diff --git a/libavfilter/vf_framerate.c b/libavfilter/vf_framerate.c
index cdaaf7d..3279161 100644
--- a/libavfilter/vf_framerate.c
+++ b/libavfilter/vf_framerate.c
@@ -24,7 +24,7 @@
  * filter for upsampling or downsampling a progressive source
  */
 
-#define DEBUG
+/* #define DEBUG */
 
 #include "libavutil/avassert.h"
 #include "libavutil/cpu.h"
@@ -199,7 +199,7 @@
 #ifdef DEBUG
     av_dlog(ctx, "process_work_frame()\n");
 
-    av_dlog(ctx, "process_work_frame() pending_input_frames %d\n", priv_ctx->pending_srce_frames);
+    av_dlog(ctx, "process_work_frame() pending_input_frames:%d\n", priv_ctx->pending_srce_frames);
 
     if (priv_ctx->srce[prev]) av_dlog(ctx, "process_work_frame() srce prev pts:%"PRId64"\n", priv_ctx->srce[prev]->pts);
     if (priv_ctx->srce[crnt]) av_dlog(ctx, "process_work_frame() srce crnt pts:%"PRId64"\n", priv_ctx->srce[crnt]->pts);
@@ -405,6 +405,18 @@
     av_assert0(priv_ctx->srce[next]);
     av_assert0(priv_ctx->srce[crnt]);
 
+#ifdef DEBUG
+    av_dlog(ctx, "set_work_frame_pts() srce crnt pts:%"PRId64"\n", priv_ctx->srce[crnt]->pts);
+    av_dlog(ctx, "set_work_frame_pts() srce next pts:%"PRId64"\n", priv_ctx->srce[next]->pts);
+    if (priv_ctx->srce[prev]) {
+        av_dlog(ctx, "set_work_frame_pts() srce prev pts:%"PRId64"\n", priv_ctx->srce[prev]->pts);
+    }
+#endif
+
+    average_srce_pts_delta = priv_ctx->average_srce_pts_dest_delta;
+#ifdef DEBUG
+    av_dlog(ctx, "set_work_frame_pts() initial average srce pts:%d\n", average_srce_pts_delta);
+#endif
     // calculate the PTS delta
     if ((pts = (priv_ctx->srce[next]->pts - priv_ctx->srce[crnt]->pts))) {
         average_srce_pts_delta = average_srce_pts_delta?((average_srce_pts_delta+pts)>>1):pts;
@@ -413,9 +425,10 @@
     }
 
     priv_ctx->average_srce_pts_dest_delta = av_rescale_q(average_srce_pts_delta, priv_ctx->srce_time_base, priv_ctx->dest_time_base);
+
 #ifdef DEBUG
-    av_dlog(ctx, "set_work_frame_pts() average srce pts:%d\n", average_srce_pts_delta);
-    av_dlog(ctx, "set_work_frame_pts() average srce pts:%d at dest time base:%u/%u\n",
+    av_dlog(ctx, "set_work_frame_pts() calculated average srce pts:%d\n", average_srce_pts_delta);
+    av_dlog(ctx, "set_work_frame_pts() calculated average srce pts:%d at dest time base:%u/%u\n",
             priv_ctx->average_srce_pts_dest_delta, priv_ctx->dest_time_base.num, priv_ctx->dest_time_base.den);
 #endif
 
@@ -436,7 +449,7 @@
 
         //        av_log(ctx, AV_LOG_DEBUG, "set_frame_pts() average output pts from input timebase\n");
 #ifdef DEBUG
-        av_dlog(ctx, "set_work_frame_pts() average dest pts:%d\n", priv_ctx->average_dest_pts_delta);
+        av_dlog(ctx, "set_work_frame_pts() calculated average dest pts:%d\n", priv_ctx->average_dest_pts_delta);
 #endif
 //    }
 //        else {
@@ -454,7 +467,7 @@
     }
 
 #ifdef DEBUG
-    av_dlog(ctx, "set_work_frame_pts() calculated pts:%"PRId64" at dest time base:%u/%u\n",
+    av_dlog(ctx, "set_work_frame_pts() calculated dest pts:%"PRId64" at dest time base:%u/%u\n",
             priv_ctx->work->pts, priv_ctx->dest_time_base.num, priv_ctx->dest_time_base.den);
 #endif
 }