User guide

SiraView User Guide
12
Time Options
DVD does not support the variable frame rates commonly found in CCTV systems. To get the CCTV
footage to play back at a reasonable rate on 25 frame-per-second DVD it is usually necessary to
duplicate frames.
The DVD exporter gives you three options:
Playback at normal speed, but jump over large gaps – large gaps in the video (for example,
where an alarm-based system only records when something happens in view) are skipped
over. A “large” gap is defined as 1 minute long. When the time between frames exceeds one
minute, the last frame is held for one second then the gap is jumped.
Playback at normal speed, leave large gaps intact – large gaps in the video remain intact.
The frame prior to the gap is duplicated as many times as needed to fill the gap. When using
this option take care to ensure that there are no excessively long gaps in the section of video
you wish to export.
Playback at 25 fps regardless of original rate – each frame is displayed for 1/25 of a second,
regardless of the original frame rate. This option may be useful when the exported DVD is to
be imported into a video editing package and can be properly re-timed.
Keyboard Shortcuts
Some operations in SiraView can
be controlled using the keyboard.
Key
Operation
Space bar
Play/pause video
Left/right arrow keys
Go forward/back one frame
CTRL + O
Open file
CTRL + P
Print frame
CTRL + S
Save frame
CTRL + G
Go to time
CTRL + N
Set start time for video export
CTRL + M
Set end time for video export