Just to be clear, renewable energy credits are different than carbon offsets, and easier to guarantee because they’re often tied directly to a metered renewable energy source.
That said, there are still junk RECs on the market, like those tied to energy that was produced up to 2 decades ago that nobody got around to claiming / retiring. Or RECs tied to energy sources that may have happened regardless of the REC sale.
Honestly I don’t know, but it seems to me like extracting every single frame of a video as a lossless PNG is only really something that’s necessary if you’re trying to archive something or do frame by frame restoration. Either way, it is something that you hopefully aren’t doing every day, so why not just let it run overnight & move on?
Otherwise ask yourself if you can settle with just extracting a single clip/section, or what’s actually wrong with lossy jpeg with a low -qscale:v (high quality) - start around 5 and work down until you visually can’t see any difference