Check Kramer's website. I have a couple Kramer video DA's they are physically very small with 1 in and 4 out.
I also have some Horita's with larger outputs 1X6 if I remember correctly. They are half rack units.
I have a couple Ocean Matrix DA's the audio is rca, is the only thing about them that bothers me.
Hope this gives you some ideas, for small inexpensive units