Screenshot video in Adobe Air for Android

Hi, everyone. I have a big problem. I'm developing a digital signage app and is everything fine. Also, this same APP works in desktop. I take a screenshot each 2 minutes to all stage, the video is local. It works in desktop, but in Android it doesn't.
I had tried to pause the video and take the screenshot (using BitmapData and the method Draw) and the video turn black, so, when I get the screenshot it's only black. Please, I searched about permissions but it doesn't have sense because the video is inside the android device.

This is the code to get the screenshot

var foto:BitmapData = new BitmapData(stage.fullScreenWidth, stage.fullScreenHeight);
foto.draw(this);

After "foto.draw(this);" the Video Object turns black

Help me.