[Technologist]

Still suffering from the filmising and zooming of course though...

In taking a PAL SD picture into a HD raster you need to zoom a bit
to get rid of the half lines that otherwise Twitter with the interpolation.

Also as Rec601 line blanking is narrower 10.6666 usec than PAL, 12usec +- 500ns
some tidying up of blanking is needed
Hence the BBC using 704 (11.85 usec) not 720 active pixels on PAL originated Digibeta

And of course rec601 in both 576 and 480 lines and 16*9 and 4*3
does not have square pixels ….. so standards conversion to rec 709 can be a bit exciting !

But does not explain the softness deinterlaced and miscentred output !