Tips on improving Star Trek (PAL) DVDs (deinterlace, framerate conversion, upscaling etc.)

Hello Avisynth experts.
As probably many of you know, 2016 is the 50th anniversary of Star Trek. I have decided to watch the COMPLETE Star Trek “anthology” in chronological order.

The good thing : Enterprise, TOS, TNG and all 12 movies are available in wonderful 1080p 24fps.
The bad thing : TAS, DS9 and VOY are available only on DVDs (just like the Director cuts of some of the movies).

I was thinking what can I do with the DVDs to simply said make them look better, in other words so that I don’t experience a big shock when I switch from a 1080p TNG episode to a 576i DS9 episode.

For those of you who don’t know how the Star Trek shows were shot - the live action scenes were shot on 35mm film at 24fps, some model work was shot on film at 24fps, other model work was done at 30fps video, the CGI effects were shot also on 30fps and each episode was “finalized” on NTSC video tape (30fps). Then these tapes were converted to 25fps interlaced PAL video, which was released on DVD.

Things I was thinking about were deinterlacing, maybe restoring the original framerate and maybe even upscaling it to at least 720p, if it will be worth it. Plus they’re encoded as relatively low bitrate mpg2, so maybe it will necessary to somehow minimize some compression artifacts.

What would you recommend? What’s the best deinterlacer? People seem to like QTGMC but that produces a 50fps file, I’d prefer a 24fps file 😃 Do you think it’s worth to upscale it? If so, which upscaling method would you recommend?

Thanks for any tips

I doubt there’s anything that you can do that would make them look appreciably better. They’re a notorious mess. The NTSC DVDs are a bit better, so get them if you’ll take any improvement. Otherwise, just watch the PAL DVDs and let your TV do any deinterlacing and upscaling that is needed. Working on them is a waste of time.