diff --git a/linphone/mediastreamer2/include/mediastreamer2/msqueue.h b/linphone/mediastreamer2/include/mediastreamer2/msqueue.h
index 2c819ff83..e0b23f6ed 100644
--- a/linphone/mediastreamer2/include/mediastreamer2/msqueue.h
+++ b/linphone/mediastreamer2/include/mediastreamer2/msqueue.h
@@ -74,8 +74,9 @@ void ms_queue_destroy(MSQueue *q);
 #define mblk_set_rate(m,bits)         (m)->reserved2=((m)->reserved2|(bits)<<1)
 #define mblk_get_rate(m)              (((m)->reserved2>>1)&0x3)
 #define mblk_set_payload_type(m,bits) (m)->reserved2=((m)->reserved2|(bits<<3))
-#define mblk_get_payload_type(m)      (((m)->reserved2>>3)&0xFF)
-
+#define mblk_get_payload_type(m)      (((m)->reserved2>>3)&0x7F)
+#define mblk_set_precious_flag(m,bit)    (m)->reserved2=(m)->reserved2|((bit & 0x1)<<10) /*use to prevent mirroring*/
+#define mblk_get_precious_flag(m)    (((m)->reserved2)>>10 & 0x1)
 
 struct _MSBufferizer{
 	queue_t q;
diff --git a/linphone/mediastreamer2/src/msv4l.c b/linphone/mediastreamer2/src/msv4l.c
index 1b2fa7fe8..c93dfa661 100644
--- a/linphone/mediastreamer2/src/msv4l.c
+++ b/linphone/mediastreamer2/src/msv4l.c
@@ -911,7 +911,10 @@ static void v4l_process(MSFilter * obj){
 				om=dupmsg(v4l_make_mire(s));
 			}else {
 				mblk_t *tmpm=v4l_make_nowebcam(s);
-				if (tmpm) om=dupmsg(tmpm);
+				if (tmpm) {
+					om=dupmsg(tmpm);
+					mblk_set_precious_flag(om,1);
+				}
 			}
 		}
 		ms_mutex_unlock(&s->mutex);
diff --git a/linphone/mediastreamer2/src/nowebcam.c b/linphone/mediastreamer2/src/nowebcam.c
index 0b3bae8ff..54406eafc 100644
--- a/linphone/mediastreamer2/src/nowebcam.c
+++ b/linphone/mediastreamer2/src/nowebcam.c
@@ -143,7 +143,12 @@ void static_image_process(MSFilter *f){
 	SIData *d=(SIData*)f->data;
 	/*output a frame every second*/
 	if ((f->ticker->time - d->lasttime>1000) || d->lasttime==0){
-		if (d->pic) ms_queue_put(f->outputs[0],dupb(d->pic));
+		if (d->pic) {
+			mblk_t *o=dupb(d->pic);
+			/*prevent mirroring at the output*/
+			mblk_set_precious_flag(o,1);
+			ms_queue_put(f->outputs[0],o);
+		}
 		d->lasttime=f->ticker->time;
 	}
 }
diff --git a/linphone/mediastreamer2/src/videoout.c b/linphone/mediastreamer2/src/videoout.c
index 80ebc4abc..0d3aeed82 100644
--- a/linphone/mediastreamer2/src/videoout.c
+++ b/linphone/mediastreamer2/src/videoout.c
@@ -695,7 +695,7 @@ static void video_out_process(MSFilter *f){
 					src.h, obj->local_pic.planes, obj->local_pic.strides)<0){
 					ms_error("Error in sws_scale().");
 				}
-				yuv_buf_mirror(&obj->local_pic);
+				if (!mblk_get_precious_flag(inm)) yuv_buf_mirror(&obj->local_pic);
 			}
 		}
 		ms_queue_flush(f->inputs[1]);
diff --git a/linphone/mediastreamer2/src/winvideo.c b/linphone/mediastreamer2/src/winvideo.c
index 15541bfad..f08e8793c 100644
--- a/linphone/mediastreamer2/src/winvideo.c
+++ b/linphone/mediastreamer2/src/winvideo.c
@@ -504,8 +504,10 @@ static void v4w_process(MSFilter * obj){
 			}
 		}else {
 			mblk_t *nowebcam = v4w_make_nowebcam(s);
-			if (nowebcam!=NULL)
+			if (nowebcam!=NULL){
 				om=dupmsg(nowebcam);
+				mblk_set_precious_flag(om,1);
+			}
 		}
 		ms_mutex_unlock(&s->mutex);
 		if (om!=NULL){
diff --git a/linphone/mediastreamer2/src/winvideods.c b/linphone/mediastreamer2/src/winvideods.c
index 523ac1de9..e7e1ecbd5 100644
--- a/linphone/mediastreamer2/src/winvideods.c
+++ b/linphone/mediastreamer2/src/winvideods.c
@@ -1020,8 +1020,10 @@ static void v4w_process(MSFilter * obj){
 			}
 		}else {
 			mblk_t *nowebcam = v4w_make_nowebcam(s);
-			if (nowebcam!=NULL)
+			if (nowebcam!=NULL){
 				om=dupmsg(nowebcam);
+				mblk_set_precious_flag(om,1);
+			}
 		}
 		ms_mutex_unlock(&s->mutex);
 		if (om!=NULL){
diff --git a/linphone/oRTP/src/str_utils.c b/linphone/oRTP/src/str_utils.c
index 09ebad9a6..a38620b30 100644
--- a/linphone/oRTP/src/str_utils.c
+++ b/linphone/oRTP/src/str_utils.c
@@ -129,6 +129,8 @@ mblk_t *dupb(mblk_t *mp)
 	datab_ref(mp->b_datap);
 	newm=(mblk_t *) ortp_malloc(sizeof(mblk_t));
 	mblk_init(newm);
+	newm->reserved1=mp->reserved1;
+	newm->reserved2=mp->reserved2;
 	newm->b_datap=mp->b_datap;
 	newm->b_rptr=mp->b_rptr;
 	newm->b_wptr=mp->b_wptr;