diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cc1ee5e..ff4e4e0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,8 +12,8 @@ jobs:
   windows:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
         with:
           dotnet-version: 10.0.x
       - name: Restore
@@ -36,7 +36,7 @@ jobs:
         run: dotnet publish MusicDrop3/MFlacDrop.csproj -c Release -r win-x64 --self-contained true --no-restore -o artifacts/gui
       - name: Publish CLI
         run: dotnet publish MusicDrop3.Cli/MusicDrop3.Cli.csproj -c Release -r win-x64 --self-contained true --no-restore -o artifacts/cli
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: MusicDrop-community-win-x64-slim
           path: |
diff --git a/.github/workflows/portable.yml b/.github/workflows/portable.yml
index 486cc1f..56b3f1c 100644
--- a/.github/workflows/portable.yml
+++ b/.github/workflows/portable.yml
@@ -16,8 +16,8 @@ jobs:
         os: [windows-latest, macos-15]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
         with:
           dotnet-version: 10.0.x
       - run: dotnet restore MusicDrop.Portable.slnx --configfile NuGet.Config
diff --git a/.github/workflows/release-macos.yml b/.github/workflows/release-macos.yml
index d6279f5..8217abe 100644
--- a/.github/workflows/release-macos.yml
+++ b/.github/workflows/release-macos.yml
@@ -4,6 +4,11 @@ on:
   push:
     tags: ['v*']
   workflow_dispatch:
+    inputs:
+      version:
+        description: Package version used for a non-release validation run
+        required: true
+        default: v3.1.0-preview.1-ci
 
 permissions:
   contents: write
@@ -19,16 +24,20 @@ jobs:
           - runner: macos-15
             rid: osx-arm64
     runs-on: ${{ matrix.runner }}
+    env:
+      PACKAGE_VERSION: ${{ github.event_name == 'push' && github.ref_name || inputs.version }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
         with:
-          dotnet-version: 10.0.x
+          dotnet-version: 10.0.301
       - name: Build pinned LGPL FFmpeg
         run: bash tools/build_ffmpeg_macos.sh "$RUNNER_TEMP/musicdrop-ffmpeg"
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
       - name: Build and package app
-        run: bash tools/package_macos.sh "${{ matrix.rid }}" "$RUNNER_TEMP/musicdrop-ffmpeg" "$RUNNER_TEMP/dist"
-      - uses: actions/upload-artifact@v4
+        run: bash tools/package_macos.sh "${{ matrix.rid }}" "$RUNNER_TEMP/musicdrop-ffmpeg" "$RUNNER_TEMP/dist" "$PACKAGE_VERSION"
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: MusicDrop-${{ matrix.rid }}
           path: |
@@ -41,12 +50,12 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           pattern: MusicDrop-osx-*
           path: release
           merge-multiple: true
-      - uses: softprops/action-gh-release@v2
+      - uses: softprops/action-gh-release@3d0d9888cb7fd7b750713d6e236d1fcb99157228 # v3.0.2
         with:
           files: |
             release/MusicDrop-*.zip
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7ea6887..c5ddc3e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -3,34 +3,50 @@ name: release
 on:
   push:
     tags: ['v*']
+  workflow_dispatch:
+    inputs:
+      version:
+        description: Package version used for a non-release validation run
+        required: true
+        default: v3.1.0-preview.1-ci
 
