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libmpv Dependencies

This document summarizes the current dependency route for libmpv, FFmpeg, deko3d, hos-audio, and nvtegra.

Current Recommendation

Use the wiliwili prebuilt media packages for the current release path:

  1. libuam
  2. switch-ffmpeg
  3. switch-libmpv_deko3d

This is the same route used by the project Dockerfile and GitHub Actions.

Why Not Plain devkitPro Packages

Plain devkitPro packages remain useful as a fallback, but they are not the current release baseline because the project needs:

  1. Network playback through FFmpeg.
  2. hos-audio.
  3. deko3d render support.
  4. nvtegra hardware decode support when available.

Use plain packages only for minimal protocol/player debugging.

Current Project State

NX-Cast currently has:

  1. deko3d render wiring.
  2. Local player overlay and input controls.
  3. show_osd bridge.
  4. Runtime preference for hwdec=nvtegra.
  5. Process-volume handling through aud:a when available.

The parts that still depend on installed packages are:

  1. Whether mpv/render_dk3d.h exists.
  2. Whether libmpv is really a deko3d build.
  3. Whether FFmpeg exposes hwcontext_nvtegra.

Validation

Useful local checks:

test -f /opt/devkitpro/portlibs/switch/include/mpv/client.h
test -f /opt/devkitpro/portlibs/switch/include/mpv/render_dk3d.h
test -f /opt/devkitpro/portlibs/switch/lib/libmpv.a
pkg-config --static --libs mpv
strings /opt/devkitpro/portlibs/switch/lib/libmpv.a | rg "deko3d|hos|nvtegra"

Strict project build:

source /opt/devkitpro/switchvars.sh
make NXCAST_REQUIRE_LIBMPV=1 NXCAST_REQUIRE_DEKO3D=1 -j2
NXCAST_MIN_NRO_SIZE=5000000 ./scripts/package_release.sh

Full Toolchain Guide

For installation and rebuild details, see ffmpeg-mpv-toolchain.md.