diff --git a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
index 79d8a8267..15be694c2 100644
--- a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
+++ b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
@@ -492,11 +492,6 @@ export function useCanvasPlayer(
         decoderReady = true
         // 标记缓冲结束，让 UI 开始渲染
         setState((s) => ({ ...s, isBuffering: false }))
-
-        // 更新视频尺寸（用于 aspect ratio）
-        if (meta.videoWidth > 0 && meta.videoHeight > 0) {
-          videoDimRef.current = { width: meta.videoWidth, height: meta.videoHeight }
-        }
       } catch (err) {
         console.error("[useCanvasPlayer] Decoder configure failed for segment:", err)
         return
@@ -875,12 +870,7 @@ export function useCanvasPlayer(
 
       segmentMetaRef.current = metas
 
-      // 3. 设置视频尺寸（用第一个片段的尺寸）
-      if (metas[0].videoWidth > 0 && metas[0].videoHeight > 0) {
-        videoDimRef.current = { width: metas[0].videoWidth, height: metas[0].videoHeight }
-      }
-
-      // 4. 按需解码：初始只解码前 3 个片段，后续通过 decodeAroundPosition 动态加载
+      // 3. 按需解码：初始只解码前 3 个片段，后续通过 decodeAroundPosition 动态加载
       //    避免一次性全量解码导致 frameQueue 环形缓冲区旧帧被丢弃引发黑屏
       decodedSegmentsRef.current.clear()
       const initGen = decodeGenerationRef.current