Hide a post format from my front page blogroll

Hi there!

I’m using my WordPress site as a magazine with the Twenty Fourteen theme. The problem is that whenever I publish a new post, wordpress display it in the main blogroll of my front page.

I want some post formats (like “video”, “gallery” or “audio”) to display ONLY into the Ephemera widget area (aligned to the right side of the screen), leaving the “latest posts” blogroll of my front page for the big reportages.

And I need to do all of that without any plugin, because my blog is not hosted on a dedicated server or a local server. So, I need some CODE to do that.

Thanks in advance!