 permissions:
   contents: write
 
 jobs:
-  release:
+  build:
     runs-on: windows-latest
+    env:
+      PACKAGE_VERSION: ${{ github.event_name == 'push' && github.ref_name || inputs.version }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
         with:
-          dotnet-version: 10.0.x
+          dotnet-version: 10.0.301
       - run: dotnet restore MusicDrop.slnx --configfile NuGet.Config
-      - run: dotnet publish MusicDrop3/MFlacDrop.csproj -c Release -r win-x64 --self-contained true --no-restore -o publish/gui
-      - run: dotnet publish MusicDrop3.Cli/MusicDrop3.Cli.csproj -c Release -r win-x64 --self-contained true --no-restore -o publish/cli
-      - name: Assemble slim archive
+      - name: Build verified Full and Slim packages
         shell: pwsh
-        run: |
-          New-Item -ItemType Directory -Path package | Out-Null
-          Copy-Item publish/gui/MusicDrop3.exe package/
-          Copy-Item publish/cli/MusicDrop3.Cli.exe package/
-          Copy-Item README.md,LICENSE,THIRD-PARTY-NOTICES.md,TRADEMARKS.md,PRIVACY.md package/
-          Compress-Archive -Path package/* -DestinationPath MusicDrop-${{ github.ref_name }}-Slim-Windows-x64.zip
-          (Get-FileHash MusicDrop-${{ github.ref_name }}-Slim-Windows-x64.zip -Algorithm SHA256).Hash.ToLowerInvariant() |
-            Set-Content MusicDrop-${{ github.ref_name }}-Slim-Windows-x64.zip.sha256.txt -Encoding ascii
-      - uses: softprops/action-gh-release@v2
+        run: ./tools/package_windows.ps1 -Version $env:PACKAGE_VERSION -OutputDirectory release
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: MusicDrop-Windows-x64
+          path: |
+            release/MusicDrop-*.zip
+            release/MusicDrop-*.sha256.txt
+          if-no-files-found: error
+
+  release:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          name: MusicDrop-Windows-x64
+          path: release
+      - uses: softprops/action-gh-release@3d0d9888cb7fd7b750713d6e236d1fcb99157228 # v3.0.2
         with:
           files: |
-            MusicDrop-*.zip
-            MusicDrop-*.sha256.txt
+            release/MusicDrop-*.zip
+            release/MusicDrop-*.sha256.txt
           generate_release_notes: true
diff --git a/THIRD-PARTY-NOTICES.md b/THIRD-PARTY-NOTICES.md
index 193c5ad..a67afb9 100644
--- a/THIRD-PARTY-NOTICES.md
+++ b/THIRD-PARTY-NOTICES.md
@@ -37,7 +37,7 @@ Upstream: <https://ffmpeg.org/> · build scripts: <https://github.com/BtbN/FFmpe
 
 Binary packages that bundle FFmpeg include its `LICENSE.txt`. Users may replace the separate FFmpeg folder with a compatible build, subject to that build's license.
 
-macOS packages build the same FFmpeg commit from the pinned source archive instead of using BtbN Windows binaries. The macOS configuration disables GPL and nonfree, statically enables LAME (LGPL), libogg and libvorbis (BSD-style licenses), records the build configuration and includes the corresponding license files. See `docs/FFMPEG.md` and `tools/build_ffmpeg_macos.sh`.
+macOS packages build the same FFmpeg commit from the pinned source archive instead of using BtbN Windows binaries. The macOS configuration disables GPL and nonfree, statically enables LAME and mpg123 (LGPL), plus libogg and libvorbis (BSD-style licenses), records the build configuration and includes the corresponding license files. See `docs/FFMPEG.md` and `tools/build_ffmpeg_macos.sh`.
 
 ## Optional qqmusic_decrypt compatibility component
 
diff --git a/docs/FFMPEG.md b/docs/FFMPEG.md
index 1927c35..de41f31 100644
--- a/docs/FFMPEG.md
+++ b/docs/FFMPEG.md
@@ -19,11 +19,13 @@ The macOS release workflow does not copy an opaque third-party binary. It downlo
 
 The script:
 
-- disables GPL, nonfree, network access, documentation and FFplay;
-- enables static LAME and Vorbis dependencies with compatible licenses;
+- disables GPL, nonfree, network access, documentation, FFplay and automatic external-library detection;
+- enables static LAME, mpg123 and Vorbis dependencies with compatible licenses;
 - rejects unexpected Homebrew dylib references;
 - verifies FLAC, PCM, MP3 and Vorbis encoders;
 - records `-version`, `-buildconf` and SHA-256 outputs;
-- copies FFmpeg, LAME, libogg and libvorbis license texts into the app bundle.
+- copies FFmpeg, LAME, mpg123, libogg and libvorbis license texts into the app bundle.
+
+Homebrew bottles do not consistently install their `COPYING` files. The repository therefore carries the complete license texts extracted from the formula-pinned LAME 4.0, libogg 1.3.6 and libvorbis 1.3.7 source archives after verifying SHA-256 `3df512…16eb`, `83e670…4638` and `b33cc4…954b`; packaging never silently omits them.
 
 See `tools/build_ffmpeg_macos.sh` and [macOS packaging](MACOS.md). A source-built LGPL configuration does not replace the need to comply with LGPL source/relinking obligations when distributing binaries.
diff --git a/docs/MACOS.md b/docs/MACOS.md
index c13e103..196dba7 100644
--- a/docs/MACOS.md
+++ b/docs/MACOS.md
@@ -41,7 +41,7 @@ On a matching Mac:
 
 ```bash
 ./tools/build_ffmpeg_macos.sh "$TMPDIR/musicdrop-ffmpeg"
-./tools/package_macos.sh osx-arm64 "$TMPDIR/musicdrop-ffmpeg" "$PWD/dist"
+./tools/package_macos.sh osx-arm64 "$TMPDIR/musicdrop-ffmpeg" "$PWD/dist" v3.1.0-preview.1
 ```
 
