Blackmagic design atem
highlights
supports 10-bit ntsc/pal/hd/uhd 4k
supports 4k resolution over sdi or hdmi
4 x 6g-sdi & 4 x hdmi inputs (4k/hd/sd)
tri-sync/blackburst ref. sync input
8 x built-in frame synchronizers
multiview monitoring in hd
program outputs in sd/hd/4k hd
1 x upstream & 2 x downstream keyers
audio: 10 x input, 2-channel mixer
hardware or software mac/windows