Nexus 7-Facing an error with video playback -unable to play video

Hi,
My Nexus 7 just started showing a problem in playing the videos. When I take videos with the camera app, I get error messages when I try to playback those videos on the phone. If I try to playback from the Gallery, I get "unable to play video". If I try to playback from within the camera app, then nothing happens.
Can you guys help me out of the situation?

Hello friend,
Well this kind of error arises due to the format. Many phones doesn't support all kinds of video formats. There are many video formats like 3gp,HD and many other. You need to convert into the format that is supported by your phone. Then you will have no problem.