 ## Signing and notarization boundary
diff --git a/third_party/licenses/LAME-COPYING.txt b/third_party/licenses/LAME-COPYING.txt
new file mode 100644
index 0000000..8e6fa60
--- /dev/null
+++ b/third_party/licenses/LAME-COPYING.txt
@@ -0,0 +1,491 @@
+		  GNU LIBRARY GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1991 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+[This is the first released version of the library GPL.  It is
+ numbered 2 because it goes with version 2 of the ordinary GPL.]
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+Licenses are intended to guarantee your freedom to share and change
+free software--to make sure the software is free for all its users.
+
+  This license, the Library General Public License, applies to some
+specially designated Free Software Foundation software, and to any
+other libraries whose authors decide to use it.  You can use it for
+your libraries, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if
+you distribute copies of the library, or if you modify it.
+
+  For example, if you distribute copies of the library, whether gratis
+or for a fee, you must give the recipients all the rights that we gave
+you.  You must make sure that they, too, receive or can get the source
+code.  If you link a program with the library, you must provide
+complete object files to the recipients so that they can relink them
+with the library, after making changes to the library and recompiling
+it.  And you must show them these terms so they know their rights.
+
+  Our method of protecting your rights has two steps: (1) copyright
+the library, and (2) offer you this license which gives you legal
+permission to copy, distribute and/or modify the library.
+
+  Also, for each distributor's protection, we want to make certain
+that everyone understands that there is no warranty for this free
+library.  If the library is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original
+version, so that any problems introduced by others will not reflect on
+the original authors' reputations.
+
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that companies distributing free
+software will individually obtain patent licenses, thus in effect
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+we have made it clear that any patent must be licensed for everyone's
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+  Most GNU software, including some libraries, is covered by the ordinary
+GNU General Public License, which was designed for utility programs.  This
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+designated libraries.  This license is quite different from the ordinary
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+
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+  Note that it is possible for a library to be covered by the ordinary
+General Public License rather than by this special one.
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+
+		  GNU LIBRARY GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+
+  8. You may not copy, modify, sublicense, link with, or distribute
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+  11. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
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+If any portion of this section is held invalid or unenforceable under any
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+This section is intended to make thoroughly clear what is believed to
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+
+  12. If the distribution and/or use of the Library is restricted in
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+
+  13. The Free Software Foundation may publish revised and/or new
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+Such new versions will be similar in spirit to the present version,
+but may differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Library
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+the Free Software Foundation.  If the Library does not specify a
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+
+
+  14. If you wish to incorporate parts of the Library into other free
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+			    NO WARRANTY
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+  15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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+  16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
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+RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
+FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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+DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+
+           How to Apply These Terms to Your New Libraries
+
+  If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change.  You can do so by permitting
+redistribution under these terms (or, alternatively, under the terms of the
+ordinary General Public License).
+
+  To apply these terms, attach the following notices to the library.  It is
+safest to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the library's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the
+  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
+
+That's all there is to it!
diff --git a/third_party/licenses/LIBOGG-COPYING.txt b/third_party/licenses/LIBOGG-COPYING.txt
new file mode 100644
index 0000000..6111c6c
--- /dev/null
+++ b/third_party/licenses/LIBOGG-COPYING.txt
@@ -0,0 +1,28 @@
+Copyright (c) 2002, Xiph.org Foundation
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+- Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+- Neither the name of the Xiph.org Foundation nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/third_party/licenses/LIBVORBIS-COPYING.txt b/third_party/licenses/LIBVORBIS-COPYING.txt
new file mode 100644
index 0000000..fb456a8
--- /dev/null
+++ b/third_party/licenses/LIBVORBIS-COPYING.txt
@@ -0,0 +1,28 @@
+Copyright (c) 2002-2020 Xiph.org Foundation
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+- Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+- Neither the name of the Xiph.org Foundation nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/tools/build_ffmpeg_macos.sh b/tools/build_ffmpeg_macos.sh
index a1ca482..b89e0d8 100644
--- a/tools/build_ffmpeg_macos.sh
+++ b/tools/build_ffmpeg_macos.sh
@@ -2,9 +2,14 @@
 set -euo pipefail
 
 output_dir="${1:?usage: build_ffmpeg_macos.sh <output-directory>}"
+repo_root="$(cd "$(dirname "$0")/.." && pwd)"
 source_commit="9b6c8969e0"
 source_sha256="7e779215eae16ad7e93ddad59bd82822bd3d34e4dc61f9996f9481b2c0605bc3"
 source_url="https://github.com/FFmpeg/FFmpeg/archive/${source_commit}.tar.gz"
+lame_license_source_url="https://downloads.sourceforge.net/project/lame/lame/4.0/lame-4.0.tar.gz"
+lame_license_source_sha256="3df5124d5ad3a98312ffd7ba6a9b36230e4f8a3e66d3ce0f425e336c32d216eb"
+ogg_license_source_sha256="83e6704730683d004d20e21b8f7f55dcb3383cdf84c0daedf30bde175f774638"
+vorbis_license_source_sha256="b33cc4934322bcbf6efcbacf49e3ca01aadbea4114ec9589d1b1e9d20f72954b"
 work_dir="$(mktemp -d "${TMPDIR:-/tmp}/musicdrop-ffmpeg.XXXXXX")"
 trap 'rm -rf "$work_dir"' EXIT
 
