User Manual

Camera Controls 97
Prerecording
Prerecording is available when the camera is configured for ProRes
TM
recording.
Select PRERECORDING to adjust prerecording parameters.
Prerecord Select to toggle prerecording mode On or Off
Buffer size Select to set the buffer size. Following buffer sizes are avail-
able:
•
220 MB
•
660 MB
•
1100 MB
Calculated dura-
tion
Shows the prerecording duration that is derived from buffer
size, codec and current fps.
When prerecording is enabled, press the record button once to start prerecording.
Active prerecording is indicated by a yellow PRE in the status overlays on EVF and
MON OUT (if enabled) and on the HOME screen. As long as prerecording is running,
the ALEXA writes images, audio and metadata into a ring buffer of the duration shown
under Calculated duration. During this time, the clip duration increments. When the
buffer has filled up, the clip duration stops incrementing and the oldest data in the
buffer gets overwritten. This process continues as long as prerecording is running.
Note that the remaining time will continue to decrease for some seconds after the clip
duration has stopped incrementing (i.e. the buffer has filled up). This additional space
on the media is reused once recording is started.
Press the record button a second time to start regular recording. All data that has
been gathered during prerecording is prepended to the clip.
Press the record button again to bring the ALEXA back into standby.
NOTICE
•
The calculated duration depends on buffer size, codec and currently set
framerate. Changing either of them will change the prerecording duration.
•
If the beeper mode has been set to Start or Start+Stop, the ALEXA beeps
only on prerecording start, but not when going from prerecording to recording,
otherwise the beep would be recorded when audio is enabled.
13.1.5.2 Monitoring
Select the Monitoring submenu to adjust parameters for monitoring on the EVF-1
and the MON OUT 1/2/3 output. These outputs are meant for monitoring and not
recording.