User guide

SiraView User Guide
11
Quicktime Export
The QuickTime MOV file export can provide the highest picture quality (by selecting the high picture
quality option), or can produce a small file (by selecting the “Small file size” option). If you must
export video from SiraView, we recommend using the high quality mode QuickTime file.
Image Quality
High quality video – optimises the output for picture quality. This will produce large files,
but the image quality will be good. Note that even high quality involves some loss of
information inherent in recompressing the video into a different format.
Small file size – optimises the output for file size. This will produce images of noticeably
reduced quality; however the trade off is that the resulting file will be much smaller –
suitable for sharing across your network or via email etc.
Video Options
Leave space around image for time/camera information – reduces the image size and adds
date/time information at the bottom.
Expand video to fill screen – makes the image fill the screen.
Resize to fit into a PAL frame’s safe area – the image is resized to fit into the designated
safe area of a PAL video frame.
In all cases the original aspect ratio of the image is preserved.
DVD Export
The DVD exporter can generate an ISO file which can be burnt using most DVD burning software.
The DVD format has some serious limitations when used for CCTV footage: fixed frame rates and a
limited range of valid image sizes.
To make a compatible DVD, SiraView must resize the image to fit the 768 x 576 size specified by the
DVD format, and must also duplicate frames to attempt to re-time the video to fit the 25 frames per
second rate required by DVD players.
Re-timing the video by duplicating frames cannot be done with high accuracy, therefore the video
playback will be affected. Motion through the video may be jerky, and overall playback time may be
less than or greater than the original video. For these reasons, we do not recommend using the DVD
format to store and display CCTV footage.
Video Options
Leave space around image for time/camera information – reduces the image size and adds
date/time information at the bottom. This option is recommended as a way to avoid
problems with overscan on some televisions clipping the edges of the image.
Expand video to fill screen – makes the image fill the screen. In both cases the original
aspect ratio of the image is preserved.