ci: add ffmpeg install

.github/workflows/ci.yml

@@ -30,6 +30,14 @@ jobs:
     - name: Install Qt
       uses: jurplel/install-qt-action@v3
 
+    - name: Install FFmpeg
+      shell: bash
+      run: |
+        FILENAME="ffmpeg-n4.4-latest-win32-gpl-shared-4.4"
+        wget -c https://github.com/sudo-nautilus/FFmpeg-Builds-Win32/releases/download/latest/$FILENAME.zip
+        7z x $FILENAME.zip
+        $FILENAME >> $GITHUB_PATH
+
     - name: Build
       shell: bash
       run: |