build-shared-ffmpeg.patch

From 2a0c1c883a1cf1cba00a15942977baa766a4b576 Mon Sep 17 00:00:00 2001
From: zhongfly <11155705+zhongfly@users.noreply.github.com>
Date: Wed, 4 Feb 2026 22:06:00 +0800
Subject: [PATCH] build(ffmpeg): always build shared FFmpeg and bundle DLLs for
 mpv

- Build FFmpeg with --enable-shared/--disable-static

- Remove leftover libav*.a to prevent accidental static linking

- Copy FFmpeg DLLs into mpv-package for runtime
---
 cmake/copy_ffmpeg_dlls.cmake | 45 ++++++++++++++++++++++++++++++++++++
 packages/ffmpeg.cmake        | 11 +++++++++
 packages/mpv.cmake           | 10 ++++++++
 3 files changed, 66 insertions(+)
 create mode 100644 cmake/copy_ffmpeg_dlls.cmake

diff --git a/cmake/copy_ffmpeg_dlls.cmake b/cmake/copy_ffmpeg_dlls.cmake
new file mode 100644
index 0000000..3e1edf3
--- /dev/null
+++ b/cmake/copy_ffmpeg_dlls.cmake
@@ -0,0 +1,45 @@
+if(NOT DEFINED FFMPEG_BIN_DIR OR "${FFMPEG_BIN_DIR}" STREQUAL "")
+    message(FATAL_ERROR "FFMPEG_BIN_DIR is required.")
+endif()
+if(NOT DEFINED DEST_DIR OR "${DEST_DIR}" STREQUAL "")
+    message(FATAL_ERROR "DEST_DIR is required.")
+endif()
+
+set(_ffmpeg_dll_patterns
+    "${FFMPEG_BIN_DIR}/avcodec-*.dll"
+    "${FFMPEG_BIN_DIR}/avdevice-*.dll"
+    "${FFMPEG_BIN_DIR}/avfilter-*.dll"
+    "${FFMPEG_BIN_DIR}/avformat-*.dll"
+    "${FFMPEG_BIN_DIR}/avutil-*.dll"
+    "${FFMPEG_BIN_DIR}/postproc-*.dll"
+    "${FFMPEG_BIN_DIR}/swresample-*.dll"
+    "${FFMPEG_BIN_DIR}/swscale-*.dll"
+    "${FFMPEG_BIN_DIR}/libavcodec-*.dll"
+    "${FFMPEG_BIN_DIR}/libavdevice-*.dll"
+    "${FFMPEG_BIN_DIR}/libavfilter-*.dll"
+    "${FFMPEG_BIN_DIR}/libavformat-*.dll"
+    "${FFMPEG_BIN_DIR}/libavutil-*.dll"
+    "${FFMPEG_BIN_DIR}/libpostproc-*.dll"
+    "${FFMPEG_BIN_DIR}/libswresample-*.dll"
+    "${FFMPEG_BIN_DIR}/libswscale-*.dll"
+)
+
+set(_ffmpeg_dlls "")
+foreach(_pattern IN LISTS _ffmpeg_dll_patterns)
+    file(GLOB _matched LIST_DIRECTORIES false "${_pattern}")
+    list(APPEND _ffmpeg_dlls ${_matched})
+endforeach()
+list(REMOVE_DUPLICATES _ffmpeg_dlls)
+
+if(NOT _ffmpeg_dlls)
+    message(FATAL_ERROR "No FFmpeg DLLs found in: ${FFMPEG_BIN_DIR}")
+endif()
+
+file(MAKE_DIRECTORY "${DEST_DIR}")
+foreach(_dll IN LISTS _ffmpeg_dlls)
+    file(COPY "${_dll}" DESTINATION "${DEST_DIR}")
+endforeach()
+
+list(LENGTH _ffmpeg_dlls _ffmpeg_dlls_count)
+message(STATUS "Copied ${_ffmpeg_dlls_count} FFmpeg DLL(s) to: ${DEST_DIR}")
+
diff --git a/packages/ffmpeg.cmake b/packages/ffmpeg.cmake
index 252c687..07e7214 100644
--- a/packages/ffmpeg.cmake
+++ b/packages/ffmpeg.cmake
@@ -56,6 +56,8 @@ ExternalProject_Add(ffmpeg
         --prefix=${MINGW_INSTALL_PREFIX}
         --arch=${TARGET_CPU}
         --target-os=mingw32
+        --enable-shared
+        --disable-static
         --pkg-config-flags=--static
         --enable-cross-compile
         --enable-runtime-cpudetect
@@ -119,6 +121,15 @@ ExternalProject_Add(ffmpeg
         "--extra-libs='${ffmpeg_extra_libs}'" # -lstdc++ / -lc++ needs by libjxl and shaderc
     BUILD_COMMAND ${MAKE}
     INSTALL_COMMAND ${MAKE} install
+        COMMAND ${EXEC} rm -f
+            ${MINGW_INSTALL_PREFIX}/lib/libavcodec.a
+            ${MINGW_INSTALL_PREFIX}/lib/libavdevice.a
+            ${MINGW_INSTALL_PREFIX}/lib/libavfilter.a
+            ${MINGW_INSTALL_PREFIX}/lib/libavformat.a
+            ${MINGW_INSTALL_PREFIX}/lib/libavutil.a
+            ${MINGW_INSTALL_PREFIX}/lib/libpostproc.a
+            ${MINGW_INSTALL_PREFIX}/lib/libswresample.a
+            ${MINGW_INSTALL_PREFIX}/lib/libswscale.a
     LOG_DOWNLOAD 1 LOG_UPDATE 1 LOG_CONFIGURE 1 LOG_BUILD 1 LOG_INSTALL 1
 )
 
diff --git a/packages/mpv.cmake b/packages/mpv.cmake
index 66613e2..3774674 100644
--- a/packages/mpv.cmake
+++ b/packages/mpv.cmake
@@ -83,6 +83,16 @@ ExternalProject_Add_Step(mpv copy-binary
     COMMENT "Copying mpv binaries and manual"
 )
 
+ExternalProject_Add_Step(mpv copy-ffmpeg-dlls
+    DEPENDEES strip-binary
+    DEPENDERS copy-binary
+    COMMAND ${CMAKE_COMMAND}
+        "-DFFMPEG_BIN_DIR=${MINGW_INSTALL_PREFIX}/bin"
+        "-DDEST_DIR=${CMAKE_CURRENT_BINARY_DIR}/mpv-package"
+        -P ${PROJECT_SOURCE_DIR}/cmake/copy_ffmpeg_dlls.cmake
+    COMMENT "Copying FFmpeg DLLs"
+)
+
 set(RENAME ${CMAKE_CURRENT_BINARY_DIR}/mpv-prefix/src/rename.sh)
 file(WRITE ${RENAME}
 "#!/bin/bash
-- 
2.52.0.windows.1