Frame Rate Conversion - 2.4 English

Video Processing Subsystem Product Guide (PG231)

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2.4 English

Frame rate conversion is implemented by dropping or repeating frames. The DMA engine keeps track of four frame buffers that are being written to in a cyclic fashion. The read portion of the video data flow remains exactly 1 frame behind the write pointer. In case the incoming frame rate is higher than the outgoing frame rate, the write pointer advances more frequently than the read pointer, meaning that frames are skipped. Similarly, the read pointer is always one frame behind the write pointer even in case the outgoing frame rate is higher than the incoming frame rate. In this case, frames are repeated.