Ericsson AVP 3000 Series - Ancillary Timecode (ATC) Not Extracted and Placed into the VBI Data PES; MPEG-2 Video PES Per GOP Option Removed; No VITC Control of Timecode; Video Index Operation and Active Format Description (AFD) Problems

Preventive Maintenance and Fault-finding
EN/LZT 790 0023/1 R16A
8-13
8.5.7.3 MPEG-2 Video PES per GOP Option Removed
MPEG-2 video PES per GOP may be removed from the GUI as it is not
recommended by DVB and PES per picture is mandatory for ATSC (see extract
below).
Extract from ETSI TS 101 154 V1.11.1 (2012-11). Digital Video Broadcasting (DVB);
Specification for the use of Video and Audio Coding in Broadcasting Applications
based on the MPEG-2 Transport Stream.
4.1.6.9 Multiple video pictures per PES packet
For MPEG-2 video Bitstreams, while there is no restriction against multiple video
pictures in a single PES packet, there may be some MPEG-2 decoders that do not
support this.
Encoding: The encoder should not put multiple video pictures in a single PES
packet.
Decoding: The IRD may be able to accept and decode bitstreams which contain multiple
video pictures in a single PES.
8.5.7.4 Ancillary Timecode (ATC) Not Extracted and Placed into the VBI Data PES
The ATC is not a VBI component and is not part of the VBI in separate PID (VBI in
PES). The ATC is only present in the MPEG-2 Sequence/GOP header in MPEG-2
or the H.264 SEI message in H.264.
8.5.7.5 Video Recovery Delay When Switching MPEG-2 to H.264
It can take up to 30 seconds for the encoder to switch its output from MPEG-2 to
H.264. We recommend the configuration is not changed during this period.
8.5.7.6 No VITC Control of Timecode
The TC mode on the VBI page controls the timecode mode on the Video PES and
does not control the output on a separate VBI PID (VBI on PES), The only control
for VBI on PES is the presence of the VBI component and the selection of the
appropriate VBI line as VITC.
8.5.7.7 Video Index Operation and Active Format Description (AFD) Problems
For Video Index operation a difference may be observed in AFD operation between
VBI PES and AFD in the SEI. For pass through of the Video Index line in PES, both
the 1995 (3 bit AFD code) and 2008 (4-bit AFD code) versions are supported, i.e.
the relevant 4 data bits are passed through unmodified and can be interpreted as
either specification. For extraction of AFD code information from Video Index to SEI
message/Video User Data, the assumption is made that the 1995 specification is in
use in the encoder/decoder chain (3 bit AFD code only).