Function test_vfr_drop3_scene_detection

tests/test_vfr.py:170–190

Synthetic VFR video (drop every 3rd frame, alternating 1x/2x durations) should produce timecodes matching known ground truth with both backends.

(test_vfr_drop3_video: str, backend: str)

@pytest.mark.parametrize("backend", ["pyav", "opencv"])
def test_vfr_drop3_scene_detection(test_vfr_drop3_video: str, backend: str):
    """Synthetic VFR video (drop every 3rd frame, alternating 1x/2x durations) should produce
    timecodes matching known ground truth with both backends."""
    video = open_video(test_vfr_drop3_video, backend=backend)
    sm = SceneManager()
    sm.add_detector(ContentDetector())
    sm.detect_scenes(video=video, show_progress=False)
    scene_list = sm.get_scene_list()

    assert len(scene_list) >= len(EXPECTED_SCENES_VFR_DROP3), (
        f"[{backend}] Expected at least {len(EXPECTED_SCENES_VFR_DROP3)} scenes, got {len(scene_list)}"
    )
    for i, ((start, end), (exp_start_tc, exp_end_tc)) in enumerate(
        zip(scene_list, EXPECTED_SCENES_VFR_DROP3, 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}"
        )


@pytest.mark.parametrize("backend", ["pyav", "opencv"])