diff --git a/com.twin.app.shoptime/src/components/VideoPlayer/MediaPlayer.v2.jsx b/com.twin.app.shoptime/src/components/VideoPlayer/MediaPlayer.v2.jsx
index 69331956..d5b6a42f 100644
--- a/com.twin.app.shoptime/src/components/VideoPlayer/MediaPlayer.v2.jsx
+++ b/com.twin.app.shoptime/src/components/VideoPlayer/MediaPlayer.v2.jsx
@@ -49,7 +49,19 @@ const memoGetDurFmt = memoize(
 
 const getDurFmt = () => {
   if (typeof window === 'undefined') return null;
-  return memoGetDurFmt();
+
+  try {
+    return memoGetDurFmt();
+  } catch (error) {
+    console.error('[MediaPlayer.v2] DurationFmt creation failed:', error);
+    // Fallback: simple formatter using secondsToTime
+    return {
+      format: (time) => {
+        if (!time || !time.millisecond) return '00:00';
+        return secondsToTime(Math.floor(time.millisecond / 1000));
+      }
+    };
+  }
 };
 
 /**
@@ -162,6 +174,33 @@ const MediaPlayerV2 = forwardRef((props, ref) => {
     }
   }, [onLoadStart]);
 
+  // proportionLoaded 플랫폼별 계산
+  const updateProportionLoaded = useCallback(() => {
+    if (!videoRef.current) return;
+
+    // webOS Media 컴포넌트: proportionLoaded 속성 사용
+    if (ActualVideoComponent === Media) {
+      const loaded = videoRef.current.proportionLoaded || 0;
+      setProportionLoaded(loaded);
+      return;
+    }
+
+    // TReactPlayer/HTMLVideoElement: buffered API 사용
+    const video = videoRef.current;
+    if (video.buffered && video.buffered.length > 0 && video.duration) {
+      try {
+        const bufferedEnd = video.buffered.end(video.buffered.length - 1);
+        const loaded = bufferedEnd / video.duration;
+        setProportionLoaded(loaded);
+      } catch (error) {
+        // buffered.end() can throw if index is out of range
+        setProportionLoaded(0);
+      }
+    } else {
+      setProportionLoaded(0);
+    }
+  }, [ActualVideoComponent]);
+
   const handleUpdate = useCallback((ev) => {
     const el = videoRef.current;
     if (!el) return;
@@ -178,7 +217,7 @@ const MediaPlayerV2 = forwardRef((props, ref) => {
     setSourceUnavailable((el.loading && sourceUnavailable) || el.error);
 
     // Proportion 계산
-    setProportionLoaded(el.proportionLoaded || 0);
+    updateProportionLoaded(); // 플랫폼별 계산 함수 호출
     setProportionPlayed(newDuration > 0 ? newCurrentTime / newDuration : 0);
 
     // 콜백 호출
@@ -194,7 +233,7 @@ const MediaPlayerV2 = forwardRef((props, ref) => {
     if (ev.type === 'durationchange' && onDurationChange) {
       onDurationChange(ev);
     }
-  }, [onTimeUpdate, onLoadedData, onLoadedMetadata, onDurationChange, sourceUnavailable]);
+  }, [onTimeUpdate, onLoadedData, onLoadedMetadata, onDurationChange, sourceUnavailable, updateProportionLoaded]);
 
   const handleEnded = useCallback((e) => {
     if (onEnded) {
@@ -256,12 +295,18 @@ const MediaPlayerV2 = forwardRef((props, ref) => {
   }, [sourceUnavailable]);
 
   const seek = useCallback((timeIndex) => {
-    if (videoRef.current && !isNaN(videoRef.current.duration)) {
-      videoRef.current.currentTime = Math.min(
-        Math.max(0, timeIndex),
-        videoRef.current.duration
-      );
+    if (!videoRef.current) return;
+
+    const video = videoRef.current;
+    const dur = video.duration;
+
+    // duration 유효성 체크 강화 (0, NaN, Infinity 모두 체크)
+    if (isNaN(dur) || dur === 0 || dur === Infinity) {
+      console.warn('[MediaPlayer.v2] seek failed: invalid duration', dur);
+      return;
     }
+
+    video.currentTime = Math.min(Math.max(0, timeIndex), dur);
   }, []);
 
   const getMediaState = useCallback(() => {
@@ -335,6 +380,20 @@ const MediaPlayerV2 = forwardRef((props, ref) => {
     prevModalRef.current = isModal;
   }, [isModal, play, showControls]);
 
+  // ========== proportionLoaded 주기적 업데이트 ==========
+  // TReactPlayer의 경우 buffered가 계속 변경되므로 주기적 체크 필요
+  useEffect(() => {
+    // 초기 한 번 실행
+    updateProportionLoaded();
+
+    // 1초마다 업데이트
+    const interval = setInterval(() => {
+      updateProportionLoaded();
+    }, 1000);
+
+    return () => clearInterval(interval);
+  }, [updateProportionLoaded]);
+
   // ========== Cleanup ==========
   useEffect(() => {
     return () => {