SMPTE vertical interval timecode (compliant with SMPTE 12M)[1][2] Sync Timecode User bits Bit 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 4 8 User bits Frame number (0–23, 24, or 29) 10 1 0 10 20 D C 20 1 0 1 2 4 8 Seconds (0–59) 30 1 0 10 20 40 F 40 1 0 1 2 4 8 Minutes (0–59) 50 1 0 10 20 40 F 60 1 0 1 2 4 8 Hours (0–23) 70 1 0 10 20 S F 80 1 0 CRC bits (g(x) = x8 + 1)