I'm currently using the SAA7108AE IC from NXP (Philips) for a video decoding and encoding application. The decoding part works well so there's no problem on this side. However, I have trouble making the encoder work. The encoder part of the SAA7108AE is pretty much the same as the SAA7105 (which is an encoder only).
Input to the encoder : ITU 656 stream (8 bits). 27 MHz clock
Output : NTSC
In the datasheet, they indicate how to take a progressive digital video stream and convert it to an NTSC signal. Basically they give us equations that are used to calculate the values that will be written in the encoder registers.
However, they mention in the vertical scaler equations that these equations are only valid for a non-interlaced input with an interlaced output. But they don't specify what are the equations when using a digital interlacted source for the input.
Does anyone here has any experience with that kind of application? I emailed NXP for support, but so far I haven't got any answer from them