diff --git a/api/include/mk_events_objects.h b/api/include/mk_events_objects.h
index feb86d62..5d1127a3 100644
--- a/api/include/mk_events_objects.h
+++ b/api/include/mk_events_objects.h
@@ -122,7 +122,7 @@ API_EXPORT int API_CALL mk_media_source_broadcast_msg(const mk_media_source ctx,
 API_EXPORT const char* API_CALL mk_media_source_get_origin_url(const mk_media_source ctx);
 // MediaSource::getOriginType()
 API_EXPORT int API_CALL mk_media_source_get_origin_type(const mk_media_source ctx);
-// MediaSource::getOriginTypeStr()
+// MediaSource::getOriginTypeStr(), 使用后请用mk_free释放返回值
 API_EXPORT const char *API_CALL mk_media_source_get_origin_type_str(const mk_media_source ctx);
 // MediaSource::getCreateStamp()
 API_EXPORT uint64_t API_CALL mk_media_source_get_create_stamp(const mk_media_source ctx);
diff --git a/api/include/mk_track.h b/api/include/mk_track.h
index ee91a1e1..63d34b0f 100644
--- a/api/include/mk_track.h
+++ b/api/include/mk_track.h
@@ -74,7 +74,7 @@ API_EXPORT const char* API_CALL mk_track_codec_name(mk_track track);
 API_EXPORT int API_CALL mk_track_bit_rate(mk_track track);
 
 /**
- * 获取轨道是否准备好
+ * 获取轨道是否已就绪，1: 已就绪，0：未就绪
  */
 API_EXPORT int API_CALL mk_track_ready(mk_track track);
 
@@ -84,7 +84,7 @@ API_EXPORT int API_CALL mk_track_ready(mk_track track);
 API_EXPORT uint64_t API_CALL mk_track_frames(mk_track track);
 
 /**
- * 获取时间
+ * 获取时间，单位毫秒
  */
 API_EXPORT uint64_t API_CALL mk_track_duration(mk_track track);
 
diff --git a/api/source/mk_events_objects.cpp b/api/source/mk_events_objects.cpp
index c978fe0a..097e4201 100644
--- a/api/source/mk_events_objects.cpp
+++ b/api/source/mk_events_objects.cpp
@@ -222,8 +222,7 @@ API_EXPORT float API_CALL mk_media_source_get_track_loss(const mk_media_source c
     assert(ctx);
     MediaSource *src = (MediaSource *)ctx;
     // rtp推流只有一个统计器，但是可能有多个track，如果短时间多次获取间隔丢包率，第二次会获取为-1
-    float loss = src->getLossRate((*((Track::Ptr *)track))->getTrackType());
-    return loss;
+    return src->getLossRate((*((Track::Ptr *)track))->getTrackType());
 }
 
 API_EXPORT int API_CALL mk_media_source_broadcast_msg(const mk_media_source ctx, const char *msg, size_t len) {
diff --git a/api/source/mk_track.cpp b/api/source/mk_track.cpp
index 7f751b49..dbd94eb4 100644
--- a/api/source/mk_track.cpp
+++ b/api/source/mk_track.cpp
@@ -206,13 +206,7 @@ API_EXPORT int API_CALL mk_track_video_gop_interval_ms(mk_track track) {
     assert(track);
     auto video = dynamic_pointer_cast<VideoTrack>((*((Track::Ptr *)track)));
     if (video) {
-        int gop_size = video->getVideoGopSize();
-        int gop_interval_ms = video->getVideoGopInterval();
-        float fps = video->getVideoFps();
-        if (fps <= 1 && gop_interval_ms) {
-            fps = gop_size * 1000.0 / gop_interval_ms;
-        }
-        return gop_interval_ms;
+        return video->getVideoGopInterval();
     }
     WarnL << "not video track";
     return 0;