I do not know what your resources are but fyi a commercial scan converter
starts at $500 and there seems to be no end to it. That is the price of a
cheap computer or a moderately expensive XVGA card with extras (like a
proper video output that can be fed to a video wall splitter that is much
cheaper than $500 probably).

hope this helps,

Peter

PS: Hint: usually buying parts off the shelf to build something highly
optimized like $SUBJECT will end up costing much more than the finished
product, even if development time is not counted in. So the short answer
is probably, look into high speed FPGAs with capability to interface to
SRAM or VRAM (and do not try to save too much money imho). You can
probably achieve 50MHz sampling using a 100MHz clock on the FPGAs and 10ns
RAM.

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