Are European TV's and other devices compatible in Brazil?

Check the predominant voltage of the city/neighborhood where you're going to live for the appliances.  Many Brazilian cities have 127V power, compatible with North American but not European appliances; some have 220V, though, which should be fine.

In terms of adapters, the standard Brazilian outlet is now a 3-hole outlet, accommodating two power prongs and a ground, arranged in a flattened triangle.  The previous plug had two round prongs, similar to the one used in several European countries; many new outlets accommodate these plugs. 

Brazil's analogue TV system was compatible with Europe's, but Brazil went all-digital a couple of years ago, so I'm not sure about current compatibility.

Agree with adthree. Your plug and voltage in the home will be the only issue. The standard public tv installer, as well as a satellite installer, will help with having correct connections to tv and antenna.
Different here is installers do not carry parts, when they see you need a part they ask for money first then get part and return. (Or if you know what they are asking for and know where to go, you can go while they take a break???????
Same with landline telephones (if you get one). They are wired a little different

Power failures and power surges are more common throughout Brazil than you're accustomed to in the Netherlands.   Surge protectors for your computers and other valuable and hard-to-replace equipment are highly recommended.   If you bring them with you, you'll also need fewer adapters.

Very good point. I was glad I brought 2 surge protectors.
I also bought 2 here for my spouse's electronic equipment and every kitchen gadget made! 
Plus many homes and condos have one outlet per wall and using the strip stops fights over who can charge their phones when all the family comes over.
Think about it, one TV, but you want a sound system also, so an adapter to plug into, so a surge protector will give TV, sound and A lamp. (Now as said you need to look at home circuits, I had to "beef up "two breakers.)

British TVs do not work in brazil, it's to do with the analogue frequencies they can interpret. However, you CAN use them for internet related channels if you are doing things like chromecast or amazon firesticks etc..