FOCUS Enhancements 3.2 - Manual (Page 79)

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Audio Data:Displays the amount of data currently in the MPEG
decoder’s audio data buffer.
Raw Data: Bytes of MPEG data in RAM.
Disk Underflow:Displays the number of disk underflows that have
occurred. A disk underflow occurs when the Firefly is unable to
get the data off the disk fast enough to keep the disk buffers from
becoming empty.
Data Underflow:Displays the number of data underflows that
have occurred. A data underflow occurs when the Firefly is unable
to transfer data into the MPEG decoder buffers fast enough to keep
them from becoming empty. Note that during regular playback
conditions it is normal to have a small number of Data Underflows
in this field
Diagnostics - Logging
At the top of the Logging page, from the “Select Logfile” drop
down menu, you can select the log file you would like to view.
The two buttons located at the bottom of the Logging page,
“Refresh” and “Auto Refresh”, allow you to manually refresh or
have the system automatically refresh the logfile data as you view
it.
Refer to Log File Reporting on page 115 for information on setting
up how your Firefly works with logfiles.
Run Logs
Run logs provide a record of which videos played (with which
graphic overlays, if applicable), on which channels, starting at
what dates/times, playing back what percentage of the video and
for how long.