Google Chrome not able to identify my webcam

Chrome has suddenly stopped accessing my camera. Whenever I go to a website that tries to use my camera, I see a text that says camera : none available

When I go to media settings, I see that Chrome is not able to detect my camera, though the camera is working fine with Gmail chat camera test, and it works fine in Firefox too.

I am on Ubuntu 12.04 and my camera works fine. I tried it using a application called cheese

To quote the Google support article[1] (emphasis mine):

If you select Allow on a "http" URL your preference will not be remembered in future visits. If you select Allow on a "https" URL, your preference will be remembered in future visits. You can monitor which site is using your camera and microphone by clicking the camera icon or microphone icon microphone icon in your Windows system tray or Mac status menu.

Similarly, one will often see the video camera icon in Chrome's address bar during such requests, or of course the flash-based camera prompts.

So the question I pose is whether you're seeing this on a flash webcam site, or any that would attempt to use the webcam, such as an HTML5 website (a good one to test is here: http://wolframhempel.github.io/photobooth-js/).

If you verify it works with HTML5 and not flash, the culprit may be the flash plugin, or settings on that particular website.

[1] https://support.google.com/chrome/answer/2693767?hl=en