿ø > ÀÚÀ¯°Ô½ÃÆÇ.

Á¦¸ñ | ÀÚ¸·(caption, subtitles) 2021-08-20 1156
À̸§ | ¿î¿µÀÚ   (IP:106.241.248.165)      
÷ºÎÆÄÀÏ |
¸µÅ©ÁÖ¼Ò |


(¹ßÃé: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.
¹øÈ£ Á¦¸ñ ±Û¾´ÀÌ ÀÛ¼ºÀÏ Á¶È¸
 
173 MTS4000 Trigger Recording MTS 2025-04-17 52
172 Simulation of Classical & Quantum Communications over FSO Satallite Links ¿î¿µÀÚ 2024-05-16 230
171 WFM-InputTimingToReferenceTiming SYNC 2023-05-11 462
170 ECO422D AGL7 ¼³Á¤ »ç·Ê Telestream 2023-04-26 502
169 ECO422D Dip Switch ¼³Á¤ »ç·Ê Telestream 2023-04-26 472
168 Wirecast License Offline Actication ¹æ¹ý Wirecast 2023-02-10 1094
167 System Requirements for Wirecast (15.2.0) Wirecast 2023-02-09 637
166 Wirecast Webinars : Set up your Live streaming strudio Wirecast 2023-02-09 1203
165 PC ÃÖ¼Ò »ç¾ç VPIphotonics 2023-01-31 1178
164 Wirecast Access Plan Wirecast 2023-01-20 1243
163 How to identify PRISM model WFM 2022-12-22 579
162 352M, Payload Identifier Definition (Bytes:2~4) ¿î¿µÀÚ 2022-06-17 853
161 ÀÚ¸·(caption, subtitles) ¿î¿µÀÚ 2021-08-20 1156
160 ECO422D Dip Switch WFM 2021-05-27 1454
159 WFM Analog Audio ÄÁ³ØÅÍ ÇÉ ¹è¿­ WFM 2021-05-27 977
158 À©µµ¿ìÁî ´ÜÃàŰ À©µµ¿ìÁî 2021-03-05 1260
157 PRISM New UI TeleStream 2021-02-18 1797
156 TSCA, TR101290, PCRAccuracyError TSCA 2020-09-09 1456
155 MOS (Mean Opinion Score) Value MOS 2020-08-17 1393
154 IPTV Service Delivery Challenge IPTV 2020-03-19 1516
 
  1 [2] [3] [4] [5] [6] [7] [8] [9]  
Á¦¸ñ º»¹® ±Û¾´ÀÌ