Update app.py

app.py

@@ -1,7 +1,62 @@
-from fastapi import FastAPI
+from fastapi import FastAPI, UploadFile, Form
+from fastapi.responses import FileResponse
+import uuid
+import os
+import subprocess
 
 app = FastAPI()
 
-@app.get("/")
-def greet_json():
-    return {"Hello": "World"}
+# Overlay 和字体资源路径（固定）
+FONT_PATH = "/app/assets/fonts/FonderLTHTCH.ttf"
+OVERLAY_PATH = "/app/assets/overlays/dust_particles-1.mp4"
+
+@app.post("/render")
+async def render_video(
+    image: UploadFile,
+    audio: UploadFile,
+    fps: int = Form(...),
+    filter_complex: str = Form(...),
+    preset: str = Form(...),
+    filename: str = Form(...),
+    video_path: str = Form(...),
+    shortest: bool = Form(True),
+):
+    # 文件处理
+    image_ext = image.filename.split(".")[-1]
+    audio_ext = audio.filename.split(".")[-1]
+    image_path = f"/tmp/{uuid.uuid4()}.{image_ext}"
+    audio_path = f"/tmp/{uuid.uuid4()}.{audio_ext}"
+    output_path = f"{video_path.rstrip('/')}/{filename}.mp4"
+
+    # 保存上传的 image 和 audio
+    with open(image_path, "wb") as f:
+        f.write(await image.read())
+    with open(audio_path, "wb") as f:
+        f.write(await audio.read())
+
+    # 构造 FFmpeg 命令
+    cmd = [
+        "ffmpeg", "-y", "-nostdin", "-hide_banner", "-loglevel", "error",
+        "-loop", "1", "-framerate", str(fps), "-i", image_path,
+        "-i", OVERLAY_PATH,
+        "-i", audio_path,
+        "-filter_complex", filter_complex,
+        "-map", "[v]", "-map", "2:a",
+        "-c:v", "libx264", "-preset", preset, "-pix_fmt", "yuv420p",
+        "-c:a", "aac", "-b:a", "192k",
+        "-movflags", "+faststart",
+        "-metadata", f"title={filename}"
+    ]
+
+    if shortest:
+        cmd.append("-shortest")
+
+    cmd.append(output_path)
+
+    # 确保目标路径存在（仅用于 Space /tmp 测试）
+    os.makedirs(os.path.dirname(output_path), exist_ok=True)
+
+    # 执行 FFmpeg
+    subprocess.run(cmd, check=True)
+
+    return FileResponse(output_path, media_type="video/mp4", filename=f"{filename}.mp4")