Ah, so you're talking about playback of the re-interlaced 576i stream.
You're probably missing the vertical lowpass. Are you watching this on a PC, or on a LCD TV set, or on an old-school tube TV?
Code:
Lanczos4resize(720,576)
AssumeTFF() #choose the SAME field order like before deinterlacing
Blur(0,1).SeparateFields().SelectEvery(4,0,3).Weave() #reinterlace.
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