VPS Signaling
User Parameters Codec
VPS Stereo Mode VPS Dual Channel Mode Mpeg2 HE-AAC / AAC AC3
Single MONO LEFT
Dual DUAL MONO
n A bit is signaled when it is set to 0. This is due to the fact that bits 5-8 are usually set to 1 to indicate an
unenhanced VPS.
* If a codec is not supported then the codec will always use the configured coding mode.
6.5 Vertical Blanking Interval (VBI) and Ancillary (ANC) Data
The video stream ingested through the SDI/HD-SDI input on the VCM can carry
additional data associated with the video stream. These data are either inserted in
the horizontal or vertical blanking region (ANC) or in the non-active television lines
(VBI).
6.5.1 Ancillary Data
There are two positions in the video stream where ANC packets are allowed. The
first is the horizontal blanking interval of the video line, called the horizontal ANC
space (HANC). The second is the active portion of the video lines in the vertical
blanking interval, called the vertical ANC space (VANC). HANC and VANC of the
SDI signal can carry specific ancillary (ANC) data. The encoder then can be set up
to extract and repacketize the data carried in the HANC or VANC based on the ANC
data type.
6.5.1.1 Closed Captions
Closed Caption data and any user data embedded in the SDI/HD-SDI according to
SMPTE 334, is extracted and inserted into the picture user data of the video stream
in accordance with ATSC A/72 part 1.
Information regarding the closed captions is carried in PSI as per ATSC A/72 part 2.
6.5.1.2 Time Code
Time code is extracted from HANC of the incoming video and carried in the
Transport Stream adaptation layer as described in Annex E of ETSI TS 101 154
(AU_information).
6.5.1.3 OP-47
Teletext subtitles can be extracted from ANC in accordance with OP-47 and carried
in a teletext PID.
To Next Page
Loading...
