Execute another installer silently within your Nsis installer

Question

I am trying to execute ffdshow.exe silently within my nsis installer but ffdshow doesnt seem to work with my method but MatroskaSplitter.exe and other installers have run silently with the same method.

File "..\Prerequisites\ffdshow_rev4515_20130612_clsid.exe"
ExecWait '"$INSTDIR\ffdshow_rev4515_20130612_clsid.exe" /S'

Answer 1

Are you sure ffdshow uses NSIS?

It looks to me like they are using Inno so you could try /silent or /sp- /silent /norestart.