I had attempted just changing the file extension and that didn't work. Adding the -f h264 did work, however. Thanks!
I'm still curious about the lavf thing though. I compiled all of my builds within the past month. I actually learned of the lavf support and that's what made me recompile x264 to include it. I made sure to go and get new source code for everything when I did, so unless something didn't get removed from my previous installs, it should be month old versions of ffmpeg, ffms, libav, lame, faac, and x264.
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