By default DVR records at 1/4 your screen size. This is for performance reasons. Same with recording to WMV. This is quick and fast. These default settings can be changed however on the settings screen Settings > DVR and using the built-in converter to convert to anything you want. Turn off the Request Best Output Size and it will allow you to request a size. Read the tooltip on this setting for further details.
Sorry it took so long to reply. Thanks for the info. That helps.