DVD player shows NO DISC?

This problem is noticed by many dvd/cd player units.
how long have you been using this player? I suspect the laser (lens) of the player. I think the laser (lens) is weak that's why it cannot read data/files on DVD discs.

To confirm if actually its a laser problem, insert an Audio CD into the player and see if will play. If it plays, then obviously, your laser (lens) is weak. But if it doesn't play Audio CD, then it might still be the laser (lens) or a mechanism problem.

Get a lens cleaner, use it to clean the lens. If that doesn't solve the problem, get a screw driver, open the player's cover so that you can gain access to the lens, use a cotton board to clean the surface of the lens. This should clean dust or dirt that might be on the lens.

If non of the above solves the problem, then know that you need to replace the laser to a brand new one.

To replace the lens, remove the bad laser, use it as a sample to get exactly the same type and do the replacement. Note that replacing a laser (lens) needs a professional touch, so if you cannot replace the laser, get it to a repairman to fix it for you.

Once this is done, your player will play all DVD discs again.
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How to View MJPEG IP Webcam?

You can even view the MJPEG IP Webcam without using browser.
There is a procedure,follow it to view MJPEG IP Webcam.
You have got yourself an IP Web cam.Maybe a Foscam, or a Tenvis, or whatever, now most, if not allm only allow one to see the images via a browser.. IE, Chrome, Firefox, now that's all good, but wouldn't it be nice if you could have the image in a single resizable window? Well now you can... a remarkable piece of software called PotPlayer, is a terrific piece of software for ALL your video and imaging needs, not only does it work on every other receiving format, it does Analog, DVB-T & DVB-S, as well as DVD too, not only all of that, but it will do the IP Webcams as well. You will need to obtain the direct show filter though, called IPCameraDS.exe, download and install this, and then using PotPlayer, simply set it all up, filling in the fields required, for your webcam, you can use either "Raw" mode.. or a "Template" mode.. setup is easy and pretty self explanatory, either way, soon you will have a window with the Webcam's images in it..now you cannot actually control Pan & Tilt etc, however you can see the image well enough, if you need to alter anything, then obviously one must then use the browser..But for just viewing the images, PotPlayer will do a great job, also you can use all the "other' features of PotPlayer too.

This above mentioned procedure will help you.