[tests] Allow for 1 frame drift between architectures

Author: Breakthrough

.github/workflows/release-test.yml

@@ -131,7 +131,7 @@ jobs:
           PYTEST=${{ matrix.os == 'windows-latest' && 'venv_bare/Scripts/pytest' || 'venv_bare/bin/pytest' }}
           python -m venv venv_bare
           $PY -m pip install pytest "$WHEEL"
-          $PYTEST -m release -k test_install_bare
+          $PYTEST tests/release/test_install_matrix.py -m release -k test_install_bare
       - name: Test OpenCV Install
         shell: bash
         run: |
@@ -140,7 +140,7 @@ jobs:
           PYTEST=${{ matrix.os == 'windows-latest' && 'venv_opencv/Scripts/pytest' || 'venv_opencv/bin/pytest' }}
           python -m venv venv_opencv
           $PY -m pip install pytest "${WHEEL}[opencv]"
-          $PYTEST -m release -k test_opencv_only
+          $PYTEST tests/release/test_install_matrix.py -m release -k test_opencv_only
       - name: Test PyAV Install
         shell: bash
         run: |
@@ -149,4 +149,4 @@ jobs:
           PYTEST=${{ matrix.os == 'windows-latest' && 'venv_pyav/Scripts/pytest' || 'venv_pyav/bin/pytest' }}
           python -m venv venv_pyav
           $PY -m pip install pytest "${WHEEL}[pyav]"
-          $PYTEST -m release -k test_pyav_only
+          $PYTEST tests/release/test_install_matrix.py -m release -k test_pyav_only

tests/release/test_golden_regression.py

@@ -78,4 +78,17 @@ def test_golden_regression(golden_file):
     scene_list = scene_manager.get_scene_list()
     actual_cuts = [scene[0].frame_num for scene in scene_list[1:]]
 
-    assert actual_cuts == expected_cuts, f"Cut list mismatch for {golden_file}"
+    # HistogramDetector and AdaptiveDetector do enough float-heavy math that
+    # CPU/SIMD/BLAS differences (e.g. Apple Accelerate vs OpenBLAS, ARM NEON
+    # vs x86 AVX) plus 1-LSB pixel differences from the decoder can shift cut
+    # frames by 1 across platforms. Allow ±1 frame for these two detectors.
+    if detector_name in ("HistogramDetector", "AdaptiveDetector"):
+        assert len(actual_cuts) == len(expected_cuts), (
+            f"Cut count mismatch for {golden_file}: actual={actual_cuts} expected={expected_cuts}"
+        )
+        for actual, expected in zip(actual_cuts, expected_cuts, strict=True):
+            assert abs(actual - expected) <= 1, (
+                f"Cut frame drift > 1 for {golden_file}: actual={actual_cuts} expected={expected_cuts}"
+            )
+    else:
+        assert actual_cuts == expected_cuts, f"Cut list mismatch for {golden_file}"