Function test_vfr_scene_detection

tests/test_vfr.py:99–123

Scene detection on VFR video should produce timestamps matching known ground truth. Both PyAV (native PTS) and OpenCV (CAP_PROP_POS_MSEC) should agree on scene cuts since both expose accurate PTS-derived timestamps.

(test_vfr_video: str, backend: str)

@pytest.mark.parametrize("backend", ["pyav", "opencv"])
def test_vfr_scene_detection(test_vfr_video: str, backend: str):
    """Scene detection on VFR video should produce timestamps matching known ground truth.

    Both PyAV (native PTS) and OpenCV (CAP_PROP_POS_MSEC) should agree on scene cuts since
    both expose accurate PTS-derived timestamps.
    """
    video = open_video(test_vfr_video, backend=backend)
    sm = SceneManager()
    sm.add_detector(ContentDetector())
    sm.detect_scenes(video=video, end_time=10.0)
    scene_list = sm.get_scene_list()

    # The last scene ends at the clip boundary which may vary by backend; only check known cuts.
    assert len(scene_list) >= len(EXPECTED_SCENES_VFR), (
        f"[{backend}] Expected at least {len(EXPECTED_SCENES_VFR)} scenes, got {len(scene_list)}"
    )
    for i, ((start, end), (exp_start_tc, exp_end_tc)) in enumerate(
        zip(scene_list, EXPECTED_SCENES_VFR, strict=False)
    ):
        assert start.get_timecode() == exp_start_tc, (
            f"[{backend}] Scene {i + 1} start: expected {exp_start_tc!r}, got {start.get_timecode()!r}"
        )
        assert end.get_timecode() == exp_end_tc, (
            f"[{backend}] Scene {i + 1} end: expected {exp_end_tc!r}, got {end.get_timecode()!r}"
        )


def test_vfr_seek_pyav(test_vfr_video: str):