[build] Use isolated venv for smoke tests

Author: Breakthrough

.github/workflows/build.yml

@@ -82,20 +82,28 @@ jobs:
           echo "scenedetect_version=`python -c \"import scenedetect; print(scenedetect.__version__.replace('-', '.'))\"`" >> "$GITHUB_ENV"
 
       - name: Smoke Test Package (Source Dist)
+        shell: bash
         run: |
-          python -m pip install dist/scenedetect-${{ env.scenedetect_version }}.tar.gz
+          python -m venv .smoke-sdist
+          VENV_BIN=.smoke-sdist/bin
+          [ -d .smoke-sdist/Scripts ] && VENV_BIN=.smoke-sdist/Scripts
+          source "$VENV_BIN/activate"
+          pip install "dist/scenedetect-${{ env.scenedetect_version }}.tar.gz[pyav]" --only-binary av
           scenedetect version
           scenedetect -i tests/resources/testvideo.mp4 -b opencv time --end 2s
           scenedetect -i tests/resources/testvideo.mp4 -b pyav time --end 2s
-          python -m pip uninstall -y scenedetect
 
       - name: Smoke Test Package (Wheel)
+        shell: bash
         run: |
-          python -m pip install dist/scenedetect-${{ env.scenedetect_version }}-py3-none-any.whl
+          python -m venv .smoke-wheel
+          VENV_BIN=.smoke-wheel/bin
+          [ -d .smoke-wheel/Scripts ] && VENV_BIN=.smoke-wheel/Scripts
+          source "$VENV_BIN/activate"
+          pip install "dist/scenedetect-${{ env.scenedetect_version }}-py3-none-any.whl[pyav]" --only-binary av
           scenedetect version
           scenedetect -i tests/resources/testvideo.mp4 -b opencv time --end 2s
           scenedetect -i tests/resources/testvideo.mp4 -b pyav time --end 2s
-          python -m pip uninstall -y scenedetect
 
       - name: Build Package (Headless)
         shell: bash
@@ -105,15 +113,19 @@ jobs:
           git checkout pyproject.toml
 
       - name: Smoke Test Package (Headless Wheel)
+        shell: bash
         run: |
-          python -m pip install dist/scenedetect_headless-${{ env.scenedetect_version }}-py3-none-any.whl
+          python -m venv .smoke-headless
+          VENV_BIN=.smoke-headless/bin
+          [ -d .smoke-headless/Scripts ] && VENV_BIN=.smoke-headless/Scripts
+          source "$VENV_BIN/activate"
+          pip install "dist/scenedetect_headless-${{ env.scenedetect_version }}-py3-none-any.whl[pyav]" --only-binary av
           # Confirm the install pulled `opencv-python-headless`, not the GUI variant.
           # If both are present, cv2 imports may silently come from either.
           python -c "import importlib.metadata as m; ds = sorted(d.metadata['Name'] for d in m.distributions() if d.metadata['Name'] in ('opencv-python', 'opencv-python-headless')); assert ds == ['opencv-python-headless'], f'Expected only opencv-python-headless, got: {ds}'"
           scenedetect version
           scenedetect -i tests/resources/testvideo.mp4 -b opencv time --end 2s
           scenedetect -i tests/resources/testvideo.mp4 -b pyav time --end 2s
-          python -m pip uninstall -y scenedetect-headless
 
       - name: Upload Package
         if: ${{ matrix.python-version == '3.13' && matrix.os == 'ubuntu-latest' }}