Hi,

This patches bring support for video devices on OSX platform.
Implementation is based on AVFoundation framework and is fully 
ARC (Automatic Reference Counting) compliant.

It adds a new indev device, named avfoundation.

AVOptions are:

- list devices and and available pixel formats
- video device selection by device unique ID
- pixel format selection
- video size selection
- frame rate selection

Usage examples:

avconv -f avfoundation -i default out.avi
avconv -f avfoundation -video_size 320x240 -framerate 15 -i default out.avi
avconv -f avfoundation -i default out.avi
avconv -f avfoundation -i -pixel_fromat bgra "DEVICEID" out.avi

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