Originally posted by: reaveWould a HD video converted to to DVD resolution look better than a standard DVD of the same material? Sometimes, yes. Paticularly if the HD version is sourced from a newer transfer (e.g. the original Blade Runner DVD vs. the HDTV to DVD conversion). Also, sometimes DVD versions have horizontal detail filtered to reduce flicker on interlaced displays. In these cases, an HD downscale will look better on progressive displays (see
http://www.videophile.info/Review/FOTR/FOTR_01.htm).The move in question is a Blu Ray 720p mkv, 90 min film, but only takes two and a half gigs up. I would guess from that that I could fit it onto a standard DVD and not compress it, but then again I know sh#t about HD conversion.
What you have there is a pirate 'rip' from the original blu ray disc compressed with the x264 codec and stored in the mkv container. These rips are intended for playback on home theatre PCs, and are usually sized to fit on a DVD5 or DVD9. 2.5GB sounds a bit low, the effects of compression may be visible.