Operation Manual

47
Active Format Description
The B264 can extract Active Format Description (AFD) information from the incoming video
signal and insert it in the compressed bitstream. AFD information can be extracted from the
following sources:
 For SDI signals, AFD information can be present in the VANC as per SMPTE-2016-3.
This is the primary way of conveying AFD information on a professional video feed.
 For SD signals (either from Composite or SD-SDI sources), AFD information can be
synthesized from Wide Screen Signaling (WSS) data present in the VBI (line 20 for
NTSC signals, line 23 for PAL signals).
 The B264 also has the option of inserting a user-defined AFD code (instead of receiving
it from the video input).
The AFD controls are as follows:
 Enable AFD: Check this box to enable AFD extraction and insertion. This control is
always available. AFD is inserted in the video elementary stream as per ATSC A/72 and
ETSI TS 101 154.
 AFD Source: This controls where the AFD information is coming from. The options
are:
o Line 20 WSS/Line 23 WSS: This option causes the encoder to synthesize AFD
information from WSS. It is available only if the input resolution is SD or if the
video input settings are auto-detected. It will be displayed as Line 20 for NTSC
and Line 23 for PAL. For PAL inputs, the conversion follows ETSI TS 101 154
Appendix B.4.
Closed-Captioning Disabled
Input Source: SD-SDI
Input Resolution: SD
or
Video Input Settings: Auto Detected
Input Source: Composite
Input Resolution: SD
Input Source: HD-SDI or 3G-SDI
Input Resolution: HD