4.3.5 JPEG, MxPEG and Audio
The MOBOTIX camera provides two internal compression methods to show the live
images in the web browser:
• JPEG for creating single images without audio support
• MxPEG for fast audio and video streaming
The JPEG operating mode works with almost any graphical browser and does not
require any plug-ins. Similarly, displaying live video from single JPEG images (mo-
tion JPEG) with JScript works on almost any JavaScript-capable browser without
plug-ins.
The highly compressed and fast MxPEG video streaming with sound, on the other
hand, requires an ActiveX-capable browser (Internet Explorer on Windows) or the
MOBOTIX MxViewer for Windows (see section 4.10,
Fast Video Streaming
).
Every compression method of the camera has certain advantages and disadvanta-
ges regarding the frame rate and the quality of the transferred images (see also
section 5.5.6,
Compression Format and Image Quality
). It is important to under-
stand, however, that even though the camera runs on MxPEG, you can still view
and save JPEG images from a browser without plug-ins.
The camera will always deliver images to a standard browser without Java or
ActiveX plug-ins, independent of the selected compression method.
The MOBOTIX camera thus has the unique advantage that it can produce a fast
live video stream in MxPEG format, but it can also save single images in regular
JPEG format for FTP transmission or e-mails. Furthermore, you may set recording to
use either MxPEG video format or single JPEG images. Finally, the camera can pro-
vide single images or image sequences (motion JPEG) to any standard PC or PDA
without any software installation or plug-ins. The MOBOTIX camera can thus provi-
de video streams as MxPEG, JPEG and Motion JPEG simultaneously.
Selecting MxPEG, however, has a certain influence on the single images as these
are not shot as individual images at a specific point in time, but are combined from
several images that have been shot one after another. In principle, MxPEG will only
transfer those parts of an image that have been changed compared to the last
image, i.e. where movement has been detected.
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
www.mobotix.com • sales@mobotix.com • 10.10.2006
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Software Camera Manual Part 2
MOBOTIX offers two
compression standards:
• JPEG
• MxPEG
Simultaneously provides
MxPEG and JPEG
Note
In order to reduce the changes in the images to a minimum, most of
the video compression methods use slow exposure control. This is why
exposure in single images from an image stream cannot be controlled
as well and as quickly as with single JPEG images. When exposure
changes quickly, MxPEG video streaming may briefly produce overex-
posed or underexposed video.
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