Clock Adjustment

Audio and Video timing in vMix runs based on a single master clock running on the computer.
This clock may run slightly faster or slower than external equipment such as cameras and displays.
If this difference is significant, the Clock Adjustment setting can be used to compensate.


How to calculate the adjustment needed:

1. Add a Camera input to vMix from a capture card as either SDI or HDMI (not from a network source).
2. Open up Statistics and check the results for the Camera after exactly one hour.
3. Calculate the adjustment as follows:


Source Dropped only, (both Renderer Dropped or Resync must be 0)

Adjustment = -(SourceDropped * (1000 / CameraFPS))

For example a SourceDropped of 5 at 29.97fps would be -(5 * (1000 / 29.97)) = -167ms


Resync only (both Source Dropped and Renderer Dropped must be 0)

Adjustment = (Resync * (1000 / CameraFPS))

For example a Resync of 5 at 29.97fps would be (5 * (1000 / 29.97)) = 167ms


All other results

No clock adjustment required. Drops likely the result of other causes other than the clock (overloaded system, faulty devices etc)