2.2.1 fixed this issue for me. I no longer see "This muxer is missing". The 3.0 nightly from 2015/5/3 did not fix it.
I'm on Windows 8.1 64-bit. I tried the 32 and 64 bit versions of 2.2.1 and both fixed the issue. I only tried the 32 bit version of 3.0.