diff --git a/.run/srs-ingest.run.xml b/.run/srs-ingest.run.xml
new file mode 100644
index 000000000..1ef1dba30
--- /dev/null
+++ b/.run/srs-ingest.run.xml
@@ -0,0 +1,7 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="srs-ingest" type="CMakeRunConfiguration" factoryName="Application" PROGRAM_PARAMS="-c conf/clion-ingest.conf" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" WORKING_DIR="file://$CMakeCurrentBuildDir$/../../../" PASS_PARENT_ENVS_2="true" PROJECT_NAME="srs" TARGET_NAME="srs" CONFIG_NAME="Debug" RUN_TARGET_PROJECT_NAME="srs" RUN_TARGET_NAME="srs">
+    <method v="2">
+      <option name="com.jetbrains.cidr.execution.CidrBuildBeforeRunTaskProvider$BuildBeforeRunTask" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/trunk/3rdparty/srs-bench/srs/rtc_test.go b/trunk/3rdparty/srs-bench/srs/rtc_test.go
index 941b1ccbe..4d2360120 100644
--- a/trunk/3rdparty/srs-bench/srs/rtc_test.go
+++ b/trunk/3rdparty/srs-bench/srs/rtc_test.go
@@ -25,11 +25,13 @@ import (
 	"encoding/json"
 	"fmt"
 	"github.com/pion/transport/vnet"
+	"github.com/pion/webrtc/v3"
 	"io"
 	"io/ioutil"
 	"math/rand"
 	"net/http"
 	"os"
+	"strings"
 	"sync"
 	"testing"
 	"time"
@@ -62,7 +64,7 @@ func TestMain(m *testing.M) {
 func TestPR2483_RtcStatApi_PublisherOnly(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("publish-only-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			return nil
 		})
@@ -96,11 +98,346 @@ func TestPR2483_RtcStatApi_PublisherOnly(t *testing.T) {
 	}
 }
 
+// Veirfy https://github.com/ossrs/srs/issues/2371
+func TestBugfix2371_PublishWithNack(t *testing.T) {
+	ctx, cancel := context.WithTimeout(logger.WithContext(context.Background()), time.Duration(*srsTimeout)*time.Millisecond)
+	if err := filterTestError(func() error {
+		streamSuffix := fmt.Sprintf("bugfix-2371-%v-%v", os.Getpid(), rand.Int())
+		p, err := newTestPublisher(registerMiniCodecs, func(p *testPublisher) error {
+			p.streamSuffix = streamSuffix
+			p.onOffer = func(s *webrtc.SessionDescription) error {
+				if n := strings.Count(s.SDP, "nack"); n != 2 {
+					return errors.Errorf("invalid %v nack", n)
+				}
+				return nil
+			}
+			p.onAnswer = func(s *webrtc.SessionDescription) error {
+				if n := strings.Count(s.SDP, "nack"); n != 2 {
+					return errors.Errorf("invalid %v nack", n)
+				}
+				cancel()
+				return nil
+			}
+			return nil
+		})
+		if err != nil {
+			return err
+		}
+		defer p.Close()
+
+		if err := p.Setup(*srsVnetClientIP); err != nil {
+			return err
+		}
+
+		return p.Run(ctx, cancel)
+	}()); err != nil {
+		t.Errorf("err %+v", err)
+	}
+}
+
+// Veirfy https://github.com/ossrs/srs/issues/2371
+func TestBugfix2371_PublishWithoutNack(t *testing.T) {
+	ctx, cancel := context.WithTimeout(logger.WithContext(context.Background()), time.Duration(*srsTimeout)*time.Millisecond)
+	if err := filterTestError(func() error {
+		streamSuffix := fmt.Sprintf("bugfix-2371-%v-%v", os.Getpid(), rand.Int())
+		p, err := newTestPublisher(registerMiniCodecsWithoutNack, func(p *testPublisher) error {
+			p.streamSuffix = streamSuffix
+			p.onOffer = func(s *webrtc.SessionDescription) error {
