After installing again, I found that I was getting the same problem as before; namely that I was able to see the webpage (http://dietpi/dietpicam), but was not getting any camera feed or preview.
I tested the camera by using the raspivid command and found it working OK, so I then went back to the RPi-Cam-Web-Interface documentation and found the following under Troubleshooting:
I then entered the command raspimjpeg into the command line and voilà! The camera immediately lit up and the preview appeared in the webpage.Web interface starts up but just shows 'Loading'. There are a number of causes for this but most are caused by the core raspimjpeg process not running or not running correctly.
Were you aware that DietPiCam was not automatically starting raspimjpeg?
Can this be fixed?
My suggestion would be to start raspberrymjpeg as a service ie. create an init conf file.
Also, I see that you forked this from silvanmelchior's project quite a while ago and I have noticed that there has been quite a lot of development going on over there. Might it be time to have another look and bring this version more up-to-date?
Thanks for all the hard work,