diff --git a/public/js/main.js b/public/js/main.js
index 1766b46..27532b8 100644
--- a/public/js/main.js
+++ b/public/js/main.js
@@ -63,6 +63,7 @@ document.addEventListener('DOMContentLoaded', () => {
     let seekOffset = 0;
     let isDraggingSeek = false;
     let isStreamActive = false;
+    let pendingSeekTimeout = null;
 
     const formatBytes = (bytes) => {
         if (!bytes || bytes === 0) return '0 B';
@@ -101,6 +102,8 @@ document.addEventListener('DOMContentLoaded', () => {
             if (message.type === 'duration' && message.duration) {
                 videoDuration = message.duration;
                 if (seekTotalTime) seekTotalTime.textContent = formatTime(videoDuration);
+                showSeekBar();
+                updateSeekBarPosition(seekOffset + (videoPlayer.currentTime || 0));
             }
             if (message.type === 'progress') {
                 handleProgress(message.progress);
@@ -283,9 +286,15 @@ document.addEventListener('DOMContentLoaded', () => {
         if (!selectedKey || !selectedBucket || videoDuration <= 0) return;
         targetSeconds = Math.max(0, Math.min(targetSeconds, videoDuration - 0.5));
         seekOffset = targetSeconds;
+        isStreamActive = false;
+        updateSeekBarPosition(targetSeconds);
 
         // Show seeking indicator
         if (seekingOverlay) seekingOverlay.classList.remove('hidden');
+        if (pendingSeekTimeout) {
+            clearTimeout(pendingSeekTimeout);
+            pendingSeekTimeout = null;
+        }
 
         // Build new stream URL with ss parameter
         const codec = codecSelect?.value || 'h264';
@@ -304,11 +313,12 @@ document.addEventListener('DOMContentLoaded', () => {
             videoPlayer.play().catch(() => {});
             videoPlayer.removeEventListener('canplay', onCanPlay);
         };
-        videoPlayer.addEventListener('canplay', onCanPlay);
+        videoPlayer.addEventListener('canplay', onCanPlay, { once: true });
 
         // Timeout fallback: hide seeking overlay after 8s even if canplay doesn't fire
-        setTimeout(() => {
+        pendingSeekTimeout = setTimeout(() => {
             if (seekingOverlay) seekingOverlay.classList.add('hidden');
+            pendingSeekTimeout = null;
         }, 8000);
     };
 
@@ -591,9 +601,13 @@ document.addEventListener('DOMContentLoaded', () => {
         playerOverlay.classList.add('hidden');
         videoPlayer.classList.add('hidden');
         videoPlayer.pause();
+        videoPlayer.removeAttribute('src');
+        videoPlayer.load();
         isStreamActive = false;
         videoDuration = 0;
         seekOffset = 0;
+        if (seekCurrentTime) seekCurrentTime.textContent = formatTime(0);
+        if (seekTotalTime) seekTotalTime.textContent = formatTime(0);
         hideSeekBar();
 
         if (transcodeBtn) {
@@ -652,6 +666,7 @@ document.addEventListener('DOMContentLoaded', () => {
                 videoPlayer.classList.remove('hidden');
                 isStreamActive = true;
                 showSeekBar();
+                updateSeekBarPosition(seekOffset);
                 if (playBtn) {
                     playBtn.disabled = false;
                     playBtn.textContent = 'Play';
@@ -680,6 +695,9 @@ document.addEventListener('DOMContentLoaded', () => {
 
             handleProgress({ status: 'cancelled', percent: 0, details: 'Transcode stopped' });
             isStreamActive = false;
+            videoPlayer.pause();
+            videoPlayer.removeAttribute('src');
+            videoPlayer.load();
             hideSeekBar();
             if (transcodeBtn) {
                 transcodeBtn.disabled = false;
@@ -719,6 +737,7 @@ document.addEventListener('DOMContentLoaded', () => {
         isStreamActive = true;
         showSeekBar();
         videoPlayer.addEventListener('loadedmetadata', () => {
+            updateSeekBarPosition(seekOffset);
             if (playBtn) {
                 playBtn.disabled = false;
                 playBtn.textContent = 'Play';
diff --git a/server.js b/server.js
index d5bfba1..d1a11f7 100644
--- a/server.js
+++ b/server.js
@@ -120,6 +120,29 @@ const probeFile = (filePath) => {
     });
 };
 
