[Mp4-tech] Downsampling and PSNR tools?

[Tuukka Toivonen]

On Mon, 19 Sep 2005, viraj ambetkar wrote:
>I just wanted to know whether there are any freely available tools for 
>downsampling (spatially and temporally) an original .yuv sequence. In 

Yes, Mplayer/Mencoder. It can read raw YUV files with option
-rawvideo and write into same format with options -ovc raw -of rawvideo.
Furthermore it has plenty of filters including spatial and temporal 
scaling.
>addition, is there a tool to compare the difference in PSNR (in dB) between 
>two sequences?

You could use my yuvtools:
http://www.ee.oulu.fi/%7Etuukkat/tmp/yuvtools.tar.gz
"yuvcmp" does what you want.
You might also search this list archives using Google
and about MPlayer; I've given some example command lines
previously.