[Marcin Grabos]

Sorry, I gave wrong advice. With magnify effect, the enlarged one will appear as additional “layer”.
So, inside Premiere, you have to make title few times bigger than your sequence dimensions, choose maximum font size to fill in horizontally, drop it to your sequence, resize down and make scaling with keyframes as you wish. If is not enough, you have to options. First is transform effect which give you another 300% zoom, or nest this title (option under right click of mouse) and then you have another 600% to the size.

[Marcin Grabos]

Use magnify effect. Just make sure that “size” is large enough.

[Marcin Grabos]

For broadcast mpeg2 you can use MXF op1a format.

[Marcin Grabos]

Very good deinterlacer you will find inside free Virtualdub [Yadif interpolation, under video->filters->deinterlace(internal)]. Save file as uncompressed (default). I would recommend to try as well resize filter in Virtualdub (has many different algorithms to choose from), so later you can compare result with work of Red Giant filter.
In what format is this old footage?

[Marcin Grabos]

I think main question is this: how do you preview final export from Premiere? Your indication, that uncompressed export from Premiere (that is: incorrect pixel aspect ratio and deinterlaced video) looks better than export in source codec dv, tells me, that you probably viewing this on LCD computer monitor via some player with deinterlacing filter on. For good start my advice is:
– follow steps in my post above
– make sure that field order is the same in video, sequence and output
– export as dv
– import your final video to proper sequence in Premiere and see how it looks there or even better – watch it on tv

[Marcin Grabos]

Export video from AE as NTSC DV or directly import to Premiere your AE composition. Loosless in this case most probably is uncompressed rgb, which doesn’t support interlace and DV pixel ratio.

[Marcin Grabos]

I guess, that you confused about handling interlace by Premiere because of bluriness in the output. Good method to avoid this, is checking box “use maximum render quality”. This will increase render time, but exported image should be sharper.

[Marcin Grabos]

For subtitling I personally use two simple tools.
First one is SubtitleEdit. It can be used with any editing software because output are png pictures with transparency. You need create txt file with subtitle lines (each line is for one png), import this txt as plain text (menu file -> import plain text), go to menu file->export-> BDN xml/png option, then choose font, size, color, outline, align and export all.
The other one is ancient software developed for Premiere Pro 2.0 and it’s still works (at least with CS 5.5 on Win 7). Is called Premiere Pro Title Creator https://www.2writers.com/Eddie/PpTitleCreator.htm) First thing is as usual – make txt file with your subs lines (save it with ANSI formating). Then, create template title in Premiere as you wish to look like (but instead of “type tool” use “area type tool), find and highligt it in the project panel, export as title with any name, open Title Creator, and do 3 steps: import your nice title-template prtl file, import your subs in txt and press create title files (output will be as many prtl files as your lines in txt with nice look of your own template). Of course these prtl’s can be further edited after importing to Premiere, but that’s not the point.

[Marcin Grabos]

You didn’t say in what format are your source clips so not really sure, but there is great tool for such purpose I discover recently (and tested). This jpeg2000 codec is free, works as plugin for Premiere, After Effects and Photoshop (Win or Mac version), has lot of customisable preferences like bith depth, “yuv”/rgb, loosles with/without alpha or compressed (size or level) and many other features (eg: compliant with Digital Cinema Initiatives format). What is important in your case, it provides great quality in much less size than uncompressed or prores, isn’t cpu “hungry”, has something called autoproxy mode (when you choose Preview as 1/2 or 1/4 it decodes only half or quarter data – and check it out how looks 1/4 mode in comparison to most of other codecs).
In manual is also something interesting about (this one I didn’t tested yet):
“JPEG 2000 images can be saved in a set of tiles. This can allow an image decoder to view select pieces of the image instead of having to decompress the entire thing. Can be especially helpful with very large images. Defaults to tile size of 1024 pixels”.
As output is set of pictures all you need is import to Premiere and work on nested (can be replaced with clip as any regular clip).

https://www.fnordware.com/j2k/