@@ -13,23 +18,60 @@ output_dir="$(cd "$output_dir" && pwd)"
 archive="$work_dir/ffmpeg.tar.gz"
 
 brew install pkg-config nasm lame libogg libvorbis
-curl --fail --location --retry 3 --output "$archive" "$source_url"
+curl_args=(
+  --fail
+  --location
+  --retry 10
+  --retry-all-errors
+  --retry-delay 5
+  --retry-max-time 900
+  --connect-timeout 30
+  --max-time 900
+  --user-agent "MusicDrop-release-builder"
+  --output "$archive"
+)
+if [[ -n "${GITHUB_TOKEN:-}" ]]; then
+  curl_args+=(--header "Authorization: Bearer ${GITHUB_TOKEN}")
+fi
+curl "${curl_args[@]}" "$source_url"
 printf '%s  %s\n' "$source_sha256" "$archive" | shasum -a 256 --check
 tar -xzf "$archive" -C "$work_dir"
 source_dir="$(find "$work_dir" -mindepth 1 -maxdepth 1 -type d -name 'FFmpeg-*' -print -quit)"
 test -n "$source_dir"
 
 lame_prefix="$(brew --prefix lame)"
+mpg123_prefix="$(brew --prefix mpg123)"
 ogg_prefix="$(brew --prefix libogg)"
 vorbis_prefix="$(brew --prefix libvorbis)"
+
+# Homebrew installs both static archives and dylibs. FFmpeg's pkg-config checks
+# emit -l flags, which otherwise let Apple's linker select Homebrew dylibs.
+# Put only the required archives in the first search path and explicitly use
+# Apple's per-directory search order. This preserves FFmpeg's native
+# pkg-config probes while producing standalone binaries.
+static_lib_dir="$work_dir/static-libs"
+mkdir -p "$static_lib_dir"
+static_archives=(
+  "$lame_prefix/lib/libmp3lame.a"
+  "$mpg123_prefix/lib/libmpg123.a"
+  "$ogg_prefix/lib/libogg.a"
+  "$vorbis_prefix/lib/libvorbis.a"
+  "$vorbis_prefix/lib/libvorbisenc.a"
+)
+for static_archive in "${static_archives[@]}"; do
+  test -f "$static_archive"
+  ln -s "$static_archive" "$static_lib_dir/$(basename "$static_archive")"
+done
+
 cd "$source_dir"
-PKG_CONFIG_PATH="$lame_prefix/lib/pkgconfig:$ogg_prefix/lib/pkgconfig:$vorbis_prefix/lib/pkgconfig" \
-./configure \
+if ! PKG_CONFIG_PATH="$lame_prefix/lib/pkgconfig:$ogg_prefix/lib/pkgconfig:$vorbis_prefix/lib/pkgconfig" \
+  ./configure \
   --prefix="$output_dir" \
   --disable-debug \
   --disable-doc \
   --disable-ffplay \
   --disable-network \
+  --disable-autodetect \
   --disable-shared \
   --enable-static \
   --disable-gpl \
@@ -40,7 +82,12 @@ PKG_CONFIG_PATH="$lame_prefix/lib/pkgconfig:$ogg_prefix/lib/pkgconfig:$vorbis_pr
   --enable-libvorbis \
   --pkg-config-flags="--static" \
   --extra-cflags="-I$lame_prefix/include -I$ogg_prefix/include -I$vorbis_prefix/include" \
-  --extra-ldflags="-L$lame_prefix/lib -L$ogg_prefix/lib -L$vorbis_prefix/lib"
+  --extra-ldflags="-Wl,-search_paths_first -L$static_lib_dir" \
+  --extra-libs="-lmpg123"; then
+  echo "FFmpeg configure failed; showing the diagnostic log tail." >&2
+  tail -n 250 ffbuild/config.log >&2 || true
+  exit 1
+fi
 
 make -j"$(sysctl -n hw.ncpu)"
 make install
@@ -53,14 +100,29 @@ make install
 "$output_dir/bin/ffmpeg" -hide_banner -encoders | grep -Eq '[[:space:]]flac[[:space:]]'
 "$output_dir/bin/ffmpeg" -hide_banner -encoders | grep -Eq 'pcm_s(16|24|32)le'
 
