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Technical Specification
B-10
EN/LZT 790 0023/1 R16A
VBI Data
Data can be extracted from the vertical blanking interval of the incoming video
stream, processed, and then included in the output Transport Stream. The following
table summarizes the VBI data types supported by the VCM module.
Table B.14 VBI Data Specification
Component Comments
Video Index It is possible to extract video index and another VBI type from the same
line.
Closed Captions Via line 21 & 284 (CEA-608C).
Monochrome 4:2:2 Up to 3 lines can be extracted per frame.
Teletext Up to 18 lines can be extracted per field.
Aspect Ratio Signaling WSS/WSS-AFD
VBI Data on a Separate PID
The VBI data is packetized into MPEG-2 PES packets according to ETSI ETS 300-
472 for Teletext and ETSI EN 301 775 or SCTE 127 for all other VBI data types.
Closed caption data and aspect ratio signaling can also be inserted into the
compressed video elementary stream.
Timing
The VCM aligns the VBI data and the compressed video frames, i.e. it uses the
same PTS for the video and the VBI data if they are from the same frame.
B.3.11 Video
B.3.11.1 Pre-Processor Metrics
Production
The VCM pre-processor, in conjunction with the first stage ME, analyzes the video
on a macroblock by macroblock basis and produces Pre-Processor Metrics on:
•
Activity - spatially
•
Complexity
•
Motion (vectors and SAD results)
•
Luminance level
•
Frame size information