TVU One TM1000 v2 in V6.0 Set Up and Operating Guide
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PPENDIX
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T
ROUBLESHOOTING
V
IDEO
Q
UALITY
Troubleshooting Video Quality Using the Status indicators in
Normal and Advanced Modes
The Status counters offer a visual indication of specific technical aspects of the current live ses-
sion. By interpreting these numbers it is possible for an operator to troubleshoot and optimize
the quality of a session.
Quality
This is the real time effective bitrate of the transmission. If the system is set to VBR
(variable bit rate) mode, this number will fluctuate between the configured maximum
bitrate and the lowest bitrate the data connections can currently sustain. The maximum
target bitrate is set by either using a preset mode in normal operation, or by using the
bitrate slider in advanced mode.
If the system is set to CBR (constant bitrate) this number will stay constant.
Error rate indicators
Error rate 8s. This indicates the percentage of uncorrected errors taken over an 8 sec-
ond average. The aim is for this number to always be at zero during transmission.
Error rate 1s. This indicates the uncorrected error rate over the last second. The aim is
for this number to always be at zero during transmission.
All uncorrected errors can contribute to undesirable video glitches. Any error rate
greater than 0 indicates that the data connection is unable to operate cleanly in the cur-
rent data environment. If attempting to operate in CBR (constant bitrate) mode try ei-
ther lowering the required bitrate or switching to VBR to allow the system to adapt dy-
namically to conditions. If the system is already in VBR mode try increasing the delay to
allow the error correction system more time to adapt to the network conditions.
Line quality indicators
Line quality shows the current error correction levels required for error free transmis-
sion at the configured settings.
Line Quality 8s: This is the level of error correction (as an average over the last 8 sec-
onds) required to sustain clean transmission.
Line Quality 1s: This is the current level of error correction the system is using to sustain
a clean transmission.
The TVU Transmitter uses multiple methods of error correction to ensure smooth clean
video transmission in very challenging environments. Since the underlying network con-
