[libav-api] AVFrame/AVPicture Editing

[Mark Kenna]

Hi Guys

I have 4 AVFrames holding YUV420p data and I want to join them together 
into a single AVFrame for encoding, in effect tiling the output like so:

[ ][ ]
[ ][ ]

Is LibAv able to do this without first converting to RGB and splicing 
them together?

Thanks,
Mark.