diff --git a/av_transport/av_trans_engine/filters/av_transport_input/av_transport_input_filter.cpp b/av_transport/av_trans_engine/filters/av_transport_input/av_transport_input_filter.cpp
index 4eca1ea28d381a5e35b17d7c67f242e714aa78c4..ea5723e5109c55f8e4f612fa96aeae94b2153966 100644
--- a/av_transport/av_trans_engine/filters/av_transport_input/av_transport_input_filter.cpp
+++ b/av_transport/av_trans_engine/filters/av_transport_input/av_transport_input_filter.cpp
@@ -555,7 +555,7 @@ ErrorCode AVInputFilter::PushData(const std::string& inPort, const AVBufferPtr&
         return ErrorCode::ERROR_INVALID_PARAMETER_VALUE;
     }
 
-    int32_t bufSize = buffer->GetMemory()->GetSize();
+    size_t bufSize = buffer->GetMemory()->GetSize();
     auto tempBuffer = std::make_shared<AVBuffer>(Plugin::BufferMetaType::VIDEO);
     tempBuffer->pts = buffer->pts;
     tempBuffer->flag = buffer->flag;