50 Pack Acoustic Panels Soundproof Studio Foam for Walls Sound Absorbing Panels Sound Insulation Panels Wedge for Home Studio Ceiling, 1" X 12" X 12", Black (50PCS Black)

Q: my family is on my back about playing games at night because they can hear me talking. if i put these on my door and walls next to me will they not

It won't completely drown out the noise. They will hear more of a humm or mumble. But it definitely makes a difference.

Q: will help noise cancel from the outside? i record presentations in a room.when people talk outside, you hear them from inside?

It will reduce any kind of ambient noise. That said, it will not do that job well. It’s meant to reduce sound reflected between your inner walls, not reduce sound coming THROUGH the walls,

Q: Will these help the acoustics in my dining room if I place them behind my framed artwork on the wall?

The idea behind foam pads is to absorb sound to stop it from bouncing. Think audio enhancements, not soundproofing. In your example, they won't do much as they are not directly exposed to the sound coming at them and cannot absorb it. The artwork would block them and, depending on the framing and artwork, possibly reflect the sound.