diff --git a/components/vision/port/maixcam/maix_rtsp_maixcam.cpp b/components/vision/port/maixcam/maix_rtsp_maixcam.cpp
index 608d0c7f..9f823340 100644
--- a/components/vision/port/maixcam/maix_rtsp_maixcam.cpp
+++ b/components/vision/port/maixcam/maix_rtsp_maixcam.cpp
@@ -214,6 +214,9 @@ namespace maix::rtsp
                 delete param->rtsp_server;
                 param->rtsp_server = nullptr;
             }
+
+            free(_param);
+            _param = nullptr;
         }
 
         for (auto &region : this->_region_list) {
@@ -474,6 +477,11 @@ namespace maix::rtsp
             _thread = nullptr;
         }
 
+		while (param->status != RTSP_IDLE) {
+			time::sleep_ms(100);
+			log::info("wait rtsp thread exit..");
+		}
+
         if (param->ffmpeg_packer) {
             delete param->ffmpeg_packer;
             param->ffmpeg_packer = nullptr;
diff --git a/components/voice/port/maixcam/maix_audio_mmf.cpp b/components/voice/port/maixcam/maix_audio_mmf.cpp
index c44c4004..810737c3 100644
--- a/components/voice/port/maixcam/maix_audio_mmf.cpp
+++ b/components/voice/port/maixcam/maix_audio_mmf.cpp
@@ -246,7 +246,7 @@ namespace maix::audio
         int frame_byte = snd_pcm_format_width(format) / 8;
         if (buffer_size < frame_byte * channels * frame_size) {
             printf("Bad buffer size, input %ld, need %d\r\n", buffer_size, frame_byte * channels * frame_size);
-            return 0;
+            return -1;
         }
 
         if ((len = (int)snd_pcm_readi(handle, buffer, frame_size)) < 0) {