Troubleshooting KMU-100 Latency
Below are some tips to troubleshoot latency issues integrating KMU-100 into a workflow with HD cameras on separate inputs.
The scaling processing adds minimal latency, but other elements in the workflow can add up, and result in a picture that is not in sync with sound, or other cameras in the system.
A good way to record latency is to record a hand clap, and measure the frame offset between cameras in video editing software. CameraDoes the camera you are using have a latency on the video output? All DSLR and Mirrorless cameras have a delay, as well as many entry level and high end digital cinema camera.
A dedicated professional video camera with an uncompressed output will give the best results. The JVC LS-300 is a good example. MonitorMost consumer ‘TV' screens used as monitors will add delay. Computer monitors and LED panels with low latency are recommended. Switcher and ConvertersDoes the switcher you are using have a delay?
Try to eliminate using converters/splitters/repeaters between the main output and screens. Frame RateSet your camera to the same frame rate that the KMU is outputting.
For example: When outputting 1080p at 59.94fps on the KMU-100, set your camera to shoot at 1080p at 59.94fps. Shutter SpeedAlways double the shutter speed according to your frame rate.
29.97fps and 30fps should have a shutter speed of 1/60, 59.94fps and 60fps set to 1/120.