diff --git a/play.lua b/play.lua
index f7b75fe..67b3551 100644
--- a/play.lua
+++ b/play.lua
@@ -133,7 +133,7 @@ local get_task = {}
 local function readU32(s, pos)
     if pos + 3 > #s then return nil end
     local b1, b2, b3, b4 = s:byte(pos, pos + 3)
-    -- 使用 bit32.lshift 和 bit32.bor
+    -- 使用网络字节序（大端序）
     return bit32.bor(
         bit32.lshift(b1, 24),
         bit32.lshift(b2, 16),
@@ -142,27 +142,45 @@ local function readU32(s, pos)
     )
 end
 
--- 解析 FramePack 二进制数据
+-- 修复后的 FramePack 解析函数
 local function unpackFramePack(data)
     local frames = {}
     local pos = 1
 
+    -- 读取总帧数
     local frameCount = readU32(data, pos)
-    if not frameCount then error("Invalid framepack header") end
+    if not frameCount then 
+        error("Invalid framepack header - no frame count found")
+    end
+    print("Parsing " .. frameCount .. " frames")
     pos = pos + 4
 
     for i = 1, frameCount do
+        -- 读取当前帧的大小
         local size = readU32(data, pos)
-        if not size then error("Truncated framepack at frame " .. i) end
+        if not size then 
+            error("Truncated framepack at frame " .. i .. ", position " .. pos)
+        end
+        
+        print("Frame " .. i .. " size: " .. size .. " bytes")
         pos = pos + 4
-        if pos + size - 1 > #data then error("Frame " .. i .. " out of bounds") end
+        
+        -- 检查是否有足够的数据来读取这个帧
+        if pos + size - 1 > #data then 
+            error("Frame " .. i .. " size (" .. size .. ") extends beyond data boundary")
+        end
+        
+        -- 提取帧数据（这应该是完整的PNG图像数据）
         local frameData = data:sub(pos, pos + size - 1)
         frames[i] = frameData
+        
         pos = pos + size
     end
 
     return frames
 end
+
+
 -- 分批下载（每批 50 帧）
 local BATCH_SIZE = 20
 -- local totalFrames = #videoInfo.frame_urls