diff --git a/include/gpac/ietf.h b/include/gpac/ietf.h
index 4920e68dc1..faf4a51553 100644
--- a/include/gpac/ietf.h
+++ b/include/gpac/ietf.h
@@ -1413,6 +1413,8 @@ enum
 #endif
 	/*use VVC transport (no RFC yet)*/
 	GF_RTP_PAYT_VVC,
+	/*use opus audio format*/
+	GF_RTP_PAYT_OPUS,
 };
 
 
diff --git a/include/gpac/internal/ietf_dev.h b/include/gpac/internal/ietf_dev.h
index d8642a689e..069d57eac4 100644
--- a/include/gpac/internal/ietf_dev.h
+++ b/include/gpac/internal/ietf_dev.h
@@ -447,6 +447,7 @@ GF_Err gp_rtp_builder_do_ac3(GP_RTPPacketizer *builder, u8 *data, u32 data_size,
 GF_Err gp_rtp_builder_do_hevc(GP_RTPPacketizer *builder, u8 *data, u32 data_size, u8 IsAUEnd, u32 FullAUSize);
 GF_Err gp_rtp_builder_do_mp2t(GP_RTPPacketizer *builder, u8 *data, u32 data_size, u8 IsAUEnd, u32 FullAUSize);
 GF_Err gp_rtp_builder_do_vvc(GP_RTPPacketizer *builder, u8 *data, u32 data_size, u8 IsAUEnd, u32 FullAUSize);
+GF_Err gp_rtp_builder_do_opus(GP_RTPPacketizer *builder, u8 *data, u32 data_size, u8 IsAUEnd, u32 FullAUSize);
 
 #define RTP_VVC_AGG_NAL		0x1C //28
 #define RTP_VVC_FRAG_NAL	0x1D //29
@@ -477,6 +478,8 @@ struct __tag_rtp_depacketizer
 	GP_RTPSLMap sl_map;
 	/*! RTP clock rate*/
 	u32 clock_rate;
+	/*! audio channels from RTP map*/
+	u32 audio_channels;
 
 	//! clip rect X
 	u32 x;
diff --git a/include/gpac/rtp_streamer.h b/include/gpac/rtp_streamer.h
index fc88dc9cd3..c45a71180a 100644
--- a/include/gpac/rtp_streamer.h
+++ b/include/gpac/rtp_streamer.h
@@ -134,11 +134,12 @@ Gets the SDP asscoiated with all media in the streaming session (only media part
 \param tx text window horizontal offset
 \param ty text window vertical offset
 \param tl text window z-index
+\param nb_chan number of audio channels, 0 if unknown
 \param for_rtsp if GF_TRUE, produces the SDP for an RTSP describe (no port info)
 \param out_sdp_buffer location to the SDP buffer to allocate and fill
 \return error if any
  */
-GF_Err gf_rtp_streamer_append_sdp_extended(GF_RTPStreamer *rtp, u16 ESID, const u8 *dsi, u32 dsi_len, const u8 *dsi_enh, u32 dsi_enh_len, char *KMS_URI, u32 width, u32 height, u32 tw, u32 th, s32 tx, s32 ty, s16 tl, Bool for_rtsp, char **out_sdp_buffer);
+GF_Err gf_rtp_streamer_append_sdp_extended(GF_RTPStreamer *rtp, u16 ESID, const u8 *dsi, u32 dsi_len, const u8 *dsi_enh, u32 dsi_enh_len, char *KMS_URI, u32 width, u32 height, u32 tw, u32 th, s32 tx, s32 ty, s16 tl, u32 nb_chan, Bool for_rtsp, char **out_sdp_buffer);
 
 /*! sends a full Access Unit over RTP
 \param rtp the target RTP streamer
diff --git a/src/filters/in_rtp.c b/src/filters/in_rtp.c
index b13465250c..217b481841 100644
--- a/src/filters/in_rtp.c
+++ b/src/filters/in_rtp.c
@@ -539,8 +539,6 @@ static GF_Err rtpin_process(GF_Filter *filter)
 			break;
 		}
 
-		ctx->eos_probe_start = 0;
-
 		i=0;
 		while ((stream = (GF_RTPInStream *)gf_list_enum(ctx->streams, &i))) {
 			if (stream->status==RTP_Running) {
@@ -548,15 +546,15 @@ static GF_Err rtpin_process(GF_Filter *filter)
 				read += rtpin_stream_read(stream);
 			}
 
