Athough it may seem simple to do that, it’s not actually.
The only commercial product that I know of is AVerMedia TVBox (look under Products => TV Tuners/PVRs => AVerTV Box 9 and AVerTV Box 7). They don’t have SCART as input but you can easily overcome that by buying scart-to-svideo or scart-to-component adapter.
Hope this helps.