Interlaced or progressive?

Jenya · Post by **Jenya** » Mon Aug 18, 2008 2:54 am

How can you check video game footage to see if it's interlaced or progressive?

The Origonal Head Hunter · Post by **The Origonal Head Hunter** » Mon Aug 18, 2008 4:44 am

Run it though DGIndex?

Zarxrax · Post by **Zarxrax** » Mon Aug 18, 2008 11:13 am

Or just look at it with your eyes?

Jenya · Post by **Jenya** » Mon Aug 18, 2008 2:30 pm

Run it though DGIndex?

Tried it already, didn't work

Or just look at it with your eyes?

Yeah, I did that. It's just these two things from the guide that concern me, which is why I ask in the first place. I'd rather not have to check every single frame of all my footage if there's a faster way to tell.

3) Progressive footage encoded as 'interlaced'. This is where you have footage which doesn't look like it has any interlacing at all but DGIndex has told you that every frame was encoded using Interlaced encoding. This means that the footage was encoded one field at a time even though both fields are part of the same frame. This isn't a problem, really - you can still encode and edit it progressively. This often happens with PAL encodes of movies. The only thing you need to be careful about is whether the chroma channel is sampled correctly when doing any colourspace conversions. I'll show you how below and, thankfully, it's rare for this to be necessary.

5) Switching between interlaced and progressive! If in DGIndex a source is switching between interlaced and progressive but is also being reported as completely FILM then don't worry - it's progressively encoded and Force FILM will restore the original frames. However, if it is switching and it's being reported as mostly NTSC then you have a hybrid dvd (just like the SuperGALS disc I'm using below) and this will need to be handled in a different way, as I will describe later. Hybrid sources have two forms, one is where you have mostly FILM and only some parts interlaced and the other where only some parts will be FILM. These will be discussed in more detail later. Remember that some sources that only have a very small about of interlaced footage (such as FILM 98%) can often have Force FILM used. Often but not always - so make sure you double check for interlaced frames in virtualdub when using this option. I have yet to see a hybrid PAL dvd but I suppose it could happen.

Zarxrax · Post by **Zarxrax** » Mon Aug 18, 2008 8:07 pm

I've never seen a game use interlaced movies, but then again I've not looked at clips from a whole lot of games. If it looks progressive I think you are fine.