1. DTVCC Data Interchange And Delivery
Currently:
- Proprietary caption data formats
- Proprietary command structures for encoders
Needed:
- Standard authoring format for interchange
- Standard device-ready delivery format
- Uniform encoder command structures 1

2. Authoring Format - Carries authors intentions
- Single file transformed into files for:
- EIA 608 (Line-21)
- EIA 708 (DTVCC native)
- Sub-pictures for DVD authoring
- Teletext
- Media (SMIL, SAMI, QTtext) 2

3. Authoring Format Sample
<Synchronized Text>
< Program progName=“Nova” epName=“Dying To Be Thin” frameRate=“30d”>
<Track trackType=“Caption” country=“US” language=“eng” easyReader=“false”>
<Caption speaker=”Narrator" startTime="01:00:00:02">
<CaptionPlainText>
<![CDATA[Food, the final frontier.]]>
</CaptionPlainText>
<CaptionPretty>
<Window vertical=“bottom” horizontal=“center” fillColor=“black”>
<Font size=“medium foreColor=“white” bgColor=“black”>
<![CDATA[Food, the <bold>final</bold> frontier.]]>
</Font>
</Window>
</CaptionPretty>
</Caption>
<Comment comment="This is a comment line in the file."/> 3

4. Device-Ready Format - Carries decoder-ready caption data
- Header area sufficient to define service
descriptors
- Timecodes represent finish-execution for
Pop-On, start-execution otherwise
- Human readable
- Encoding software wraps up all streams
in CDP, including Timecode, CC Data,
and Service for insertion 4

5. Device-Ready Format Sample
Timecoded-Data-Services
®BeginHeaders
Title = Nova: Dying To Be Thin
Nola = NV1307r1
Creator = Media Access Group, WGBH, Boston, MA
©STREAMDEF = F
StreamType = 708
Lang = eng
Country = us
Aspect = wide
EasyReader = false
Service = 1
©STREAMDEF = E
StreamType = 608
Field = 1
Channel = CC1
PairDoubling = YES
Level = EIA
®BeginData ™
†F‡88‡01‡80Narrator:‡0DFood, the final frontier.‡8B‡03
†E‡14‡14pTC-2 character set‡14,‡14/ 5