Gallery2: Fix force close issue when mute some videos

- only support mp4 and 3gp format

Change-Id: I748569864565dd5580784ec8b0214f3f3e253415
CRs-Fixed: 642145
Gallery2: Fix cropped picture cannot be saved.

When click the saveButton to save the cropped picture,
We found the source picture uri and the cropped picture
uri are the same,which cause the cropped picture can
not be saved.

Closed file Stream of mInStream before re-open it
for the same file.

CRs-Fixed: 622666

Change-Id: Ifcaa39ea76c141021259fad891411c59f7587903