I thought I knew the answer to this question, but a few posts recently have been making me doubt myself. What is the frame rate of a progressive scan signal? For example, let's say a PAL DVD player is correctly deinterlacing film material. Obviously there are only 25 pictures per second on the disc, but does it actually output it as 25 pictures per second, or is each one doubled up so that there are 50 entire frames per second being sent to the display? And what happens with 720p high definition? Is that actually 50 (or 60) distinct 1280x720 pictures per second, or is it actually only 25 (or 30) pictures?