I demoed MythTV at the Charleston, SC Linux Users Group meeting September 18, 2010. One of the questions was how big are the files. MythTV doesn't show file sizes any where that I can see. You can run ls -l on the recordings directory but that is no fun. So, I combined some MySQL tables with the mediainfo command and created a spreadsheet. The mediainfo command provides all kind of information. See an example in the screen shot below.