-if otool -L "$output_dir/bin/ffmpeg" "$output_dir/bin/ffprobe" | grep -Eq '/(opt/homebrew|usr/local/opt)/'; then
+dependencies_file="$output_dir/FFMPEG-DEPENDENCIES.txt"
+otool -L "$output_dir/bin/ffmpeg" "$output_dir/bin/ffprobe" | tee "$dependencies_file"
+if grep -Eq '/(opt/homebrew|usr/local/opt)/' "$dependencies_file"; then
   echo "FFmpeg unexpectedly links to Homebrew dylibs; refusing a non-portable package." >&2
   exit 1
 fi
 
+musicdrop_revision="${GITHUB_SHA:-main}"
+cat > "$output_dir/FFMPEG-SOURCE.txt" <<SOURCE_PROVENANCE
+FFmpeg commit: ${source_commit}
+Source archive: ${source_url}
+Source archive SHA-256: ${source_sha256}
+Build script: https://github.com/TonyNa-code/MusicDrop/blob/${musicdrop_revision}/tools/build_ffmpeg_macos.sh
+Dependency formulas: $(brew list --versions lame mpg123 libogg libvorbis | tr '\n' ';')
+LAME license source: ${lame_license_source_url}
+LAME license source SHA-256: ${lame_license_source_sha256}
+libogg 1.3.6 source SHA-256: ${ogg_license_source_sha256}
+libvorbis 1.3.7 source SHA-256: ${vorbis_license_source_sha256}
+Configuration and runtime dependencies are recorded beside this file.
+SOURCE_PROVENANCE
+
 mkdir -p "$output_dir/licenses"
 cp COPYING.LGPLv2.1 COPYING.LGPLv3 "$output_dir/licenses/"
-cp "$lame_prefix/share/doc/lame/COPYING" "$output_dir/licenses/LAME-COPYING.txt"
-cp "$ogg_prefix/share/doc/libogg/COPYING" "$output_dir/licenses/LIBOGG-COPYING.txt"
-cp "$vorbis_prefix/share/doc/libvorbis/COPYING" "$output_dir/licenses/LIBVORBIS-COPYING.txt"
+cp "$repo_root/third_party/licenses/"*.txt "$output_dir/licenses/"
+cp COPYING.LGPLv2.1 "$output_dir/licenses/MPG123-COPYING.LGPLv2.1.txt"
 shasum -a 256 "$output_dir/bin/ffmpeg" "$output_dir/bin/ffprobe" > "$output_dir/SHA256SUMS.txt"
diff --git a/tools/package_macos.sh b/tools/package_macos.sh
index c963041..8979e89 100644
--- a/tools/package_macos.sh
+++ b/tools/package_macos.sh
@@ -1,17 +1,22 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-rid="${1:?usage: package_macos.sh <osx-arm64|osx-x64> <ffmpeg-prefix> <dist-directory>}"
+rid="${1:?usage: package_macos.sh <osx-arm64|osx-x64> <ffmpeg-prefix> <dist-directory> <version>}"
 ffmpeg_prefix="${2:?missing FFmpeg prefix}"
 dist_dir="${3:?missing distribution directory}"
+version="${4:?missing package version}"
 case "$rid" in osx-arm64|osx-x64) ;; *) echo "Unsupported RID: $rid" >&2; exit 2 ;; esac
+if [[ ! "$version" =~ ^v[0-9A-Za-z.-]+$ ]]; then
+  echo "Unsupported version: $version" >&2
+  exit 2
+fi
 
 repo_root="$(cd "$(dirname "$0")/.." && pwd)"
 mkdir -p "$dist_dir"
 dist_dir="$(cd "$dist_dir" && pwd)"
 publish_root="$dist_dir/publish-$rid"
 app="$dist_dir/MusicDrop.app"
-archive="$dist_dir/MusicDrop-3.1.0-preview.1-${rid}.zip"
+archive="$dist_dir/MusicDrop-${version}-${rid}.zip"
 
 dotnet publish "$repo_root/MusicDrop.Desktop/MusicDrop.Desktop.csproj" \
   -c Release -r "$rid" --self-contained true -o "$publish_root/desktop"
@@ -26,12 +31,23 @@ cp "$publish_root/cli/musicdrop" "$app/Contents/Resources/musicdrop-cli"
 cp "$ffmpeg_prefix/bin/ffmpeg" "$ffmpeg_prefix/bin/ffprobe" "$app/Contents/Resources/ffmpeg/bin/"
 cp -R "$ffmpeg_prefix/licenses/." "$app/Contents/Resources/ffmpeg/licenses/"
 cp "$ffmpeg_prefix/FFMPEG-VERSION.txt" "$ffmpeg_prefix/FFMPEG-BUILDCONF.txt" \
+  "$ffmpeg_prefix/FFMPEG-DEPENDENCIES.txt" "$ffmpeg_prefix/FFMPEG-SOURCE.txt" \
   "$ffmpeg_prefix/SHA256SUMS.txt" "$app/Contents/Resources/ffmpeg/"
 cp "$repo_root/tools/macos/Info.plist" "$app/Contents/Info.plist"
 cp "$repo_root/README.md" "$repo_root/README.zh-CN.md" "$repo_root/LICENSE" \
-  "$repo_root/THIRD-PARTY-NOTICES.md" "$repo_root/PRIVACY.md" \
+  "$repo_root/THIRD-PARTY-NOTICES.md" "$repo_root/TRADEMARKS.md" "$repo_root/PRIVACY.md" \
   "$app/Contents/SharedSupport/"
 
