3. For each data component whose bit rate cannot be determined automatically,
select the maximum bit rate in the output transport stream to allocate to that
component. Also, for transcoded SCTE 27 and repositioned DVB subtitle
components, select the Subtitle position of the output DVB subtitles.
Figure 3.41 Transcode Service – Data Component Additional Configuration
3.7.17 Teletext Processing
Teletext input over SD-SDI arriving as data in the vertical blanking interval can be
processed by the AVP 4000 and converted into a teletext component as part of a
service on the Transport Stream output, or converted into a DVB subtitle component
as part of a service on the Transport Stream output.
3.7.17.1 Teletext to DVB Subtitles Translation
The teletext arriving in VBI is a data stream represented by digitized analog
waveforms. A DVB subtitle component comprises of a bitmapped picture presented
by the end user’s set-top box or television set as an overlay onto the video. The
AVP 4000 is able to convert the teletext data into such a bitmapped picture using a
built-in font based on the open source font ‘free sans’.
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