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edit//build_base.py

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+"""Build the cut 1080p base with dense keyframes for HyperFrames.
+
+Extracts each keep-segment at 1080p (re-encode, dense keyframes, 30ms boundary audio fades),
+concats losslessly. Output: hf/base_full.mp4
+"""
+import subprocess
+from pathlib import Path
+from cutmap import keep_segments, out_duration
+
+SRC = r"D:\PromptEngineer48\In-Progress\P11-Editor\LMSTUDIO-MTP1.mp4"
+EDIT = Path(r"D:\PromptEngineer48\In-Progress\P11-Editor\edit")
+SEG_DIR = EDIT / "clips"
+SEG_DIR.mkdir(exist_ok=True)
+
+segs = keep_segments()
+parts = []
+for i, (a, b) in enumerate(segs):
+    dur = b - a
+    out = SEG_DIR / f"seg{i:02d}.mp4"
+    # 30ms fades at boundaries to avoid pops
+    af = f"afade=t=in:st=0:d=0.03,afade=t=out:st={max(dur-0.03,0):.3f}:d=0.03"
+    cmd = [
+        "ffmpeg", "-y", "-ss", f"{a:.3f}", "-i", SRC, "-t", f"{dur:.3f}",
+        "-vf", "scale=1920:1080:flags=lanczos",
+        "-c:v", "libx264", "-crf", "18", "-preset", "medium",
+        "-g", "30", "-keyint_min", "30", "-sc_threshold", "0",
+        "-af", af, "-c:a", "aac", "-b:a", "192k",
+        "-movflags", "+faststart", str(out),
+    ]
+    subprocess.run(cmd, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+    parts.append(out)
+    print(f"  seg{i:02d}: {a:.2f}-{b:.2f} ({dur:.2f}s)")
+
+# concat
+listfile = SEG_DIR / "concat.txt"
+listfile.write_text("\n".join(f"file '{p.as_posix()}'" for p in parts))
+base = EDIT / "hf" / "base_full.mp4"
+subprocess.run(["ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", str(listfile),
+                "-c", "copy", "-movflags", "+faststart", str(base)],
+               check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+print(f"base -> {base}  (expected out duration {out_duration():.2f}s)")