When playing interlaced footage using standard players such as VLC or Winows Media Player we get always 25 frames per second. The only freedom is we can choose a deinterlace method (which basically blends two frames into one) or play 25 (PAL) frames consisting of two half fields each.
When we watch broadcast tv, we get 50 frames (half frames), which gives us feeling of fluent motion. Is there any player which plays video exactly like in broadcast tv, so we get these 50 half frames, not 25? On a standard LCD screen.