Thanks for reply.
For script, it might help if you describe a bit more how you would want it to work. You want to start recording video when motion is detected over a certain area, and keep recording until there has been no motion for some period of time?
Yes, the basic that I could define the area of the detection and the sensitivity level, and keep recording when there is movement.
I have found following CHDK scripts:
http://chdk.wikia.com/wiki/Motion_Detect_Plus: works perfect for my needs when it comes to still images (photo), would be great with similar for video. I managed to run it on my G9.
http://chdk.wikia.com/wiki/UBASIC/Scripts:Lightning_script_--_Fudgey - MDFB2013.lua: possible to choose between photo and video, I manage to run it on my G9 but I'm not sure if it runs properly. I have difficulties in understanding the settings. Would be great with a guide for "dummies".
http://chdk.wikia.com/wiki/Birding_with_CHDK - DaveCam Script: seems to be the best script for what I want, but it doesn't work on my G9. I assume that script could be adapted to the G9?
When that is said I'm happy to get suggestions of other camera models that might be more suited for the scripts above.
What features do you expect to get from CHDK that you don't get from CCTV + DVR? I'd suggest creating a short list based on the non-CHDK factors like price, video resolution, zoom range and then post here and check the wiki and forum for any known problems.
The CCTV + DVR are quite costly, have relatively high power consumption, and takes more space (mini-DVRs is a good alternative but to my experience not so many brands have good video resolution).
Here is a list why I think CHDK might be advantageous:
1. Low price on the second-hand market.
2. High image/video resolution.
3. Powershot with extreme zoom range enables monitoring from a distance (i.e. less disturbance).
4. Low power consumption?
5. More flexibility (at least for those who know the CHDK scripting, doesn't apply for me....)
Although the cons might be:
1. Limited storage capacity, only 4GB?
2. Is it stable and durable? E.g. enable weeks of monitoring.
I might add more to the list.
Regards,
Kes