De-interlaced and progressive in same sequence

[Javiera_Y_]

I'm having trouble searching for this info online so I decided to ask  a few questions openly and I'm really hoping I can get an answer!

So I received (quite a terrible) material from someone else and I'm editing it, along with new material I recorded my self on a DSLR at 29,97fps (progressive), the old clips from this other person are interlaced also at 29,97. The questions begin now:

1.-Should I set the sequence progressive?
2.-Should I de-interlace with Premiere the old clips?
3.-Does "always de-interlace" have any effect on progressive clips?
4.-Basically, what should I do to end up with the best looking results and least amount of time rendering or waiting for my computer to respond?
5.-"is it fixed" if I see no horizontal lines in my workspace while editing?

Just by looking at the clips on the Workspace I can't see any of the lines but I know I'll be mixing both i and p (and when opening the files on quicktime, mpeg stream clip ofr vlc they were very prominent) I preferred to ask this question since renders are taking a lot of time (about 4 minutes per 1.30 mins clip) and I'm obviously having trouble working without rendering some of the interlaced clips playing on my sequence. I really don't want to find out once I export that some of those horizontal lines are still visible in the clips (this is going to be played on progressive monitors and youtube mostly)

Hope I made myself clear in here and I'm looking forward into getting a few answers or at least moral support, I've been looking in the forums for about an hour and this questions still remain unanswered in my mind, but if it's been properly answered before I would appreciate for you to just copy the link and avoid any rude comments since this is already getting on my nerves and I know we've all been there.

[Trevor_Asq]

In 25P sequence 50i material is deinterlaced by doubling field 1 by default

Heres my notes on that:

25P v 50i FIELD INTERPOLATION

50i in 25p timeline - default ‘field sample’ will double first field. No easy alternative de-interlacing.

‘Field merge’ seems to merge two fields (no stepping fields) BUT = 50i on export

50i, conformed to 25P in 25P timeline - with frame sampling selected will merge fields

50i, conformed to 25P in 50i timeline - seems to merge two fields (no stepping fields) BUT = 50i on export

[Javiera_Y_]

Thanks, there were some things I had no idea about working with interlaced material that you just stated, but I'm afraid I'm still in the same situation. The new material is in 29,97p and the old in 29,97 also, but interlaced, so does any of the options you said would work the same way?

This is one of my first jobs after finishing college and as usual is not something I was taught in those five years. Also, exporting interlaced is a no-go.

is there anything you would do in this situation?

[Trevor_Asq · Accepted solution]

https://forums.adobe.com/people/Javiera+Y.  wrote

Thanks, there were some things I had no idea about working with interlaced material that you just stated, but I'm afraid I'm still in the same situation. The new material is in 29,97p and the old in 29,97 also, but interlaced, so does any of the options you said would work the same way?

This is one of my first jobs after finishing college and as usual is not something I was taught in those five years. Also, exporting interlaced is a no-go.

is there anything you would do in this situation?

Yes for 50i read 59.98i and for 25P read 29.97P.

Basically

1. Yes make your sequence progressive

2. That's it - your interlaced material will be deinterlaced when you export from the progressive timeline, if you choose a progressive destination.  This will be field doubled (first field of each frame is repeated.

BUT If you want to 'merge' fields then you select them in project BEFORE editing into timeline and MODIFY | INTERPRET FOOTAGE - to conform them to 'no fields'

Neither of those is perfect - but you'd need a decent deinterlace plug-in to improve on them.

I haven't tested all this in a while - so test yourself and ensure you are happy with the result.