+				if n := strings.Count(s.SDP, "nack"); n != 0 {
+					return errors.Errorf("invalid %v nack", n)
+				}
+				return nil
+			}
+			p.onAnswer = func(s *webrtc.SessionDescription) error {
+				if n := strings.Count(s.SDP, "nack"); n != 0 {
+					return errors.Errorf("invalid %v nack", n)
+				}
+				cancel()
+				return nil
+			}
+			return nil
+		})
+		if err != nil {
+			return err
+		}
+		defer p.Close()
+
+		if err := p.Setup(*srsVnetClientIP); err != nil {
+			return err
+		}
+
+		return p.Run(ctx, cancel)
+	}()); err != nil {
+		t.Errorf("err %+v", err)
+	}
+}
+
+// Veirfy https://github.com/ossrs/srs/issues/2371
+func TestBugfix2371_PlayWithNack(t *testing.T) {
+	ctx := logger.WithContext(context.Background())
+	ctx, cancel := context.WithTimeout(ctx, time.Duration(*srsTimeout)*time.Millisecond)
+
+	var r0, r1, r2, r3 error
+	defer func(ctx context.Context) {
+		if err := filterTestError(ctx.Err(), r0, r1, r2, r3); err != nil {
+			t.Errorf("Fail for err %+v", err)
+		} else {
+			logger.Tf(ctx, "test done with err %+v", err)
+		}
+	}(ctx)
+
+	var resources []io.Closer
+	defer func() {
+		for _, resource := range resources {
+			_ = resource.Close()
+		}
+	}()
+
+	var wg sync.WaitGroup
+	defer wg.Wait()
+
+	// The event notify.
+	var thePublisher *testPublisher
+	var thePlayer *testPlayer
+
+	mainReady, mainReadyCancel := context.WithCancel(context.Background())
+	publishReady, publishReadyCancel := context.WithCancel(context.Background())
+
+	// Objects init.
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		doInit := func() (err error) {
+			streamSuffix := fmt.Sprintf("basic-publish-play-%v-%v", os.Getpid(), rand.Int())
+
+			// Initialize player with private api.
+			if thePlayer, err = newTestPlayer(registerMiniCodecs, func(play *testPlayer) error {
+				play.streamSuffix = streamSuffix
+				play.onOffer = func(s *webrtc.SessionDescription) error {
+					if n := strings.Count(s.SDP, "nack"); n != 2 {
+						return errors.Errorf("invalid %v nack", n)
+					}
+					return nil
+				}
+				play.onAnswer = func(s *webrtc.SessionDescription) error {
+					if n := strings.Count(s.SDP, "nack"); n != 2 {
+						return errors.Errorf("invalid %v nack", n)
+					}
+					cancel()
+					return nil
+				}
+				resources = append(resources, play)
+				return play.Setup(*srsVnetClientIP)
+			}); err != nil {
+				return err
+			}
+
+			// Initialize publisher with private api.
+			if thePublisher, err = newTestPublisher(registerMiniCodecs, func(pub *testPublisher) error {
+				pub.streamSuffix = streamSuffix
+				pub.iceReadyCancel = publishReadyCancel
+				resources = append(resources, pub)
+				return pub.Setup(*srsVnetClientIP)
+			}); err != nil {
+				return err
+			}
+
+			// Init done.
+			mainReadyCancel()
+
+			<-ctx.Done()
+			return nil
+		}
+
+		if err := doInit(); err != nil {
+			r1 = err
+		}
+	}()
+
+	// Run publisher.
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		select {
+		case <-ctx.Done():
+		case <-mainReady.Done():
+			r2 = thePublisher.Run(logger.WithContext(ctx), cancel)
+			logger.Tf(ctx, "pub done")
+		}
+	}()
+
+	// