Complete VIDEO-001 through VIDEO-004 software video studies

tools/video004_keyframe.py

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+"""Контроль одной и двух потерь источников опорного кадра H.264."""
+
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+
+from tools.video004_transport import (
+    BASELINE_160, BASELINE_320, CODEC_RESULTS, OUTPUT, _frames, simulate,
+)
+
+
+DEFAULT_OUTPUT = OUTPUT.with_name("keyframe_recovery.json")
+
+
+def run() -> dict:
+    codec = json.loads(CODEC_RESULTS.read_text(encoding="utf-8"))
+    baseline = json.loads(BASELINE_320.read_text(encoding="utf-8"))
+    baseline_160 = json.loads(BASELINE_160.read_text(encoding="utf-8"))
+    cases = []
+    for window in baseline["windows"]:
+        combined, _ = _frames("NORMAL", 640, 360, 10, window, codec, baseline_160)
+        frames = [frame for frame in combined if frame.stream_id == 0x56303334]
+        for rate in ("2/3", "3/4"):
+            for k, r, boost in ((8, 1, False), (8, 1, True), (8, 2, False)):
+                for kind, count in (("keyframe", 1), ("keyframe_double", 2)):
+                    item = simulate(frames, 10, rate, k, r, (kind, count), boost)
+                    item["window"] = window["name"]
+                    cases.append(item)
+    return {"source_sha256": codec["source_sha256"], "cases": cases, "rf_tx": 0}
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--output", type=Path, default=DEFAULT_OUTPUT)
+    args = parser.parse_args()
+    result = run()
+    args.output.parent.mkdir(parents=True, exist_ok=True)
+    args.output.write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding="utf-8")
+    print(f"VIDEO-004: {len(result['cases'])} случаев потери опорного кадра; {args.output}")
+
+
+if __name__ == "__main__":
+    main()