pyuvssim computes the structural similarity (SSIM) between each frames of two raw YUV videos. As the name implies, it is written in python and for what it is, it is just slow as hell. Seriously. This code is just a proof of concept and shall not be used to compute SSIM between two videos. Its main purpose is only to be read by people interested to see how SSIM can be computed between two videos as python is pretty straightforward to read.

If you need to compute SSIM between two raw YUV videos, I suggest you have a look at VQMT (see project on Github) which is written in C++, uses OpenCV, performs way better (in the magnitude order of 1:100) and can provide other metrics as well (PSNR, VIFp, ...).

The SSIM module credits go to pyssim.