diff --git a/coreapi/linphonecall.c b/coreapi/linphonecall.c
index 4380ecbeb..261a8d763 100644
--- a/coreapi/linphonecall.c
+++ b/coreapi/linphonecall.c
@@ -1885,6 +1885,7 @@ static RtpProfile *make_profile(LinphoneCall *call, const SalMediaDescription *m
 	const LinphoneCallParams *params=&call->params;
 
 	*used_pt=-1;
+
 	if (desc->type==SalAudio)
 		bw=get_ideal_audio_bw(call,md,desc);
 	else if (desc->type==SalVideo)
@@ -1911,6 +1912,7 @@ static RtpProfile *make_profile(LinphoneCall *call, const SalMediaDescription *m
 			first=FALSE;
 		}
 		if (pt->flags & PAYLOAD_TYPE_BITRATE_OVERRIDE){
+			ms_message("Payload type [%s/%i] has explicit bitrate [%i] kbit/s", pt->mime_type, pt->clock_rate, pt->normal_bitrate/1000);
 			pt->normal_bitrate=get_min_bandwidth(pt->normal_bitrate,bw*1000);
 		} else pt->normal_bitrate=bw*1000;
 		if (desc->ptime>0){
@@ -2227,11 +2229,15 @@ void linphone_call_start_media_streams(LinphoneCall *call, bool_t all_inputs_mut
 		use_arc=FALSE;
 	}
 #endif
+	ms_message("linphone_call_start_media_streams() call=[%p] local upload_bandwidth=[%i] kbit/s; local download_bandwidth=[%i] kbit/s",
+		   call, linphone_core_get_upload_bandwidth(lc),linphone_core_get_download_bandwidth(lc));
+
 	if (call->audiostream!=NULL) {
 		linphone_call_start_audio_stream(call,cname,all_inputs_muted,send_ringbacktone,use_arc);
 	}
 	call->current_params.has_video=FALSE;
 	if (call->videostream!=NULL) {
+		if (call->audiostream) audio_stream_link_video(call->audiostream,call->videostream);
 		linphone_call_start_video_stream(call,cname,all_inputs_muted);
 	}
 
@@ -2352,7 +2358,7 @@ static void linphone_call_log_fill_stats(LinphoneCallLog *log, MediaStream *st){
 	}
 }
 
-void linphone_call_stop_audio_stream(LinphoneCall *call) {
+static void linphone_call_stop_audio_stream(LinphoneCall *call) {
 	if (call->audiostream!=NULL) {
 		linphone_reporting_update_media_info(call, LINPHONE_CALL_STATS_AUDIO);
 		media_stream_reclaim_sessions(&call->audiostream->ms,&call->sessions[0]);
@@ -2380,7 +2386,7 @@ void linphone_call_stop_audio_stream(LinphoneCall *call) {
 	}
 }
 
-void linphone_call_stop_video_stream(LinphoneCall *call) {
+static void linphone_call_stop_video_stream(LinphoneCall *call) {
 #ifdef VIDEO_ENABLED
 	if (call->videostream!=NULL){
 		linphone_reporting_update_media_info(call, LINPHONE_CALL_STATS_VIDEO);
@@ -2404,6 +2410,8 @@ static void unset_rtp_profile(LinphoneCall *call, int i){
 
 void linphone_call_stop_media_streams(LinphoneCall *call){
 	if (call->audiostream || call->videostream) {
+		if (call->audiostream && call->videostream)
+			audio_stream_unlink_video(call->audiostream, call->videostream);
 		linphone_call_stop_audio_stream(call);
 		linphone_call_stop_video_stream(call);
 
diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index 0b49be7cc..7380ebb80 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -5939,7 +5939,7 @@ static void linphone_core_uninit(LinphoneCore *lc)
 		linphone_presence_model_unref(lc->presence_model);
 	}
 	linphone_core_free_payload_types(lc);
-
+	if (lc->supported_formats) ms_free(lc->supported_formats);
 	linphone_core_message_storage_close(lc);
 	ms_exit();
 	linphone_core_set_state(lc,LinphoneGlobalOff,"Off");
diff --git a/coreapi/linphonecore.h b/coreapi/linphonecore.h
index a4e91e2c3..9da626732 100644
--- a/coreapi/linphonecore.h
+++ b/coreapi/linphonecore.h
@@ -2612,6 +2612,14 @@ LINPHONE_PUBLIC void linphone_core_set_tone(LinphoneCore *lc, LinphoneToneID id,
  * */
 LINPHONE_PUBLIC void linphone_core_set_file_transfer_server(LinphoneCore *core, const char * server_url);
 
