Frame Rate Control (Video Formatter)
The frame rate of the formatted videos stream can be reduced by adjusting the Decimation element.
where full frame rate is:
- 29.97 Hz for 525-line television systems
- 25.00 Hz for 625-line television systems
Decimation is any value within [1...150]. By default, the value is 1. You can modify the value at anytime even during the acquisition.
This simple decimation method offers the theoretical advantage of a constant interval between captured frames.
However, in case of congestion of the output path, the frame rate control circuit may occasionally increase the interval between captured frames. Such occurrence is not signaled to the application.
To minimize the risk if a congestion of the video encoder output path, the available output bandwidth is first allocated to the video encoder output path, the remaining bandwidth is allocated to the video formatter output path.