You may also need NTSC to PAL conversion. Both NTSC and PAL can exist as composite video, S-video, Y/Pb/Pr component video, and RGB.
The best results are had by de-interlacing (making the original material progressive scan) first, then converting to the other scan rate, then re-interlacing if necessary. If the material started off as composite, it should be comb filtered and made into S-video, and then made into component video or RGB prior to de-interlacing.
I do not know what NTSC-PAL converters do things what way. If de-interlacing is not done first, often the result is a much softer picture due to mixing the corresponding even and odd scan lines from adjacent fields.
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