Complete VIDEO-001 through VIDEO-004 software video studies

tests/test_video004_pipeline.py

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+"""Полный доступный путь символы → CRC → стирания → видеокадр."""
+
+from __future__ import annotations
+
+import hashlib
+import json
+
+import numpy as np
+import pytest
+
+pytest.importorskip("numba")
+
+from tools.video004_pipeline_benchmark import MANIFEST, SIGNAL, decode
+
+
+def test_four_frames_exact_after_four_packet_erasures() -> None:
+    manifest = json.loads(MANIFEST.read_text(encoding="utf-8"))
+    received = np.load(SIGNAL, allow_pickle=False)
+    assert hashlib.sha256(received.tobytes()).hexdigest() == manifest["signal_sha256"]
+    result = decode(received, "numba")
+    assert result["packet_sha256"] == manifest["expected_packet_sha256"]
+    assert result["frame_sha256"] == manifest["expected_frame_sha256"]
+    assert result["parity_recoveries"] == 4
+    assert result["unrecoverable_blocks"] == 0