I don’t have a player yet. How accurate is the preview window in SignChannel? Will I see the white screen and Quick Time logo when playing a video?

No you will not.  We included the preview to give you a rough idea of how your playlist would play. The output to your player will be as good as the content you upload. When you upload a video to SignChannel we trans code it twice. We create a small, low res video preview for the website, and a original size version for the actual player attached.