avfilter/vf_w3fdif: do not reset pts to 0

Shamelessly stolen from yadif.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
swscale: Use full resolution chroma for yuv2rgb when the input has full chroma

See Ticket3028

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>