: DDP5.1 (Dolby Digital Plus 5.1), providing surround sound.
: 1080p resolution using the x264 codec, which is a standard high-definition format. Smiley.S01E03.MULTi.1080p.NF.WEB-DL.x264.DDP5.1...
: This signifies the file includes multiple audio tracks , typically the original Spanish audio along with various dubbed languages and subtitles. About Episode 3: "Non-Lover's Strings" : DDP5
You can find more information about the show's production and cast on its official IMDb page. : DDP5.1 (Dolby Digital Plus 5.1)