Solved!, was a problem with screen Width and Height. I have 2 videos sizes (W:720, H:540) for larges screens and (W:480, H:360) for smalls screens.
All devices i tried that are greater than small size, are greater than large size, so no problem.
The problem comes with L7 that have 480w x 800h pixels screen, so it's greater than small but not to enough from large, so seems couldn't resize the video to the large size and crash...
If i set the small size video, everything works fine.