-			if (stream->flags & RTP_EOS) {
+			if ((stream->flags & RTP_EOS) && !ctx->eos_probe_start)
 				ctx->eos_probe_start = gf_sys_clock();
-			}
 		}
 
 		if (!read) {
 			break;
 		}
 		tot_read+=read;
+		ctx->eos_probe_start = 0;
 	}
 
 	//we wait max 300ms to detect eos
diff --git a/src/filters/in_rtp_stream.c b/src/filters/in_rtp_stream.c
index 05bc1e3313..095926cb21 100644
--- a/src/filters/in_rtp_stream.c
+++ b/src/filters/in_rtp_stream.c
@@ -715,7 +715,6 @@ u32 rtpin_stream_read(GF_RTPInStream *stream)
 		size = gf_rtp_read_rtp(stream->rtp_ch, stream->buffer, stream->rtpin->block_size);
 		if (size) {
 			tot_size += size;
-			stream->rtpin->udp_timeout = 0;
 			rtpin_stream_on_rtp_pck(stream, stream->buffer, size);
 		}
 	}
@@ -728,16 +727,25 @@ u32 rtpin_stream_read(GF_RTPInStream *stream)
 	if (stream->rtpin->udp_timeout) {
 		if (!stream->last_udp_time) {
 			stream->last_udp_time = gf_sys_clock();
-		} else if (stream->rtp_ch->net_info.IsUnicast) {
+		} else if (stream->rtp_bytes || stream->rtp_ch->net_info.IsUnicast) {
 			u32 diff = gf_sys_clock() - stream->last_udp_time;
 			if (diff >= stream->rtpin->udp_timeout) {
-				GF_LOG(GF_LOG_WARNING, GF_LOG_RTP, ("[RTP] UDP Timeout after %d ms on stream %d%s\n", diff, stream->ES_ID,
-					(stream->rtpin->session && stream->rtpin->autortsp) ? ", retrying using TCP" : ""));
-
-				if (stream->rtpin->autortsp && stream->rtpin->session && !stream->rtpin->retry_tcp) {
-					stream->rtpin->retry_tcp = GF_TRUE;
+				if (stream->rtp_bytes) {
+					if (! (stream->flags & RTP_EOS)) {
+						GF_LOG(GF_LOG_WARNING, GF_LOG_RTP, ("[RTP] No packet received for %d ms on stream %d, assuming EOS\n", diff, stream->ES_ID));
+						stream->flags |= RTP_EOS;
+					}
 				} else {
-					gf_filter_pid_set_eos(stream->opid);
+					if (! (stream->flags & RTP_EOS) && !stream->rtpin->retry_tcp) {
+						GF_LOG(GF_LOG_WARNING, GF_LOG_RTP, ("[RTP] UDP Timeout after %d ms on stream %d%s\n", diff, stream->ES_ID,
+						(stream->rtpin->session && stream->rtpin->autortsp) ? ", retrying using TCP" : ""));
+					}
+
+					if (stream->rtpin->autortsp && stream->rtpin->session && !stream->rtpin->retry_tcp) {
+						stream->rtpin->retry_tcp = GF_TRUE;
+					} else {
+						stream->flags |= RTP_EOS;
+					}
 				}
 			}
 		}
diff --git a/src/filters/out_rtp.c b/src/filters/out_rtp.c
index da5a8d48a0..fca894d620 100644
--- a/src/filters/out_rtp.c
+++ b/src/filters/out_rtp.c
@@ -182,6 +182,7 @@ GF_Err rtpout_create_sdp(GF_List *streams, Bool is_rtsp, const char *ip, const c
 		s16 tl;
 		u32 dsi_len = 0;
 		u32 dsi_enh_len = 0;
+		u32 nb_chan = 0;
         const GF_PropertyValue *p;
 		GF_RTPOutStream *stream = gf_list_get(streams, i);
 		if (!stream->rtp) continue;
@@ -208,6 +209,9 @@ GF_Err rtpout_create_sdp(GF_List *streams, Bool is_rtsp, const char *ip, const c
 		p = gf_filter_pid_get_property(stream->pid, GF_PROP_PID_HEIGHT);
 		if (p) h = p->value.uint;
 
