: Dolby Digital audio, common for surround sound support.
Narrative Guide: Season 1, Episode 1 – "Un mal día" (A Bad Day) Locked Up (TV Series 2015–2020) Vis.a.Vis.720p.S01E01.WEB-DL.x264.AC3.DUAL.mkv.mp4
: This double extension suggests a container conflict; likely an MKV (Matroska) file mistakenly renamed to MP4 . : Dolby Digital audio, common for surround sound support