Function test_vfr_csv_backend_conformance

tests/test_vfr.py:409–426

PyAV and OpenCV should produce identical scene timecodes for VFR video. Only the known interior scenes are compared; the last scene's end time may vary slightly between backends since it reflects the clip boundary rather than a detected cut.

(test_vfr_video: str)

def test_vfr_csv_backend_conformance(test_vfr_video: str):
    """PyAV and OpenCV should produce identical scene timecodes for VFR video.

    Only the known interior scenes are compared; the last scene's end time may vary slightly
    between backends since it reflects the clip boundary rather than a detected cut.
    """
    timecodes: dict[str, list[tuple[str, str]]] = {}
    for backend in ("pyav", "opencv"):
        video = open_video(test_vfr_video, backend=backend)
        sm = SceneManager()
        sm.add_detector(ContentDetector())
        sm.detect_scenes(video=video, end_time=10.0)
        timecodes[backend] = [(s.get_timecode(), e.get_timecode()) for s, e in sm.get_scene_list()]
    # Compare only the known scenes (last scene's end varies by backend at the clip boundary).
    n = len(EXPECTED_SCENES_VFR)
    assert timecodes["pyav"][:n] == timecodes["opencv"][:n], (
        f"Backend timecode mismatch:\n  pyav:   {timecodes['pyav']}\n  opencv: {timecodes['opencv']}"
    )