YASM & NASM
From MythTV Official Wiki
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Summary
Install YASM
You want the Win32 .exe (for general use on 32-bit windows) (we don’t currently support win64 due to msvc lack of support for inline assembly)
yasm-1.2.0-win32.exe
Save the downloaded exe into a location you will add to the path.
Rename yasm-1.2.0-win32.exe to yasm.
Install NASM
You can either install the full version from http://www.nasm.us/
-or-
Copy yasm.exe and rename it nasm.exe
Just make sure with either approach, nasm is available in the system path.
