Set your global preference to External . When a file fails, tap the "HW" button on the video overlay to toggle to "SW" manually. For DTS audio on the free version, accept that you must use the internal codec or buy the full app.
nPlayer does not support loading arbitrary user-provided .dll or .so files. When you toggle "External Codec" in nPlayer, you are activating the hardware decoders already baked into your phone’s chipset (Qualcomm, MediaTek, Apple Silicon). nplayer external codec
Launch nPlayer. Tap the Settings icon (usually a gear in the top right or bottom bar). Set your global preference to External
Look for a section labeled Codec , Playback , or Video . (The exact location varies slightly between the iOS and Android versions). nPlayer does not support loading arbitrary user-provided
With this guide, you are no longer at the mercy of error messages. You control the codec, the codec does not control you. Do you have a specific codec that still won't play? Convert the file using Handbrake (to H.264/AAC) before transferring it to your device.