You could deinterlace your files first and then encode it as progressive.
720x576x50 is much blurry, because 720x288x50(25i) needs lower bitrate to encode.. I don't need to buy some on 3700x ryzen wich convert 1 hour of video for 5-7 min h.264...There are nothing in my life to decode, DV only, just because tape can die, and 25mb\s avi is too fat. That topic it is just theoretical boring thoughts ))))