The u and v channels cross over into each other on the right and cancel each other out in the middle so there's not much colour to be recovered there.
The following makes it look fairly natural:
Code:
ffmpegsource2("snip.mkv")
a = crop(0,0,360,0).coloryuv(cont_u = -100, cont_v = 150)
b = crop(360,0,0,0).swapuv.coloryuv(cont_v = -150)
stackhorizontal(a,b)