+		p = gf_filter_pid_get_property(stream->pid, GF_PROP_PID_NUM_CHANNELS);
+		if (p) nb_chan = p->value.uint;
+
 		p = gf_filter_pid_get_property(stream->pid, GF_PROP_PID_PROTECTION_KMS_URI);
 		if (p) KMS = p->value.string;
 
@@ -228,7 +232,7 @@ GF_Err rtpout_create_sdp(GF_List *streams, Bool is_rtsp, const char *ip, const c
 			if (p) h = p->value.uint;
 		}
 
-		gf_rtp_streamer_append_sdp_extended(stream->rtp, stream->id, dsi, dsi_len, dsi_enh, dsi_enh_len, (char *)KMS, w, h, tw, th, tx, ty, tl, is_rtsp, &sdp_media);
+		gf_rtp_streamer_append_sdp_extended(stream->rtp, stream->id, dsi, dsi_len, dsi_enh, dsi_enh_len, (char *)KMS, w, h, tw, th, tx, ty, tl, nb_chan, is_rtsp, &sdp_media);
 
 		if (sdp_media) {
 			gf_fprintf(sdp_out, "%s", sdp_media);
diff --git a/src/ietf/rtp_depacketizer.c b/src/ietf/rtp_depacketizer.c
index 4d2337bb27..da604b40e9 100644
--- a/src/ietf/rtp_depacketizer.c
+++ b/src/ietf/rtp_depacketizer.c
@@ -1186,6 +1186,21 @@ static void gf_rtp_parse_eac3(GF_RTPDepacketizer *rtp, GF_RTPHeader *hdr, u8 *pa
 {
 	gf_rtp_parse_ac3_eac3(rtp, hdr, payload, size, GF_TRUE);
 }
+
+
+static void gf_rtp_parse_opus(GF_RTPDepacketizer *rtp, GF_RTPHeader *hdr, u8 *payload, u32 size)
+{
+	rtp->sl_hdr.compositionTimeStampFlag = 1;
+	if (rtp->sl_hdr.compositionTimeStamp != hdr->TimeStamp) {
+		rtp->sl_hdr.accessUnitStartFlag = 1;
+		rtp->sl_hdr.compositionTimeStamp = hdr->TimeStamp;
+	}
+	rtp->sl_hdr.randomAccessPointFlag = 1;
+	rtp->on_sl_packet(rtp->udta, payload, size, &rtp->sl_hdr, GF_OK);
+	rtp->flags |= GF_RTP_NEW_AU;
+	rtp->sl_hdr.accessUnitStartFlag = 0;
+}
+
 #endif /*GPAC_DISABLE_AV_PARSERS*/
 
 static u32 gf_rtp_get_payload_type(GF_RTPMap *map, GF_SDPMedia *media)
@@ -1233,6 +1248,7 @@ static u32 gf_rtp_get_payload_type(GF_RTPMap *map, GF_SDPMedia *media)
 	else if (!stricmp(map->payload_name, "H265")) return GF_RTP_PAYT_HEVC;
 	else if (!stricmp(map->payload_name, "H265-SHVC")) return GF_RTP_PAYT_LHVC;
 	else if (!stricmp(map->payload_name, "H266")) return GF_RTP_PAYT_VVC;
+	else if (!stricmp(map->payload_name, "opus")) return GF_RTP_PAYT_OPUS;
 	else return 0;
 }
 
