This request is a bit ambiguous. You’ve written:
What are External Codecs?
Issue: Video plays, but audio is still silent (DTS). nplayer external codec better
External codecs handle ASS/SSA subtitles differently. Instead of converting them to plain text (which loses styling, karaoke effects, and positioning), the external engine renders the graphics in real-time. For anime fans, this is non-negotiable. This request is a bit ambiguous