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Technical Specifications
Closed Captioning
Makito User’s Guide, v2.1.0, Issue 01
272
Closed Captioning
The Makito supports capture, multiplexing and transport of Closed Captioning (CC) and
other Line 21 information over Composite and S-Video (with no 7.5 IRE setup on Line 21),
as well as HD/SD SDI input interfaces.
Closed Captioning data, as defined by the EIA-608-B standard, includes the following
services over Line 21 Fields 1 and 2 of an NTSC analog video signal: CC1, CC2, CC3,
CC4, Text1, Text2, Text3, Text4, and XDS (see
supports transport of all these services. [Note that Closed Captioning as specified by EIA-
608-B does not exist over PAL.]
Figure B-1
EIA-608-B Line 21 Services
Line 21 of each field can contain up to 2 bytes of information, which can be used by any of
the above services (not simultaneously but rather successively). With NTSC video at 30fps,
the maximum EIA-608-B mandated throughput represents:
2 bytes x 2 Fields x 30fps x 8 bit/byte = 960 bps
The block diagram below shows the workflow for video and CC data into the encoder.
Closed Caption 1
Text 1
Field 2
Field 1
Closed Caption 2
Text 2
Closed Caption 3
Text 3
Closed Caption 4
Text 4
XDS
Video+CC
Video
Encoder
Processor
Closed
Caption
Transport
Stream Mux
IP
Encapsulator
De-Embedder
MPEG TS
over IP