abych to rozresil ... staci pouzit Google ... za zhruba tri vteriny (s napsanim, vyhledanim a kliknutim na odkaz) sem nasel vcelku jasnou odpoved

Citace Původně odeslal někdo od Canonu
Canon does not advise you using your camera as a web-cam. This is for the simple reason that the camera is not designed to take rapid photos over a long period of time (the resulting actions would overheat the camera).

The Remote Capture software included on the Canon Digital Camera Solutions Disk provides the capability to take and store images remotely using your computer via the USB connection. This is not the same as providing real-time, live video feed to a web server.

The picture resolution capabilities of your Canon digital camera far exceed the requirements of even a high-quality webcam.

We recommend you to get a built-for-the-purpose webcam if you wish to send live video over the web. They are quite inexpensive, very easy to install and set up, and are designed for continuous use.
a je to z tyhle stranky

(btw. zadaval sem tendle klic ixus400 webcam driver tak se v tom jeste muzes pohrabat)