Initial commit: LiveStream Platform

Backend: FastAPI + SQLAlchemy + SQLite
Frontend: React + Vite + Ant Design (serif Anthropic theme)
Media server: MediaMTX with edge node support
Load balancing: round-robin / weighted / least-conn
Multicast detection with automatic fallback
Transcoding support via FFmpeg (configurable quality)
hls.js player with line & quality switching
Admin panel with password auth
Windows compatible scripts

backend/services/transcoder.py

@@ -0,0 +1,63 @@
+import asyncio
+import subprocess
+import os
+from config import settings
+
+
+class TranscodeManager:
+    _processes: dict[str, list[subprocess.Popen]] = {}
+
+    def start_transcode(self, stream_key: str, input_url: str):
+        if stream_key in self._processes:
+            return
+
+        procs = []
+        for quality in settings.qualities:
+            label = quality["label"]
+            width = quality["width"]
+            height = quality["height"]
+            bitrate = quality["bitrate"]
+            hls_dir = f"/tmp/hls/{stream_key}/{label}"
+            os.makedirs(hls_dir, exist_ok=True)
+            cmd = [
+                "ffmpeg", "-y",
+                "-i", input_url,
+                "-c:v", "libx264", "-preset", "ultrafast",
+                "-b:v", bitrate,
+                "-s", f"{width}x{height}",
+                "-c:a", "aac", "-b:a", "128k",
+                "-f", "hls",
+                "-hls_time", "4",
+                "-hls_list_size", "6",
+                "-hls_flags", "delete_segments",
+                "-hls_segment_filename", f"{hls_dir}/segment_%03d.ts",
+                f"{hls_dir}/index.m3u8",
+            ]
+            try:
+                proc = subprocess.Popen(
+                    cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL
+                )
+                procs.append(proc)
+            except FileNotFoundError:
+                pass
+
+        self._processes[stream_key] = procs
+
+    def stop_transcode(self, stream_key: str):
+        procs = self._processes.pop(stream_key, [])
+        for proc in procs:
+            try:
+                proc.terminate()
+                proc.wait(timeout=5)
+            except Exception:
+                try:
+                    proc.kill()
+                except Exception:
+                    pass
+
+    def stop_all(self):
+        for key in list(self._processes.keys()):
+            self.stop_transcode(key)
+
+
+transcode_mgr = TranscodeManager()