https://www.cbssports.com/mlb/news/a...n-report-says/

You can jump to 2:55 to see Farquar pitching. The Astros banged a trash can whenever a breaking ball would be called for. You can see Farquar call his catcher out at 2:58 when it happened again to change the signs.

The issue here isn't the players stealing signs by a catcher not showing them. It's that they are using a centerfield camera to do it.