AVFoundation player doesn't load HDV ( non-square pixels ) correctly.

https://forum.openframeworks.cc/t/issues-with-pixel-ratios-in-ofvideoplayer/22120/10

Test video is here:
https://www.dropbox.com/sh/t2rezaeeghyj581/AAAAkGZvI6uJmG6KYOKEFCNUa?dl=0

On initial research the way to get the true size of the frame is:

CVImageBufferRef imageBuffer = [videoPlayer getCurrentFrame];
  int realW =  CVPixelBufferGetWidth(imageBuffer);
  int realH = CVPixelBufferGetHeight(imageBuffer);

The problem is that this info comes in later ( once the first frame is delivered ).
So for texture playback we need to change the texture coords based on the difference between the reported width ( 1920 ) and the pixel width ( 1440 )

For getting the pixels out we would need to figure out whether we should return the pixels as they are ( 1440 x 1080 ), or scale the pixels up which would add overhead.

ping @i-n-g-o @openframeworks/macos