All the Colors of Giallo (2019), directed by Federico Caddeo, encoded in 10 bit HEVC with AAC sound, including original Italian stereo and English subtitles.
IMDb : https://www.imdb.com/title/tt9703854/
Video encoded in two-pass 8 500 kbps x265 10bit with the veryslow preset for archive quality image.
Subtitles converted to VobSub and repositioned.
Note : This little documentary, co-produced by Severin Films, is not really groundbreaking as a documentary, it's mostly talking heads and brief film clips (some in quite worse quality than the most recent remasters of the same films), but it's a treasure trove if you want to get an idea of this quintessential Italian genre, its antecedents and successors, and the people who created it.
The interview subjects are many, including Dario Argento, Lamberto Bava (mostly talking about his father), Barbara Bouchet, Luciano Ercoli, Edwige Fenech (in an older interview), Lucio Fulci, by way of an archive audio interview, George Hilton, Umberto Lenzi, Sergio Martino, and Daria Nicolodi. If you like giallo, you'll want to check this out.
Picture quality is variable, most of the interviews look at least decent, the archive material and film clips is often not so great, but you're here for the interviews anyway. Subtitles are good translations, at least.