[FFmpeg-devel] [PATCH] Added function to obtain MSE of two frames and a filter to calculate the PSNR

[Roger Pau Monné]

Modified libavutil in order to add a new function to calculate the MSE
and created a new filter (vf_psnr) that calculates the average PSNR of
two input video files.

libavutil: added a new function called av_images_mse to calculate the
mean squared error (MSE) between two images.
libavfilter: created a new filter that obtains the average peak
signal-to-noise ratio (PSNR) of two input video files, this filter
makes use of the new mse fnction added to libavutil.
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