@@ -1839,6 +1855,25 @@ static GF_Err gf_rtp_payt_setup(GF_RTPDepacketizer *rtp, GF_RTPMap *map, GF_SDPM
 		rtp->sl_map.RandomAccessIndication = GF_TRUE;
 		/*assign depacketizer*/
 		rtp->depacketize = gf_rtp_parse_eac3;
+		break;
+	case GF_RTP_PAYT_OPUS:
+		rtp->sl_map.StreamType = GF_STREAM_AUDIO;
+		rtp->sl_map.CodecID = GF_CODECID_OPUS;
+		rtp->sl_map.RandomAccessIndication = GF_TRUE;
+		/*assign depacketizer*/
+		rtp->depacketize = gf_rtp_parse_opus;
+
+		if (!rtp->sl_map.config) {
+			GF_OpusConfig opcfg;
+			opcfg.version = 1;
+			opcfg.OutputChannelCount = rtp->audio_channels;
+			opcfg.PreSkip = 0;
+			opcfg.InputSampleRate = rtp->clock_rate;
+			opcfg.OutputGain = 0;
+			opcfg.ChannelMappingFamily = 0;
+			gf_odf_opus_cfg_write(&opcfg, &rtp->sl_map.config, &rtp->sl_map.configSize);
+		}
+
 		break;
 #endif /*GPAC_DISABLE_AV_PARSERS*/
 	default:
@@ -1898,7 +1933,7 @@ GF_RTPDepacketizer *gf_rtp_depacketizer_new(GF_SDPMedia *media, u32 hdr_payt, gf
 	GF_RTPMap *map = NULL;
 	u32 payt;
 	GF_RTPDepacketizer *tmp;
-	u32 clock_rate;
+	u32 clock_rate, nb_chan=0;
 	const GF_RTPStaticMap *static_map = NULL;
 
 	/*check RTP map. For now we only support 1 RTPMap*/
@@ -1917,6 +1952,8 @@ GF_RTPDepacketizer *gf_rtp_depacketizer_new(GF_SDPMedia *media, u32 hdr_payt, gf
 			return NULL;
 		}
 		clock_rate = static_map->clock_rate;
+		if (static_map->stream_type==GF_STREAM_AUDIO)
+			nb_chan = 1;
 		payt = hdr_payt;
 	} else {
 		/*check payload type*/
@@ -1932,10 +1969,13 @@ GF_RTPDepacketizer *gf_rtp_depacketizer_new(GF_SDPMedia *media, u32 hdr_payt, gf
 				return NULL;
 			}
 			clock_rate = static_map->clock_rate;
+			if (static_map->stream_type==GF_STREAM_AUDIO)
+				nb_chan = 1;
 		} else {
 			payt = gf_rtp_get_payload_type(map, media);
 			if (!payt) return NULL;
 			clock_rate = map->ClockRate;
+			nb_chan = map->AudioChannels;
 		}
 	}
 
@@ -1943,6 +1983,8 @@ GF_RTPDepacketizer *gf_rtp_depacketizer_new(GF_SDPMedia *media, u32 hdr_payt, gf
 	if (!tmp) return NULL;
 	tmp->payt = payt;
 	tmp->static_map = static_map;
+	tmp->clock_rate = clock_rate;
+	tmp->audio_channels = nb_chan;
 
 	e = gf_rtp_payt_setup(tmp, map, media);
 	if (e) {
@@ -1951,7 +1993,6 @@ GF_RTPDepacketizer *gf_rtp_depacketizer_new(GF_SDPMedia *media, u32 hdr_payt, gf
 	}
 
 	assert(tmp->depacketize);
-	tmp->clock_rate = clock_rate;
 	tmp->on_sl_packet = sl_packet_cbk;
 	tmp->udta = udta;
 	return tmp;
diff --git a/src/ietf/rtp_packetizer.c b/src/ietf/rtp_packetizer.c
index 639fcb9b37..a667b0e190 100644
--- a/src/ietf/rtp_packetizer.c
+++ b/src/ietf/rtp_packetizer.c
@@ -127,6 +127,8 @@ GF_Err gf_rtp_builder_process(GP_RTPPacketizer *builder, u8 *data, u32 data_size
 		return gp_rtp_builder_do_vvc(builder, data, data_size, IsAUEnd, FullAUSize);
 	case GF_RTP_PAYT_MP2T:
 		return gp_rtp_builder_do_mp2t(builder, data, data_size, IsAUEnd, FullAUSize);
+	case GF_RTP_PAYT_OPUS:
+		return gp_rtp_builder_do_opus(builder, data, data_size, IsAUEnd, FullAUSize);
 	default:
 		return GF_NOT_SUPPORTED;
 	}
@@ -542,6 +544,10 @@ Bool gf_rtp_builder_get_payload_name(GP_RTPPacketizer *rtpb, char szPayloadName[
 		strcpy(szMediaName, "audio");
 		strcpy(szPayloadName, "eac3");
 		return GF_TRUE;
+	case GF_RTP_PAYT_OPUS:
+		strcpy(szMediaName, "audio");
+		strcpy(szPayloadName, "opus");
+		return GF_TRUE;
 	case GF_RTP_PAYT_H264_SVC:
 		strcpy(szMediaName, "video");
 		strcpy(szPayloadName, "H264-SVC");
diff --git a/src/ietf/rtp_pck_3gpp.c b/src/ietf/rtp_pck_3gpp.c
index a63a831fb6..7482edc845 100644
--- a/src/ietf/rtp_pck_3gpp.c
+++ b/src/ietf/rtp_pck_3gpp.c
@@ -817,5 +817,32 @@ GF_Err gp_rtp_builder_do_ac3(GP_RTPPacketizer *builder, u8 *data, u32 data_size,
 	return GF_OK;
 }
 
