Initial commit: auto-video-cut project

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

auto_video_cut/merger.py

@@ -0,0 +1,117 @@
+"""Clips zusammenführen via ffmpeg concat."""
+
+from __future__ import annotations
+
+import subprocess
+import tempfile
+from pathlib import Path
+
+from .config import VIDEO_EXTENSIONS, IMAGE_EXTENSIONS
+
+
+def _run(cmd: list[str]) -> subprocess.CompletedProcess:
+    return subprocess.run(cmd, capture_output=True, text=True, check=False)
+
+
+def image_to_clip(
+    image_path: Path,
+    output_path: Path,
+    duration: float = 3.0,
+    width: int = 1920,
+    height: int = 1080,
+) -> Path:
+    """Standbild in Video-Clip konvertieren."""
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+    cmd = [
+        "ffmpeg", "-y",
+        "-loop", "1",
+        "-i", str(image_path),
+        "-t", str(duration),
+        "-vf", f"scale={width}:{height}:force_original_aspect_ratio=decrease,"
+               f"pad={width}:{height}:(ow-iw)/2:(oh-ih)/2",
+        "-c:v", "libx264",
+        "-pix_fmt", "yuv420p",
+        "-r", "25",
+        str(output_path),
+    ]
+    result = _run(cmd)
+    if result.returncode != 0:
+        raise RuntimeError(f"ffmpeg image-to-clip Fehler: {result.stderr}")
+    return output_path
+
+
+def normalize_clip(input_path: Path, output_path: Path) -> Path:
+    """Clip auf einheitliches Format re-encoden (für concat-Kompatibilität)."""
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+    cmd = [
+        "ffmpeg", "-y",
+        "-i", str(input_path),
+        "-c:v", "libx264",
+        "-c:a", "aac",
+        "-pix_fmt", "yuv420p",
+        "-r", "25",
+        str(output_path),
+    ]
+    result = _run(cmd)
+    if result.returncode != 0:
+        raise RuntimeError(f"ffmpeg normalize Fehler: {result.stderr}")
+    return output_path
+
+
+def merge_clips(
+    clips: list[Path],
+    output_path: Path,
+    intro: Path | None = None,
+    outro: Path | None = None,
+    normalize: bool = True,
+) -> Path:
+    """Clips zusammenführen, optional mit Intro und Outro."""
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+
+    all_clips: list[Path] = []
+    if intro:
+        all_clips.append(intro)
+    all_clips.extend(clips)
+    if outro:
+        all_clips.append(outro)
+
+    if not all_clips:
+        raise ValueError("Keine Clips zum Zusammenführen.")
+
+    if len(all_clips) == 1:
+        if normalize:
+            return normalize_clip(all_clips[0], output_path)
+        cmd = ["ffmpeg", "-y", "-i", str(all_clips[0]), "-c", "copy", str(output_path)]
+        result = _run(cmd)
+        if result.returncode != 0:
+            raise RuntimeError(f"ffmpeg copy Fehler: {result.stderr}")
+        return output_path
+
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        tmp = Path(tmp_dir)
+
+        if normalize:
+            ready_clips = [
+                normalize_clip(clip, tmp / f"norm_{i:04d}.mp4")
+                for i, clip in enumerate(all_clips)
+            ]
+        else:
+            ready_clips = all_clips
+
+        list_file = tmp / "clips.txt"
+        with open(list_file, "w", encoding="utf-8") as fh:
+            for clip in ready_clips:
+                fh.write(f"file '{clip.resolve()}'\n")
+
+        cmd = [
+            "ffmpeg", "-y",
+            "-f", "concat", "-safe", "0",
+            "-i", str(list_file),
+            "-c", "copy",
+            str(output_path),
+        ]
+        result = _run(cmd)
+        if result.returncode != 0:
+            raise RuntimeError(f"ffmpeg concat Fehler: {result.stderr}")
+
+    return output_path