What is the very old cartoon that has a section with an lady in her rocking chair knitting and there also creepy black cat?

You're likely thinking of "The Old Mill Pond", a classic 1937 Silly Symphony cartoon produced by Walt Disney.

The scene you describe features a sweet old woman in a rocking chair knitting, while a creepy black cat sits on the edge of the porch. The cat's eyes glow eerily in the dark.

Let me know if you have any other cartoon mysteries!