I use a 7180 decoder and a 7179 encoder, with a FPGA between them to add graphic overlay on the image.
The overlay is colored and in some applications the incoming video is Black&White.
The SFL signal of the decoder is connected to the RTC pin of the encoder via the FPGA with adjusted delay of some LLC clocks to
compensate for video data delay. The RTC may be enabled or disabled in the encoder.
In some cases the output picture is ok, in others (different video source) I do not have the overlay in color but also Black&White.
1. Does this depend on the output video format (Composite, Y/C, R/G/B) ?
2. Please advise what to do.