Inital Commit

modules/render_engine.py

@@ -0,0 +1,66 @@
+import subprocess
+from pathlib import Path
+from modules.config import DEBUG
+
+def render_montage_clip(
+    title_card_path: Path,
+    montage_path: Path,
+    output_path: Path,
+    intro_path: Path,
+    outro_path: Path,
+    music_path: Path,
+    is_vertical: bool = False,
+):
+    """
+    Combines intro (with title), montage, and outro into a final video.
+    Uses ffmpeg for concatenation and audio overlay.
+    """
+
+    if not title_card_path.exists():
+        raise FileNotFoundError(f"[ERROR] Title card not found: {title_card_path}")
+    if not montage_path.exists():
+        raise FileNotFoundError(f"[ERROR] Montage clip not found: {montage_path}")
+    if not intro_path.exists():
+        raise FileNotFoundError(f"[ERROR] Intro file not found: {intro_path}")
+    if not outro_path.exists():
+        raise FileNotFoundError(f"[ERROR] Outro file not found: {outro_path}")
+    if not music_path.exists():
+        raise FileNotFoundError(f"[ERROR] Music track not found: {music_path}")
+
+    filter_complex = (
+        "[0:v:0]fps=30,setsar=1[v0];"
+        "[1:v:0]fps=30,setsar=1[v1];"
+        "[1:a:0]anull[a1];"
+        "[3:v:0]fps=30,setsar=1[v3];"
+        "[v0][v1][v3]concat=n=3:v=1:a=0[outv];"
+        "[a1][2:a:0]amix=inputs=2:duration=first[outa]"
+    )
+
+    ffmpeg_cmd = [
+        "ffmpeg",
+        "-y",
+        "-i", str(title_card_path),   # 0 = intro with title baked in
+        "-i", str(montage_path),      # 1 = montage content
+        "-i", str(music_path),        # 2 = background music
+        "-i", str(outro_path),        # 3 = static outro
+        "-filter_complex", filter_complex,
+        "-map", "[outv]",
+        "-map", "[outa]",
+        "-c:v", "libx264",
+        "-preset", "ultrafast",
+        "-crf", "23",
+        "-c:a", "aac",
+        "-b:a", "192k",
+        str(output_path)
+    ]
+
+    if DEBUG:
+        print(f"[DEBUG] Starting render_montage_clip")
+        print(f"[DEBUG] Input files:")
+        print(f"  title_card_path:   {title_card_path} → {title_card_path.exists()}")
+        print(f"  montage_path:      {montage_path} → {montage_path.exists()}")
+        print(f"  output_path:       {output_path}")
+        print(f"  output_dir exists? {output_path.parent.exists()}")
+        print(f"[DEBUG] subprocess command: {ffmpeg_cmd}")
+
+    subprocess.run(ffmpeg_cmd, check=True)