[android-developers] Facing problem while playing video on emulator

Hello,

I am new to Android and learning it.

I have tried to play video on my emulator from sdcard having extension
as .3gp and .mp4, both are not working properly. There audio i can
hear but it shows video as still image and after some time it gives
error like "Sorry this video can not be played".

Please help me out in this problem.