diff --git a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
index a95eab845..b7862e664 100644
--- a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
+++ b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
@@ -28,8 +28,8 @@ function findCodecConfig(buffer: ArrayBuffer, start: number, end: number): Array
     // 容器 box（fullbox 多 4 字节）
     const containerBoxes = ["trak", "mdia", "minf", "stbl"]
     if (containerBoxes.includes(type)) {
-      // stbl 是 fullbox，跳过 4 字节 version/flags
-      const contentStart = offset + 8
+      // fullbox: size(4) + type(4) + version(1) + flags(3) = 12 bytes header
+      const contentStart = offset + 12
       const result = findCodecConfig(buffer, contentStart, offset + size)
       if (result) return result
     } else if (type === "stsd") {
@@ -431,7 +431,7 @@ export function useCanvasPlayer(
       ctx.textAlign = "center"
 
       // 按 "/" 分割为多行（"/" 作为手动换行符）
-      const lines = title.text.split("/")
+      const lines = title.text.split(/[/／]/)
       const lineHeight = fontSize * 1.3
       const totalHeight = lines.length * lineHeight