+GF_Err gp_rtp_builder_do_opus(GP_RTPPacketizer *builder, u8 *data, u32 data_size, u8 IsAUEnd, u32 FullAUSize)
+{
+	/*flush*/
+	if (!data) return GF_OK;
+
+	/*fits*/
+	if (data_size > builder->Path_MTU) {
+		GF_LOG(GF_LOG_ERROR, GF_LOG_RTP, ("[RTPOpus] Packet size %u larger MTU %u but Opus fragmentation is not yet supported, pacth welcome\n", data_size, builder->Path_MTU ));
+		return GF_NOT_SUPPORTED;
+	}
+	/*send new packet*/
+	builder->rtp_header.TimeStamp = (u32) builder->sl_header.compositionTimeStamp;
+	builder->rtp_header.Marker = 0;
+	builder->rtp_header.SequenceNumber += 1;
+	builder->OnNewPacket(builder->cbk_obj, &builder->rtp_header);
+
+	/*add payload*/
+	if (builder->OnDataReference)
+		builder->OnDataReference(builder->cbk_obj, data_size, 0);
+	else
+		builder->OnData(builder->cbk_obj, data, data_size, GF_FALSE);
+
+	builder->OnPacketDone(builder->cbk_obj, &builder->rtp_header);
+	builder->last_au_sn++;
+	return GF_OK;
+}
+
 #endif /*GPAC_DISABLE_STREAMING*/
 
diff --git a/src/ietf/rtp_streamer.c b/src/ietf/rtp_streamer.c
index 06b9863902..6c02c5d64b 100644
--- a/src/ietf/rtp_streamer.c
+++ b/src/ietf/rtp_streamer.c
@@ -401,6 +401,11 @@ GF_RTPStreamer *gf_rtp_streamer_new(u32 streamType, u32 codecid, u32 timeScale,
 		PayloadType = OfficialPayloadType = GF_RTP_PAYT_MP2T;
 		required_rate = 90000;
 		break;
+	case GF_CODECID_OPUS:
+		rtp_type = GF_RTP_PAYT_OPUS;
+		streamType = GF_STREAM_AUDIO;
+		has_mpeg4_mapping = GF_FALSE;
+		break;
 
 	default:
 		if (!rtp_type) {
@@ -527,7 +532,7 @@ void gf_media_format_ttxt_sdp(GP_RTPPacketizer *builder, char *payload_name, cha
 
 
 GF_EXPORT
-GF_Err gf_rtp_streamer_append_sdp_extended(GF_RTPStreamer *rtp, u16 ESID, const u8 *dsi, u32 dsi_len, const u8 *dsi_enh, u32 dsi_enh_len, char *KMS_URI, u32 width, u32 height, u32 tw, u32 th, s32 tx, s32 ty, s16 tl, Bool for_rtsp, char **out_sdp_buffer)
+GF_Err gf_rtp_streamer_append_sdp_extended(GF_RTPStreamer *rtp, u16 ESID, const u8 *dsi, u32 dsi_len, const u8 *dsi_enh, u32 dsi_enh_len, char *KMS_URI, u32 width, u32 height, u32 tw, u32 th, s32 tx, s32 ty, s16 tl, u32 nb_channels, Bool for_rtsp, char **out_sdp_buffer)
 {
 	u32 size;
 	u16 port=0;
@@ -540,14 +545,18 @@ GF_Err gf_rtp_streamer_append_sdp_extended(GF_RTPStreamer *rtp, u16 ESID, const
 	if (!for_rtsp)
 		gf_rtp_get_ports(rtp->channel, &port, NULL);
 
