Subtitle Alarms - Ericsson RX8000 Reference Manual

Position
RIGHT BOTTOM
Note: There are times when subtitle graphics may be clipped from the right or left
3.17.3.7

Subtitle Alarms

If DVB Subtitle or Teletext Subtitle OSD graphics are too big to fit into the safe area
then a DVB Subtitle Alarm will be raised and the Error Status field shall show the
value SCALE. The graphics safe area is defined as 10% of the display width for the
left and right margins and 5% of the display height for the top and bottom margins.
Alarms will clear automatically when the conditions that caused the alarm are
removed.
SCALE
A SCALE alarm will be raised if the subtitles, after scaling, exceed the bounds of the
display rectangle.
OUT OF MEMORY
An OUT OF MEMORY alarm is signalled if the receiver runs out of graphics memory
and is unable to display the subtitles. If subtitles have been scaled, reducing the
scaling value may resolve the problem.
PIXEL BUFFER LOW
The receiver allocates 400KiB for decoding subtitle objects. If the size of an
incoming object exceeds this limit, the PIXEL BUFFER LOW alarm is raised.
NOT SUPPORTED ON 4:2:2 DECODER
It is not possible to decode and display subtitles whilst using the 4:2:2 decoder to
decode the incoming video data.
OVERLAP
An OVERLAP alarm may be raised if both DVB Subtitles and Teletext Subtitles are
enabled at the same time. Please select only one subtitle decoder at a time.
CLIPPED
A CLIPPED alarm is raised if the subtitle decoder detects an object is wider than the
display. The object is clipped to the display width.
EN/LZT 790 0005 R7A
Description
Subtitles are right aligned at the bottom of the graphics safe
area
hand edges. This typically occurs when using up or down conversion to
Center cut-out and the SD Screen Aspect Ratio is set to 4:3. This occurs
on the CVBS output but may occur on SD-SDI configured outputs. HD-SDI
configured outputs should be fine. If this is a problem then try adjusting the
Position and Scale of subtitles until the problem is resolved.
Using the Equipment
3-311