I updated my 64bit Arch Linux system the other day, which updated my version of ffmpeg. I then went and tried to update my build of Panda3D (from SVN since I’m using this PKGBUILD) and now it seems to be failing due to something to do with ffmpeg.
I did a --verbose with makepanda and posted the log on pastebin: pastebin.org/337645
My ffmpeg version is revision 23619 which I installed from the official Arch repos and I believe it corresponds to the new 0.6 version of ffmpeg.