Thanks so much for your informative post.
Here’s the issue for me: I captured sd dv footage and edited it mostly in timelines set for DV-NTSC, sometimes adding heavy fx. Can I somehow enjoy the advantage of retroactively (as it were) editing in a 422 space, as though I had captured directly into ProRes 422?
The points are 1) to edit and apply fx in a 422 space to dv footage already edited with fx applied in a timeline with dv settings; and 2) not to re-digitize unnecessarily.
That’s why I thought I should “unrender” the clips.
This applies mainly, but not only, when I want to eventually send to compressor for encoding in DVD.
Walter