+/**
+ * Returns a null terminated table of strings containing the file format extension supported for call recording.
+ * @param core the core
+ * @return the supported formats, typically 'wav' and 'mkv'
+ * @ingroup media_parameters
+**/
+LINPHONE_PUBLIC const char ** linphone_core_get_supported_file_formats(LinphoneCore *core);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/coreapi/misc.c b/coreapi/misc.c
index 43b3a3139..0cc6a3ac9 100644
--- a/coreapi/misc.c
+++ b/coreapi/misc.c
@@ -1522,3 +1522,18 @@ const MSCryptoSuite * linphone_core_get_srtp_crypto_suites(LinphoneCore *lc){
 	lc->rtp_conf.srtp_suites=result;
 	return result;
 }
+
+
+
+const char ** linphone_core_get_supported_file_formats(LinphoneCore *core){
+	static const char *mkv="mkv";
+	static const char *wav="wav";
+	if (core->supported_formats==NULL){
+		core->supported_formats=ms_malloc0(3*sizeof(char*));
+		core->supported_formats[0]=wav;
+        if (ms_factory_lookup_filter_by_id(ms_factory_get_fallback(),MS_MKV_RECORDER_ID)){
+			core->supported_formats[1]=mkv;
+		}
+	}
+	return core->supported_formats;
+}
diff --git a/coreapi/private.h b/coreapi/private.h
index 690498c98..79537e742 100644
--- a/coreapi/private.h
+++ b/coreapi/private.h
@@ -375,8 +375,6 @@ void linphone_call_init_video_stream(LinphoneCall *call);
 void linphone_call_init_media_streams(LinphoneCall *call);
 void linphone_call_start_media_streams(LinphoneCall *call, bool_t all_inputs_muted, bool_t send_ringbacktone);
 void linphone_call_start_media_streams_for_ice_gathering(LinphoneCall *call);
-void linphone_call_stop_audio_stream(LinphoneCall *call);
-void linphone_call_stop_video_stream(LinphoneCall *call);
 void linphone_call_stop_media_streams(LinphoneCall *call);
 void linphone_call_delete_ice_session(LinphoneCall *call);
 void linphone_call_delete_upnp_session(LinphoneCall *call);
@@ -727,6 +725,7 @@ struct _LinphoneCore
 	MSList *tones;
 	LinphoneReason chat_deny_code;
 	char *file_transfer_server;
+	const char **supported_formats;
 };
 
 
diff --git a/gtk/main.c b/gtk/main.c
index 4dd4f1a1f..a08681dde 100644
--- a/gtk/main.c
+++ b/gtk/main.c
@@ -983,6 +983,9 @@ gchar *linphone_gtk_get_record_path(const LinphoneAddress *address, gboolean is_
 	char date[64]={0};
 	time_t curtime=time(NULL);
 	struct tm loctime;
+	const char **fmts=linphone_core_get_supported_file_formats(linphone_gtk_get_core());
+	int i;
+	const char *ext="wav";
 
 #ifdef WIN32
 	loctime=*localtime(&curtime);
@@ -991,19 +994,26 @@ gchar *linphone_gtk_get_record_path(const LinphoneAddress *address, gboolean is_
 #endif
 	snprintf(date,sizeof(date)-1,"%i%02i%02i-%02i%02i",loctime.tm_year+1900,loctime.tm_mon+1,loctime.tm_mday, loctime.tm_hour, loctime.tm_min);
 
+	for (i=0;fmts[i]!=NULL;++i){
+		if (strcmp(fmts[i],"mkv")==0){
+			ext="mkv";
+			break;
+		}
+	}
+	
 	if (address){
 		id=linphone_address_get_username(address);
 		if (id==NULL) id=linphone_address_get_domain(address);
 	}
 	if (is_conference){
-		snprintf(filename,sizeof(filename)-1,"%s-conference-%s.wav",
+		snprintf(filename,sizeof(filename)-1,"%s-conference-%s.%s",
 			linphone_gtk_get_ui_config("title","Linphone"),
-			date);
+			date,ext);
 	}else{
-		snprintf(filename,sizeof(filename)-1,"%s-call-%s-%s.wav",
+		snprintf(filename,sizeof(filename)-1,"%s-call-%s-%s.%s",
 			linphone_gtk_get_ui_config("title","Linphone"),
 			date,
-			id);
+			id,ext);
 	}
 	if (!dir) {
 		ms_message ("No directory for music, using [%s] instead",dir=getenv("HOME"));
diff --git a/mediastreamer2 b/mediastreamer2
index 84ce0753e..5313bf3a5 160000
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 84ce0753edfae002c0f5bcff17f80f6f9c285f14
+Subproject commit 5313bf3a57474411efce3b8f60a8c7190554a619