添加Watchdog

server.js

@@ -679,9 +679,26 @@ app.get('/api/hls/playlist.m3u8', async (req, res) => {
     res.setHeader('Cache-Control', 'no-cache');
     res.send(m3u8);
 });
-
 const hlsProcesses = new Map();
 
+// Watchdog: Kill HLS transcoding if the frontend stops requesting segments
+setInterval(() => {
+    const now = Date.now();
+    for (const [key, processInfo] of hlsProcesses.entries()) {
+        if (processInfo.lastActive && now - processInfo.lastActive > 30000) {
+            try {
+                if (processInfo.command) {
+                    processInfo.command.kill('SIGKILL');
+                }
+            } catch (e) {
+                console.warn(`Failed to kill inactive HLS process for ${key}:`, e);
+            }
+            hlsProcesses.delete(key);
+            console.log(`[Watchdog] Terminated inactive HLS transcode for ${key}`);
+        }
+    }
+}, 10000);
+
 app.get('/api/hls/segment.ts', async (req, res) => {
     const bucket = req.query.bucket;
     const key = req.query.key;
@@ -702,6 +719,10 @@ app.get('/api/hls/segment.ts', async (req, res) => {
     const targetSegPath = path.join(hlsDir, `segment_${seg}.ts`);
     let currentProcess = hlsProcesses.get(progressKey);
 
+    if (currentProcess) {
+        currentProcess.lastActive = Date.now();
+    }
+
     const checkIsCachedAndCompleted = () => {
         if (!fs.existsSync(targetSegPath)) return false;
         const m3u8Path = path.join(hlsDir, `temp.m3u8`);
@@ -799,7 +820,7 @@ app.get('/api/hls/segment.ts', async (req, res) => {
         });
 
         ffmpegCommand.run();
-        currentProcess = { command: ffmpegCommand, currentSeg: seg };
+        currentProcess = { command: ffmpegCommand, currentSeg: seg, lastActive: Date.now() };
         hlsProcesses.set(progressKey, currentProcess);
     }
 
@@ -807,8 +828,10 @@ app.get('/api/hls/segment.ts', async (req, res) => {
     if (!ready) {
         return res.status(500).send('Segment generation timeout');
     }
-
-    if (currentProcess) currentProcess.currentSeg = Math.max(currentProcess.currentSeg, seg);
+    if (currentProcess) {
+        currentProcess.currentSeg = Math.max(currentProcess.currentSeg, seg);
+        currentProcess.lastActive = Date.now();
+    }
 
     res.setHeader('Content-Type', 'video/MP2T');
     res.sendFile(targetSegPath);