+dotnet_root="${DOTNET_ROOT:-}"
+if [[ -z "$dotnet_root" || ! -f "$dotnet_root/LICENSE.txt" ]]; then
+  dotnet_root="$(cd "$(dirname "$(command -v dotnet)")" && pwd)"
+fi
+test -f "$dotnet_root/LICENSE.txt"
+test -f "$dotnet_root/ThirdPartyNotices.txt"
+cp "$dotnet_root/LICENSE.txt" "$app/Contents/SharedSupport/DOTNET-LICENSE.txt"
+cp "$dotnet_root/ThirdPartyNotices.txt" \
+  "$app/Contents/SharedSupport/DOTNET-THIRD-PARTY-NOTICES.txt"
+
 iconset="$publish_root/MusicDrop.iconset"
 mkdir -p "$iconset"
 source_icon="$repo_root/MusicDrop3/Assets/musicdrop-logo-1024.png"
diff --git a/tools/package_windows.ps1 b/tools/package_windows.ps1
new file mode 100644
index 0000000..20dc13d
--- /dev/null
+++ b/tools/package_windows.ps1
@@ -0,0 +1,183 @@
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory)]
+    [ValidatePattern('^v[0-9A-Za-z.-]+$')]
+    [string]$Version,
+
+    [string]$OutputDirectory = 'artifacts/release-windows',
+
+    [string]$FfmpegArchive = ''
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = 'Stop'
+
+$repoRoot = [IO.Path]::GetFullPath((Join-Path $PSScriptRoot '..'))
+$distRoot = if ([IO.Path]::IsPathFullyQualified($OutputDirectory)) {
+    [IO.Path]::GetFullPath($OutputDirectory)
+} else {
+    [IO.Path]::GetFullPath((Join-Path $repoRoot $OutputDirectory))
+}
+[IO.Directory]::CreateDirectory($distRoot) | Out-Null
+
+$workRoot = Join-Path ([IO.Path]::GetTempPath()) ('MusicDropWindowsRelease-' + [guid]::NewGuid().ToString('N'))
+[IO.Directory]::CreateDirectory($workRoot) | Out-Null
+$createdOutputs = [Collections.Generic.List[string]]::new()
+
+$archiveName = 'ffmpeg-n8.1.2-34-g9b6c8969e0-win64-lgpl-shared-8.1.zip'
+$archiveRoot = 'ffmpeg-n8.1.2-34-g9b6c8969e0-win64-lgpl-shared-8.1'
+$archiveUrl = 'https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-08-11-13-11/' + $archiveName
+$archiveSha256 = '026f3ba22f0acf4fe58bf4da28a7eb64ffb107b270119684b91e4cace3b577aa'
+$ffmpegRevision = 'n8.1.2-34-g9b6c8969e0-20260811'
+$ffmpegFiles = [ordered]@{
+    'bin/ffmpeg.exe' = '86a84607db881c93ac23ec8216b454e05ca8ae035ee8209fc2a9b10a845c2c84'
+    'bin/ffprobe.exe' = '8e174683e435b089d7a9942afec5019e30ae6c550fcabfca3f917beb0768f7a6'
+    'bin/avcodec-62.dll' = 'cc91ca4fc909f3d5a512e5b0d50a3d161305e005ca7febe969b5737acaef2475'
+    'bin/avdevice-62.dll' = '2a229adf099eb360aad5bdda24a7f3d1a9d151db0e28365b6f428277360c320f'
+    'bin/avfilter-11.dll' = 'e0d301cf78679caf8337a0babde8879924227a892e2e08abe04e9ec88bb9c351'
+    'bin/avformat-62.dll' = '2fbd044d2a910035032d83dfd81d0f7fe442b73bea56341ccc171c941c62eb91'
+    'bin/avutil-60.dll' = 'fd951227b0d1b574ed964d44ccca59422be1a821b67820600a4ac0a1b558e95a'
+    'bin/swresample-6.dll' = '81d46648a06852f7123bc05501ec8c12bc396ad6f35b9ef2130ff9e3cadf80e5'
+    'bin/swscale-9.dll' = '6f1214e30b4ebcef4468ff05954413c36ec83e4c8a0ed3dc7c6a04d42c26b0bd'
+    'LICENSE.txt' = 'da7eabb7bafdf7d3ae5e9f223aa5bdc1eece45ac569dc21b3b037520b4464768'
+}
+
+function Assert-Sha256([string]$Path, [string]$Expected) {
+    if (-not (Test-Path -LiteralPath $Path -PathType Leaf)) { throw "Missing release input: $Path" }
+    $actual = (Get-FileHash -LiteralPath $Path -Algorithm SHA256).Hash.ToLowerInvariant()
+    if ($actual -ne $Expected) { throw "SHA-256 mismatch: $Path" }
+}
+
+function Copy-ReleaseDocuments([string]$Destination) {