-	sprintf(sdp, "m=%s %d RTP/%s %d\n", mediaName, for_rtsp ? 0 : port, rtp->packetizer->slMap.IV_length ? "SAVP" : "AVP", rtp->packetizer->PayloadType);
-	sprintf(sdpLine, "a=rtpmap:%d %s/%d\n", rtp->packetizer->PayloadType, payloadName, rtp->packetizer->sl_config.timestampResolution);
+	sprintf(sdp, "m=%s %d RTP/%s %u\n", mediaName, for_rtsp ? 0 : port, rtp->packetizer->slMap.IV_length ? "SAVP" : "AVP", rtp->packetizer->PayloadType);
+	if (nb_channels)
+		sprintf(sdpLine, "a=rtpmap:%u %s/%u/%u\n", rtp->packetizer->PayloadType, payloadName, rtp->packetizer->sl_config.timestampResolution, nb_channels);
+	else
+		sprintf(sdpLine, "a=rtpmap:%u %s/%u\n", rtp->packetizer->PayloadType, payloadName, rtp->packetizer->sl_config.timestampResolution);
 	strcat(sdp, sdpLine);
 
 	if (ESID
 #if GPAC_ENABLE_3GPP_DIMS_RTP
 		&& (rtp->packetizer->rtp_payt != GF_RTP_PAYT_3GPP_DIMS)
 #endif
+		&& (rtp->packetizer->rtp_payt != GF_RTP_PAYT_OPUS)
 	 ) {
 		sprintf(sdpLine, "a=mpeg4-esid:%d\n", ESID);
 		strcat(sdp, sdpLine);
@@ -766,7 +775,7 @@ char *gf_rtp_streamer_format_sdp_header(char *app_name, char *ip_dest, char *ses
 GF_EXPORT
 GF_Err gf_rtp_streamer_append_sdp(GF_RTPStreamer *rtp, u16 ESID, const u8 *dsi, u32 dsi_len, char *KMS_URI, char **out_sdp_buffer)
 {
-	return gf_rtp_streamer_append_sdp_extended(rtp, ESID, dsi, dsi_len, NULL, 0, KMS_URI, 0, 0, 0, 0, 0, 0, 0, GF_FALSE, out_sdp_buffer);
+	return gf_rtp_streamer_append_sdp_extended(rtp, ESID, dsi, dsi_len, NULL, 0, KMS_URI, 0, 0, 0, 0, 0, 0, 0, 0, GF_FALSE, out_sdp_buffer);
 }
 
 GF_EXPORT
diff --git a/src/media_tools/isom_hinter.c b/src/media_tools/isom_hinter.c
index 40d067c028..72265b7b97 100644
--- a/src/media_tools/isom_hinter.c
+++ b/src/media_tools/isom_hinter.c
@@ -537,6 +537,11 @@ GF_RTPHinter *gf_hinter_track_new(GF_ISOFile *file, u32 TrackNum,
 			streamType = GF_STREAM_AUDIO;
 			gf_isom_get_audio_info(file, TrackNum, 1, NULL, &nb_ch, NULL);
 			break;
+		case GF_ISOM_SUBTYPE_OPUS:
+			hintType = GF_RTP_PAYT_OPUS;
+			streamType = GF_STREAM_AUDIO;
+			gf_isom_get_audio_info(file, TrackNum, 1, NULL, &nb_ch, NULL);
+			break;
 		case GF_ISOM_SUBTYPE_MP3:
 		{
 			GF_ISOSample *samp = gf_isom_get_sample(file, TrackNum, 1, NULL);
diff --git a/src/odf/descriptors.c b/src/odf/descriptors.c
index 089a0848f7..9682be48ad 100644
--- a/src/odf/descriptors.c
+++ b/src/odf/descriptors.c
@@ -1826,6 +1826,7 @@ GF_Err gf_odf_ac3_config_parse(u8 *dsi, u32 dsi_len, Bool is_ec3, GF_AC3Config *
 
 GF_Err gf_odf_opus_cfg_parse_bs(GF_BitStream *bs, GF_OpusConfig *cfg)
 {
+	memset(cfg, 0, sizeof(GF_OpusConfig));
 	cfg->version = gf_bs_read_u8(bs);
 	cfg->OutputChannelCount = gf_bs_read_u8(bs);
 	cfg->PreSkip = gf_bs_read_u16_le(bs);