diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 2d996ab..4fbb6ce 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -54,6 +54,19 @@ jobs:
             echo "$env:USERPROFILE\.local\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
           }
 
+      - name: Install ffmpeg (macOS)
+        if: matrix.platform == 'macos'
+        run: brew install ffmpeg
+
+      - name: Install ffmpeg (Linux)
+        if: matrix.platform == 'linux'
+        run: sudo apt-get update && sudo apt-get install -y ffmpeg
+
+      - name: Install ffmpeg (Windows)
+        if: matrix.platform == 'windows'
+        shell: powershell
+        run: choco install ffmpeg -y
+
       - name: Set up Python (Unix)
         if: matrix.platform != 'windows'
         run: uv python install ${{ env.PYTHON_VERSION }}