Use the pipe ‘|’ symbol to add different options.
Whenever you find explanations on the VLC forums they will use either ‘–’ (this is how you add options if you start vlc from the command-line) or they will use ‘:’ (when used from within the program).
I have chosen to separate options with ‘|’, so in order to enable deinterlacing you should use:
dvb-t://frequency=490000000:bandwidth=8 | deinterlace=1 | deinterlace-mode=blend
So all command-line options found here, shouldn’t be sparated by --, but by |.
Also, you didn’t follow my example closely enough, as I use ‘=’ to select the program, and I used programs instead of program (allthough I don’t know if that matters here)
not
program:1234
but
programs=1234