framerateNumerator property
Frame capture will encode the first frame of the output stream, then one frame every framerateDenominator/framerateNumerator seconds. For example, settings of framerateNumerator = 1 and framerateDenominator = 3 (a rate of 1/3 frame per second) will capture the first frame, then 1 frame every 3s. Files will be named as filename.NNNNNNN.jpg where N is the 0-based frame sequence number zero padded to 7 decimal places.
Implementation
final int? framerateNumerator;