CREATE TABLE table_7595 ("Format name" TEXT, "Container" TEXT, "Video coding" TEXT, "Bit depth" FLOAT, "Color sampling" TEXT, "Frame size" TEXT, "Video bit rate ,  Mbit/s" TEXT, "Audio coding" TEXT)

What bit depth has 4:1:1 as the color sampling?
SELECT SUM("Bit depth") FROM table_7595 WHERE "Color sampling" = '4:1:1'
SELECT SUM("Bit depth") FROM "table_7595" WHERE "Color sampling" = '4:1:1'