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video_render/ffmpeg.py

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+from __future__ import annotations
+
+import logging
+import shlex
+import subprocess
+from pathlib import Path
+from typing import Sequence
+
+logger = logging.getLogger(__name__)
+
+
+def _run_ffmpeg(args: Sequence[str]) -> None:
+    cmd = ["ffmpeg", "-hide_banner", "-loglevel", "error", *args]
+    logger.debug("Executando ffmpeg: %s", " ".join(shlex.quote(part) for part in cmd))
+    completed = subprocess.run(cmd, check=False)
+    if completed.returncode != 0:
+        raise RuntimeError(f"ffmpeg falhou com exit code {completed.returncode}")
+
+
+def extract_audio_to_wav(input_video: Path, output_wav: Path) -> Path:
+    _run_ffmpeg(
+        [
+            "-y",
+            "-i",
+            str(input_video),
+            "-ac",
+            "1",
+            "-ar",
+            "16000",
+            "-vn",
+            str(output_wav),
+        ]
+    )
+    return output_wav
+
+
+def create_video_segment(input_video: Path, start: float, end: float, output_path: Path) -> Path:
+    duration = max(0.01, end - start)
+    _run_ffmpeg(
+        [
+            "-y",
+            "-i",
+            str(input_video),
+            "-ss",
+            f"{start:.3f}",
+            "-t",
+            f"{duration:.3f}",
+            "-c",
+            "copy",
+            str(output_path),
+        ]
+    )
+    return output_path
+