4:20

SMPTE LTC Reader & Generator for iPhone and iPad

4:20 is an SMPTE LTC timecode reader and generator for iPhone and iPad. It reads timecode from a wired audio input and shows lock, frame rate, drop frame, measured rate, direction, and level. It can generate LTC at the same time, over the same connection.

The reader is made for troubleshooting. When a rig will not chase, plug into the line and check the code where you stand: the rate as measured against what the source claims, drop frame or not, which direction it is running, and how hot the line is. Between cues, it works as a confidence monitor on any line you need to trust.

Reader

• Lock state and a full readout: frame rate with drop frame flag, measured rate, direction, level
• Runs continuously and keeps reading through route changes and interruptions
• If iOS takes the audio session away, the readout dims and says so instead of holding stale numbers

Generator

• 23.976, 24, 25, 29.97 drop frame, and 30 fps
• Start from any timecode, or generate time of day
• Output level control, with left, right, or both channel routing
• Anchored to the system clock, so long runs hold their time
• Runs alongside the reader for loop-through checks
• Warns before sending LTC to a speaker, Bluetooth, or AirPlay, and requires a press-and-hold to override

Requirements

A wired audio connection: a class-compliant USB audio interface, or a headset-jack adapter with a line input. There is no microphone mode. This version reads and generates LTC only; MIDI timecode is not supported.

Privacy

No account, no analytics, and no network connection. Nothing leaves the device.

Made for production sound, playback and show control, video engineering, DIT carts, and broadcast maintenance.

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