"Interlaced" PAL without interlacing...

[zettai]

I'm not vastly familiar with PAL encoding but I have noticed that some PAL sources are shown as "Interlaced" in the DVD2AVI preview when actually the images are free from any interlacing.

So, which of the following is true?

a) Despite not containing interlacing the footage is still encoded in fields using mpeg2 interlacing support

b) DVD2AVI doesn't detect it's progressive so presumes it's interlaced when in fact it might be progressively encoded (?? dunno if this is possible)

The reason I am interested is that I want to know how to deal with the chroma of the output I will get in avisynth - so when doing colourspace conversions I can choose interlaced (or not) to avoid bad chroma sampling.

[RB]

Originally posted by zettai
b) DVD2AVI doesn't detect it's progressive so presumes it's interlaced when in fact it might be progressively encoded (?? dunno if this is possible)
No, DVD2AVI is spot on here. If DVD2AVI reports "Interlaced", it's encoded as such and you must use ConvertToYUY2(Interlaced=True). This has nothing to do with what your eyes see. However if to your eyes it really looks progressive, you can then reencode as progressive, you just need to upsample to YUY2 correctly depending on the original stream encoding.

[zettai]

Good. That's exactly what I thought was true, I just wanted to be absolutely certain.

Thanks!