1. EvalVid Binaries for Calculation of PSNR and SSIM.
http://www2.tkn.tu-berlin.de/research/evalvid/fw.html
2. FFmpeg.
https://ffmpeg.org/
3. GERCOM.
http://www.gercom.ufpa.br
4. MP4Box.
https://gpac.wp.imt.fr/mp4box/
5. PSNR and SSIM Computation.
http://totalgeekout.blogspot.com/2013/04/evalvid-on-ns-3-on-ubuntu-1204.html