diff --git a/.github/workflows/release-apk.yml b/.github/workflows/release-apk.yml
index 6938087..351f73a 100644
--- a/.github/workflows/release-apk.yml
+++ b/.github/workflows/release-apk.yml
@@ -56,7 +56,12 @@ jobs:
       - name: Install FFmpeg source build tools
         run: |
           sudo apt-get update
-          sudo apt-get install --yes gettext
+          sudo apt-get install --yes \
+            autoconf automake libtool pkg-config curl git \
+            build-essential yasm nasm gperf texinfo bison ragel \
+            python3 python3-pip unzip zip wget meson ninja-build \
+            doxygen cmake autogen autopoint gettext groff \
+            gtk-doc-tools libtasn1-bin
 
       - name: Build FFmpegKit from pinned sources
         run: |
@@ -67,6 +72,15 @@ jobs:
           printf 'CASTTRACE_FFMPEG_AAR_PATH=%s\n' "$aar" >> "$GITHUB_ENV"
           printf 'CASTTRACE_FFMPEG_AAR_SHA256=%s\n' "$digest" >> "$GITHUB_ENV"
 
+      - name: Upload FFmpeg source build diagnostics
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ffmpeg-source-build-diagnostics
+          path: build/ffmpeg-diagnostics/
+          if-no-files-found: ignore
+          retention-days: 14
+
       - name: Collect FFmpeg corresponding-source materials
         run: python scripts/prepare_ffmpeg_compliance.py --aar "$CASTTRACE_FFMPEG_AAR_PATH"
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 603e50b..7c64d58 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 此记录描述源码版本，不代表已发布可下载的 APK。设备验证范围见 README。
 
+## 0.2.16 - 2026-10-31
+
+- 补齐 FFmpeg 源码构建依赖并在失败时保留构建日志，修复正式 APK 发布流程。
+- 发布构建使用固定源码生成的 FFmpegKit AAR，并随包提供对应源码材料。
+
 ## 0.2.15 - 2026-10-31
 
 - 修复正式 APK 发布时 FFmpeg 源码构建脚本的行尾兼容问题。
diff --git a/RELEASING.md b/RELEASING.md
index 468419f..4ae1912 100644
--- a/RELEASING.md
+++ b/RELEASING.md
@@ -24,8 +24,11 @@ Android updates must keep the same application id and signing identity.
 ## Local release checks
 
 Use Ubuntu 24.04, JDK 17, Android SDK Platform 35, Build Tools 35.0.0, NDK
-26.2.11394342 (r26c), Python 3 and `gettext`. Download or install the pinned
-sources only through the tracked build recipe. From the repository root:
+26.2.11394342 (r26c), Python 3 and the native build packages installed by the
+release workflow (`autoconf`, `automake`, `libtool`, `autopoint`, `gettext`,
+`gperf`, `bison`, `ragel`, `yasm`, `nasm`, `meson`, `ninja-build` and the
+remaining packages in `.github/workflows/release-apk.yml`). Download or install
+the pinned sources only through the tracked build recipe. From the repository root:
 
 ```bash
 export ANDROID_HOME="$ANDROID_HOME"
@@ -52,8 +55,8 @@ byte-for-byte equivalent to the source build.
 4. Create and push the matching annotated tag, for example:
 
    ```bash
-   git tag -a v0.2.15 -m "CastTrace 0.2.15"
-   git push origin v0.2.15
+   git tag -a v0.2.16 -m "CastTrace 0.2.16"
+   git push origin v0.2.16
    ```
 
 5. Follow the `Publish Android APK` Actions run. The workflow verifies the
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 8fbf5ea..c1a1d56 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -23,8 +23,8 @@ android {
         }
         minSdk = 26
         targetSdk = 35
-        versionCode = 26
-        versionName = "0.2.15"
+        versionCode = 27
+        versionName = "0.2.16"
 
         // The pinned FFmpegKit AAR ships only these ABIs. Do not advertise
         // partial 32-bit support through unrelated AndroidX native libraries.
diff --git a/scripts/build_ffmpeg_source.sh b/scripts/build_ffmpeg_source.sh
index 5eeb037..03d1402 100755
--- a/scripts/build_ffmpeg_source.sh
+++ b/scripts/build_ffmpeg_source.sh
@@ -10,6 +10,51 @@ WORKSPACE="$(mktemp -d "$ROOT/build/ffmpeg-source-build.XXXXXX")"
 SOURCE="$WORKSPACE/ffmpegkit"
 trap 'printf "FFmpeg source build workspace: %s\n" "$WORKSPACE"' EXIT
 
+collect_diagnostics() {
+  local status=$?
+  local diagnostics="$ROOT/build/ffmpeg-diagnostics"
+  trap - EXIT
+  if (( status != 0 )); then
+    mkdir -p "$diagnostics/logs"
+    {
+      printf 'exit_status=%s\n' "$status"
+      printf 'build_commit=%s\n' "$BUILD_COMMIT"
+      printf 'workspace=%s\n' "$WORKSPACE"
+      printf 'ANDROID_SDK_ROOT='
+      printenv ANDROID_SDK_ROOT || printenv ANDROID_HOME || true
+      printf 'ANDROID_NDK_ROOT='
+      printenv ANDROID_NDK_ROOT || true
+      printf '\n=== NDK source.properties ===\n'
+      if [[ -n "$(printenv ANDROID_NDK_ROOT || true)" && -f "$(printenv ANDROID_NDK_ROOT)/source.properties" ]]; then
+        cat "$(printenv ANDROID_NDK_ROOT)/source.properties"
+      fi
+      printf '\n=== tool versions ===\n'
+      for tool in java autoconf automake libtoolize pkg-config gettext; do
+        if command -v "$tool" >/dev/null 2>&1; then
+          "$tool" --version 2>&1 | head -n 2 || true
+        else
+          printf '%s: unavailable\n' "$tool"
+        fi
+      done
+    } > "$diagnostics/environment.txt"
+
+    if [[ -d "$SOURCE" ]]; then
+      while IFS= read -r -d '' log; do
+        local relative
+        relative="$(realpath --relative-to="$SOURCE" "$log")"
+        mkdir -p "$diagnostics/logs/$(dirname "$relative")"
+        cp "$log" "$diagnostics/logs/$relative"
+        printf '\n=== %s (last 200 lines) ===\n' "$relative" >&2
+        tail -n 200 "$log" >&2 || true
+      done < <(find "$SOURCE" -type f -name build.log -print0 -o -type f -name config.log -print0)
+    fi
+    printf 'FFmpeg source build diagnostics: %s\n' "$diagnostics" >&2
+  fi
+  printf 'FFmpeg source build workspace: %s\n' "$WORKSPACE"
+  exit "$status"
+}
+trap collect_diagnostics EXIT
+
 git init -q "$SOURCE"
 git -C "$SOURCE" remote add origin https://github.com/ffmpegkit-maintained/ffmpeg.git
 git -C "$SOURCE" fetch --depth=1 origin "$BUILD_COMMIT"