diff --git a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
index 12933fc01..902f9d5c2 100644
--- a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
+++ b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
@@ -25,11 +25,15 @@ function findCodecConfig(buffer: ArrayBuffer, start: number, end: number): Array
       view.getUint8(offset + 7),
     )
 
-    // 容器 box（fullbox 多 4 字节）
-    const containerBoxes = ["trak", "mdia", "minf", "stbl"]
+    const containerBoxes = ["moov", "trak", "mdia", "minf", "stbl"]
     if (containerBoxes.includes(type)) {
-      // fullbox: size(4) + type(4) + version(1) + flags(3) = 12 bytes header
-      const contentStart = offset + 12
+      // 动态检测 fullbox：检查 offset+8 处的 version/flags 是否为 0
+      // 如果不是 fullbox，content 从 offset+8 开始；如果是 fullbox，content 从 offset+12 开始
+      const v1 = view.getUint8(offset + 8)
+      const v2 = view.getUint8(offset + 9)
+      const v3 = view.getUint8(offset + 10)
+      const isFullBox = v1 === 0 && v2 === 0 && v3 === 0
+      const contentStart = isFullBox ? offset + 12 : offset + 8
       const result = findCodecConfig(buffer, contentStart, offset + size)
       if (result) return result
     } else if (type === "stsd") {