I am using this command
sudo port install ffmpeg +gpl +postproc +lame +theora +libogg +vorbis +xvid +x264 +a52 +faac +faad +dts +nonfree
But the installed version of ffmpeg I get is only 0.7.13.
I am using MacPorts which may be the issue
Apparently there is a 1.0 release! http://ffmpeg.org/download.html#release_1.0
It's a "problem" with MacPorts. As you say, the last port version is 0.7.13. There is also a devel port but with a recent revision (5 weeks ago). You could also take a look here. This site seems to have a 1.0 static binary. It is a trusted website. Actually is linked in the official ffmpeg website.