diff --git a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
index f2280c305..6e19db61d 100644
--- a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
+++ b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
@@ -42,12 +42,24 @@ function findCodecConfigRecursive(
       return buffer.slice(offset + 8, offset + size)
     }
 
-    // VisualSampleEntry (avc1/avc3/hvc1/hev1) 前 78 字节是固定字段，子 box 在 78 字节之后
-    // 普通容器 box (moov/trak/mdia/minf/stbl/stsd) 从 offset+8 开始递归
     const visualSampleEntryTypes = ["avc1", "avc3", "hvc1", "hev1"]
-    const childStart = visualSampleEntryTypes.includes(type) ? offset + 8 + 78 : offset + 8
-    const childResult = findCodecConfigRecursive(buffer, childStart, offset + size)
-    if (childResult) return childResult
+    const isVisualSampleEntry = visualSampleEntryTypes.includes(type)
+    
+    if (isVisualSampleEntry) {
+      // VisualSampleEntry: 前 78 字节是固定字段，子 box 在 78 字节之后
+      // 先尝试 offset+8+78，如果没找到再尝试 offset+8（兼容不同 MP4 结构）
+      console.log("[findCodecConfig] VisualSampleEntry:", type, "at", offset, "size", size, "trying offset+8+78")
+      const childResult1 = findCodecConfigRecursive(buffer, offset + 8 + 78, offset + size)
+      if (childResult1) return childResult1
+      
+      console.log("[findCodecConfig] VisualSampleEntry:", type, "at", offset, "trying offset+8 (fallback)")
+      const childResult2 = findCodecConfigRecursive(buffer, offset + 8, offset + size)
+      if (childResult2) return childResult2
+    } else {
+      // 普通容器 box，从 offset+8 开始递归
+      const childResult = findCodecConfigRecursive(buffer, offset + 8, offset + size)
+      if (childResult) return childResult
+    }
 
     offset += size
   }