diff --git a/ijkmedia/ijkplayer/ff_ffplay_debug.h b/ijkmedia/ijkplayer/ff_ffplay_debug.h
index f1b8364df4e1bbbef4f35ddac156222e1a5b4bba..a42bd8f395944011b5361e9459a19b115350ee6d 100644
--- a/ijkmedia/ijkplayer/ff_ffplay_debug.h
+++ b/ijkmedia/ijkplayer/ff_ffplay_debug.h
@@ -34,4 +34,6 @@
 // #define FFP_NOTIFY_BUF_TIME
 // #define FFP_NOTIFY_BUF_BYTES
 
+// #define FFP_SHOW_VTB_IN_DECODING
+
 #endif
diff --git a/ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijkplayer/ios/pipeline/IJKVideoToolBox.m b/ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijkplayer/ios/pipeline/IJKVideoToolBox.m
index e4b66415be0ee7dff9aa052030cccfa5c1997662..a1994d0691b5d5510c6258578e3b545ea0dc829a 100644
--- a/ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijkplayer/ios/pipeline/IJKVideoToolBox.m
+++ b/ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijkplayer/ios/pipeline/IJKVideoToolBox.m
@@ -31,6 +31,7 @@
 #include "libavformat/avc.h"
 #include "ijksdl_vout_ios_gles2.h"
 #include "h264_sps_parser.h"
+#include "ijkplayer/ff_ffplay_debug.h"
 
 #define IJK_VTB_FCC_AVC    SDL_FOURCC('C', 'c', 'v', 'a')
 #define IJK_VTB_FCC_ESD    SDL_FOURCC('s', 'd', 's', 'e')
@@ -349,6 +350,9 @@ void VTDecoderCallback(void *decompressionOutputRefCon,
             newFrame->serial = sample_info->serial;
             newFrame->nextframe = NULL;
             sample_info_recycle(ctx, sample_info);
+#ifdef FFP_SHOW_VTB_IN_DECODING
+            ALOGD("VTB: indecoding: %d\n", ctx->sample_infos_in_decoding);
+#endif
         }
 
         ctx->last_sort = newFrame->sort;