Grass Valley K2 ASI Media Client - Manual (Page 36)

36 K2 ASI Media Client User Manual June 10, 2008
Chapter 4 Inputs Management
Histogram View
The Histogram view gives the current rate for each service of the selected input/
output. The current rate is indicated to the left of the histogram. The maximum rate is
indicated to the right of the histogram. The maximum rate of a service is the maximum
rate of the service since the video server was started and the service found (computed
rate).
The Histogram view is available for the following items:
• ASI input
• Record action (manual record or record list)
To reach the Histogram view, select one item, then click the Histogram tab
Performing Analyses
A number of analyses can be performed for each incoming stream and output services
independently. Analysis results are logged to the
Logs view.
If an analysis error is raised on a service, an overlay is displayed over the decoded
picture or logo. See the
“Symbols & Icons” section for further details on the symbols
and color codes used.
Each analysis can be enabled or disabled. By default, all analyses are performed,
except the Service rate analysis and the Picture freeze analysis.
Analysis label Detail
Table coherence Consistency in the MPEG-2, DVB or ATSC tables (e.g. PMT
declared in PAT but not present). This analysis is performed on a
stream (i.e. for all the services of the stream). If this parameter is
modified for one service, the modification is applied to all other
services in the stream.
PID presence Presence of listed PIDs is checked. If one PID is not detected during
1 second, an alarm is set.
Video decoding When enabled, video is decoded periodically provided the service is
not scrambled. The refresh period depends on the number of services
that are managed by the video server.
Picture freeze If a picture does not vary (i.e. is frozen) for more than a user-defined
duration, an alarm is set. This parameter is only available if video
decoding is set. If a null value is set, no test is performed.
MPEG transport flags Presence of MPEG transport flag is checked in the stream. These
flags are TEI (Transport Error Indicator), CC (Continuity Counter)
and DI (Discontinuity Indicator).
Service rate If the sum of the component rates differs too greatly from the
analysis rate (i.e. tolerance to given bit/s), an alarm is set.
Transport stream rate If the rate computed from the PCR differs too much from the analysis
rate (i.e. tolerance to 100 Kbit/s), an alarm is set. This analysis is only
performed if the Table Coherence is checked. This parameter is the
same for all services of a single stream.