Sink Filter handling

[gil]

Hi,
I built a graph using the Sink Filter in order to record videos.
At some point I want to close the file being recorded by the Sink Filter and delete it from hard drive, yet, I want the graph to keep running (and keep showing the video on the screen).
In order to achieve that, I used the ESF_EnableOutput with the "Sink to Null" parameter and try to delete the file, but unfortunately the file cannot be deleted because it is still being used by the filter.

How can I accomplish this task without stopping the graph from running?

All The Best,
Gil