I am a new one to pd. I  want to create an interactive installation. The main idea is that the people with their movement are able to manipulate the speed of a video. I have a patch which understands the movement and translates it into frames. Managing the threshold and the blobsize the result is quite satisfying. The problem is that although I have done what I believe it's necessary, the speed of the video isn't synchronized with my movement. Is it a problem of the program or is something that I have done wrong? 

Thank you in advance.