User guide

SiraView User Guide
7
Playback & Navigation
SiraView gives you precise control over the video. You can play the video forwards or backwards,
step through it a frame at a time, or jump directly to where you want to be.
Single frame step Fine position slider moves through frames one at a time
backwards / forwards
Pause and Play (1x speed)
The fine position slider can be used to step through the range of frames covered by the active
section of the coarse position slider.
Enter a time directly to jump straight to it
To call up the Jump to date/time dialog simply
use the File -> Go to time (Ctrl+G) menu option,
or alternatively click on the main time display or
use the keyboard shortcut CTRL + G.
Time Information
Having confidence in the time information available alongside CCTV footage is important in assessing
its value as evidence.
There are a number of general issues which can affect the accuracy of the time recorded by the
CCTV system: the time set on the recorder may simply not be accurate and/or the recorder may not
store information about daylight savings time (BST/GMT in the UK).
It is therefore essential that a good record is made at the time the CCTV footage is obtained as to the
relationship between the recorder’s time and the actual correct time. Even then, it is possible that
the time on the recorder has been altered between when the event was recorded and when the
footage is retrieved.
SiraView aims to do the best it can with the information available. Specifically, SiraView attempts to
show the same time information that the manufacturer’s own player would show.
The time view in SiraView operates as follows:
If the footage has a time offset (that SiraView understands), that offset will be applied to the time
displayed. E.g. if a piece of footage is recorded during British Summer Time, and SiraView can
determine that this is the case, the time shown in SiraView will also be in British Summer Time.
Red bar indicates selected region for
export, set by Convert – Set start Point
(Ctrl+N) and Set end Point (Ctrl+M)
Course position slider moves through
the entire video