I didn't hear Jane enter/entering

[barnej0096]

Jane entered the room but I didn't hear that.
I didn't hear Jane.... enter/entering the room.

[5jj]

I didn't hear Jane.... enter/entering the room.

Both are possible.

[billmcd]

Jane entered the room but I didn't hear that.
I didn't hear Jane.... enter/entering the room.

Either one would be OK, but use of "enter" in that context could suggest an isolated event of limited/finite duration, whereas use of "entering" would suggest the "hearing" of the process was of a longer duration, perhaps from outside the room to some unspecified location in the room.