+const stopActiveTranscode = (progressKey) => {
+    const activeCommand = transcodeProcesses.get(progressKey);
+    if (!activeCommand) {
+        return;
+    }
+
+    try {
+        if (typeof activeCommand.removeAllListeners === 'function') {
+            activeCommand.removeAllListeners('progress');
+            activeCommand.removeAllListeners('stderr');
+            activeCommand.removeAllListeners('end');
+            activeCommand.removeAllListeners('error');
+        }
+        if (typeof activeCommand.kill === 'function') {
+            activeCommand.kill('SIGKILL');
+        }
+    } catch (killError) {
+        console.warn(`Failed to kill transcode process for ${progressKey}:`, killError);
+    } finally {
+        transcodeProcesses.delete(progressKey);
+    }
+};
+
 const extractS3Credentials = (req) => {
     const query = req.query || {};
     const username = req.headers['x-s3-username'] || req.body?.username || query.username || query.accessKeyId || '';
@@ -145,6 +168,9 @@ wss.on('connection', (ws) => {
 
                 const currentProgress = progressMap[progressKey];
                 if (currentProgress) {
+                    if (typeof currentProgress.duration === 'number' && currentProgress.duration > 0) {
+                        ws.send(JSON.stringify({ type: 'duration', key: message.key, duration: currentProgress.duration }));
+                    }
                     ws.send(JSON.stringify({ type: 'progress', key: message.key, progress: currentProgress }));
                     if (currentProgress.status === 'finished' && currentProgress.mp4Url) {
                         ws.send(JSON.stringify({ type: 'ready', key: message.key, mp4Url: currentProgress.mp4Url }));
@@ -260,20 +286,10 @@ app.post('/api/stop-transcode', (req, res) => {
         }
 
         const progressKey = getProgressKey(key);
-        const command = transcodeProcesses.get(progressKey);
-        if (!command) {
+        if (!transcodeProcesses.has(progressKey)) {
             return res.status(404).json({ error: 'No active transcode found for this key' });
         }
-
-        try {
-            if (typeof command.kill === 'function') {
-                command.kill('SIGKILL');
-            }
-        } catch (killError) {
-            console.warn('Failed to kill transcode process:', killError);
-        }
-
-        transcodeProcesses.delete(progressKey);
+        stopActiveTranscode(progressKey);
         progressMap[progressKey] = {
             status: 'cancelled',
             percent: 0,
@@ -323,6 +339,8 @@ app.get('/api/stream', async (req, res) => {
     const s3Client = createS3Client(auth);
 
     try {
+        stopActiveTranscode(progressKey);
+
         let totalBytes = 0;
         let downloadedBytes = 0;
 
@@ -392,6 +410,10 @@ app.get('/api/stream', async (req, res) => {
         try {
             const metadata = await probeFile(tmpInputPath);
             const duration = metadata.format?.duration || 0;
+            progressMap[progressKey] = {
+                ...(progressMap[progressKey] || {}),
+                duration: parseFloat(duration) || 0
+            };
             broadcastWs(progressKey, { type: 'duration', key, duration: parseFloat(duration) });
         } catch (probeErr) {
             console.error('Probe failed:', probeErr);
@@ -425,14 +447,23 @@ app.get('/api/stream', async (req, res) => {
 
             ffmpegCommand
                 .on('progress', (progress) => {
+                    const effectiveDuration = Math.max(0, (progressMap[progressKey]?.duration || 0) - startSeconds);
+                    const timemarkSeconds = ffmpeg.timemarkToSeconds(progress.timemark || '0');
+                    const absoluteSeconds = startSeconds + (isFinite(timemarkSeconds) ? timemarkSeconds : 0);
+                    const percent = effectiveDuration > 0
+                        ? Math.min(Math.max(Math.round((absoluteSeconds / (progressMap[progressKey]?.duration || effectiveDuration)) * 100), 0), 100)
+                        : Math.min(Math.max(Math.round(progress.percent || 0), 0), 100);
                     const progressState = {
                         status: 'transcoding',
-                        percent: Math.min(Math.max(Math.round(progress.percent || 0), 0), 100),
+                        percent,
                         frame: progress.frames || null,
                         fps: progress.currentFps || null,
                         bitrate: progress.currentKbps || null,
                         timemark: progress.timemark || null,
-                        details: `Streaming transcode ${Math.min(Math.max(Math.round(progress.percent || 0), 0), 100)}%`,
+                        absoluteSeconds,
+                        duration: progressMap[progressKey]?.duration || null,
+                        startSeconds,
+                        details: `Streaming transcode ${percent}%`,
                         mp4Url: null
                     };
                     progressMap[progressKey] = progressState;
@@ -446,6 +477,8 @@ app.get('/api/stream', async (req, res) => {
                     progressMap[progressKey] = {
                         status: 'finished',
                         percent: 100,
+                        duration: progressMap[progressKey]?.duration || null,
+                        startSeconds,
                         details: 'Streaming transcode complete',
                         mp4Url: null
                     };
@@ -456,6 +489,8 @@ app.get('/api/stream', async (req, res) => {
                     const failedState = {
                         status: 'failed',
                         percent: progressMap[progressKey]?.percent || 0,
+                        duration: progressMap[progressKey]?.duration || null,
+                        startSeconds,
                         details: err.message || 'Streaming transcode failed',
                         mp4Url: null
                     };
@@ -477,6 +512,9 @@ app.get('/api/stream', async (req, res) => {
                     ffmpegCommand.kill('SIGKILL');
                 } catch (_) {}
             }
+            if (transcodeProcesses.get(progressKey) === ffmpegCommand) {
+                transcodeProcesses.delete(progressKey);
+            }
         });
 
         startStream(videoCodec);