+    foreach ($name in @('README.md', 'README.zh-CN.md', 'LICENSE', 'THIRD-PARTY-NOTICES.md',
+            'TRADEMARKS.md', 'PRIVACY.md', 'SECURITY.md')) {
+        Copy-Item -LiteralPath (Join-Path $repoRoot $name) -Destination $Destination
+    }
+
+    $dotnetRoot = Split-Path -Parent (Get-Command dotnet -ErrorAction Stop).Source
+    Copy-Item -LiteralPath (Join-Path $dotnetRoot 'LICENSE.txt') `
+        -Destination (Join-Path $Destination 'DOTNET-LICENSE.txt')
+    Copy-Item -LiteralPath (Join-Path $dotnetRoot 'ThirdPartyNotices.txt') `
+        -Destination (Join-Path $Destination 'DOTNET-THIRD-PARTY-NOTICES.txt')
+}
+
+function Write-RecursiveSums([string]$Directory) {
+    $lines = foreach ($file in Get-ChildItem -LiteralPath $Directory -Recurse -File |
+            Where-Object Name -ne 'SHA256SUMS.txt' | Sort-Object FullName) {
+        $relative = $file.FullName.Substring($Directory.TrimEnd('\').Length + 1).Replace('\', '/')
+        $hash = (Get-FileHash -LiteralPath $file.FullName -Algorithm SHA256).Hash.ToLowerInvariant()
+        "$hash  $relative"
+    }
+    $lines | Set-Content -LiteralPath (Join-Path $Directory 'SHA256SUMS.txt') -Encoding ascii
+}
+
+function Write-ZipHash([string]$ZipPath) {
+    $hashPath = $ZipPath + '.sha256.txt'
+    $hash = (Get-FileHash -LiteralPath $ZipPath -Algorithm SHA256).Hash.ToLowerInvariant()
+    "$hash  $([IO.Path]::GetFileName($ZipPath))" | Set-Content -LiteralPath $hashPath -Encoding ascii
+    $createdOutputs.Add($hashPath)
+}
+
+try {
+    $archive = if ([string]::IsNullOrWhiteSpace($FfmpegArchive)) {
+        $download = Join-Path $workRoot $archiveName
+        Invoke-WebRequest -Uri $archiveUrl -OutFile $download
+        $download
+    } else {
+        [IO.Path]::GetFullPath($FfmpegArchive)
+    }
+    $archiveInfo = Get-Item -LiteralPath $archive
+    if ($archiveInfo.Length -le 0 -or $archiveInfo.Length -gt 128MB) {
+        throw 'FFmpeg archive size is outside the allowed range.'
+    }
+    Assert-Sha256 $archive $archiveSha256
+
+    $expanded = Join-Path $workRoot 'ffmpeg-expanded'
+    Expand-Archive -LiteralPath $archive -DestinationPath $expanded
+    $ffmpegRoot = Join-Path $expanded $archiveRoot
+    foreach ($entry in $ffmpegFiles.GetEnumerator()) {
+        Assert-Sha256 (Join-Path $ffmpegRoot $entry.Key.Replace('/', '\')) $entry.Value
+    }
+
+    $ffmpegExe = Join-Path $ffmpegRoot 'bin\ffmpeg.exe'
+    $versionOutput = (& $ffmpegExe -hide_banner -version 2>&1 | Out-String)
+    if ($LASTEXITCODE -ne 0 -or -not $versionOutput.Contains($ffmpegRevision) -or
+        -not $versionOutput.Contains('--enable-version3') -or
+        -not $versionOutput.Contains('--enable-shared') -or
+        -not $versionOutput.Contains('--enable-libmp3lame') -or
+        -not $versionOutput.Contains('--enable-libvorbis') -or
+        $versionOutput.Contains('--enable-gpl')) {
+        throw 'FFmpeg version or LGPL capability verification failed.'
+    }
+    $encoders = (& $ffmpegExe -hide_banner -encoders 2>&1 | Out-String)
+    if ($LASTEXITCODE -ne 0 -or -not $encoders.Contains('libmp3lame') -or
+        -not $encoders.Contains('libvorbis') -or -not $encoders.Contains(' flac ')) {
+        throw 'FFmpeg is missing a required audio encoder.'
+    }
+
+    $publishGui = Join-Path $workRoot 'publish-gui'
