Re: The DVD-5
Well, the VOBs read as 16:9. DVD Lab Pro, which I used to author the disc, seems to be defaulting to Letterbox for "Widescreen Movie Display on 4:3" anyway, and I haven't changed that setting. HCenc now seems to set the sequence_display_extension by default to 540 (it shouldn't technically be set for this disc, but the majority of commercial discs seem to do the same anyway) and it seems that Restream does not want to remove it. Personally, I think the disc is fine as it is.