[Libav-user] use sws_scale to flip frame?

["Matthias Bühlmann"]

I want to encode OpenGL realtime content. Now, OpenGL has the y axis flipped compared to ffmpegs coordinate system.

Now, as I need to run the frame anyway through sws_scale() to convert it from RGB24 to YUV420P it'd be great if I could also flip it here, so I'd save the overhead of additionally flipping it prior to encoding.

Is this possible?
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