Video and Image Processing Suite User Guide

ID 683416
Date 4/04/2022
Document Table of Contents

16.3. Locked Frame Rate Conversion

The locked frame rate conversion allows the Frame Buffer II IP to synchronize the input and output frame rates through an Avalon memory-mapped slave interface.

The decision to drop and repeat frames for triple-buffering is based on the status of the spare buffer. Because the input and output sides are not tightly synchronized, the behavior of the Frame Buffer II IP is not completely deterministic and can be affected by the burstiness of the data in the video system. This may cause undesirable glitches or jerky motion in the video output, especially if the data path contains more than one triple buffer.

By controlling the dropping or repeating behavior, the IP keeps the input and output synchronized. To control the dropping or repeating behavior, you must select triple-buffering mode and turn on Support for locked frame rate conversion or Locked rate support parameters.