+    $publishCli = Join-Path $workRoot 'publish-cli'
+    & dotnet publish (Join-Path $repoRoot 'MusicDrop3\MFlacDrop.csproj') `
+        -c Release -r win-x64 --self-contained true --no-restore -o $publishGui
+    if ($LASTEXITCODE -ne 0) { throw 'GUI publish failed.' }
+    & dotnet publish (Join-Path $repoRoot 'MusicDrop3.Cli\MusicDrop3.Cli.csproj') `
+        -c Release -r win-x64 --self-contained true --no-restore -o $publishCli
+    if ($LASTEXITCODE -ne 0) { throw 'CLI publish failed.' }
+
+    $slimRoot = Join-Path $workRoot 'package-slim'
+    $fullRoot = Join-Path $workRoot 'package-full'
+    [IO.Directory]::CreateDirectory($slimRoot) | Out-Null
+    [IO.Directory]::CreateDirectory($fullRoot) | Out-Null
+    Copy-Item -LiteralPath (Join-Path $publishGui 'MusicDrop3.exe') -Destination $slimRoot
+    Copy-Item -LiteralPath (Join-Path $publishCli 'MusicDrop3.Cli.exe') -Destination $slimRoot
+    Copy-ReleaseDocuments $slimRoot
+    Get-ChildItem -LiteralPath $slimRoot -Force | Copy-Item -Destination $fullRoot -Recurse
+
+    $ffmpegTarget = Join-Path $fullRoot 'ffmpeg'
+    foreach ($entry in $ffmpegFiles.GetEnumerator()) {
+        $destination = Join-Path $ffmpegTarget $entry.Key.Replace('/', '\')
+        [IO.Directory]::CreateDirectory([IO.Path]::GetDirectoryName($destination)) | Out-Null
+        Copy-Item -LiteralPath (Join-Path $ffmpegRoot $entry.Key.Replace('/', '\')) -Destination $destination
+    }
+    @(
+        'MusicDrop bundled FFmpeg provenance',
+        '',
+        "Build: $ffmpegRevision",
+        "Archive: $archiveName",
+        "Archive SHA-256: $archiveSha256",
+        'Build project: https://github.com/BtbN/FFmpeg-Builds',
+        'FFmpeg project: https://ffmpeg.org/',
+        'Source revision: https://github.com/FFmpeg/FFmpeg/commit/9b6c8969e0'
+    ) | Set-Content -LiteralPath (Join-Path $ffmpegTarget 'FFMPEG-SOURCE.txt') -Encoding utf8
+
+    Write-RecursiveSums $slimRoot
+    Write-RecursiveSums $fullRoot
+
+    $slimZip = Join-Path $distRoot "MusicDrop-$Version-Slim-Windows-x64.zip"
+    $fullZip = Join-Path $distRoot "MusicDrop-$Version-Full-Windows-x64.zip"
+    foreach ($path in @($slimZip, $fullZip, $slimZip + '.sha256.txt', $fullZip + '.sha256.txt')) {
+        if (Test-Path -LiteralPath $path) { throw "Refusing to overwrite release output: $path" }
+    }
+    Compress-Archive -Path (Join-Path $slimRoot '*') -DestinationPath $slimZip -CompressionLevel Optimal
+    $createdOutputs.Add($slimZip)
+    Compress-Archive -Path (Join-Path $fullRoot '*') -DestinationPath $fullZip -CompressionLevel Optimal
+    $createdOutputs.Add($fullZip)
+    Write-ZipHash $slimZip
+    Write-ZipHash $fullZip
+
+    Get-Item -LiteralPath $slimZip, $fullZip | Select-Object FullName, Length
+}
+catch {
+    foreach ($path in $createdOutputs) {
+        try { if (Test-Path -LiteralPath $path) { Remove-Item -LiteralPath $path -Force } } catch { }
+    }
+    throw
+}
+finally {
+    $tempRoot = [IO.Path]::GetFullPath([IO.Path]::GetTempPath()).TrimEnd('\') + '\'
+    $resolvedWork = [IO.Path]::GetFullPath($workRoot)
+    if ($resolvedWork.StartsWith($tempRoot, [StringComparison]::OrdinalIgnoreCase) -and
+        (Test-Path -LiteralPath $resolvedWork)) {
+        Remove-Item -LiteralPath $resolvedWork -Recurse -Force
+    }
+}