HD Video Test Clips and Scaling

It seems the previous download sites for HD I mentioned are not available. Now HighDef forum provides some test clips at

http://www.highdefforum.com/high-definition-movies-video-clips/6537-official-hd-video-clip-list.html

Media College also provides some free 720p and 1080i clips:

http://www.mediacollege.com/downloads/video/hd/

We still can use the video format conversions in

http://hdfpga.blogspot.com/2008/12/hd-video-test-clips.html

The latest ffmpeg binary can be downloaded at

http://ffmpeg.arrozcru.org/autobuilds/

For video scaling, a command likes

ffmpeg -vf "scale=640:480" -pix_fmt yuv420p -s 480x272 -i 480x272.yuv -pix_fmt yuv420p 640x480.yuv