There are 8 clips, one for each breathing cycle.

Greenscreen: http://www.mediafire.com/?qzewwoa4ao7aoc6
Warning: the alpha files are freaking huge. Can't find how to render them at a smaller size...
Alpha part 1: http://www.mediafire.com/?m8bi6ybhvdid5lc
Alpha part 2: http://www.mediafire.com/?1c36ugb8zk3zzxo

Based on teiptr vector @Deviantart.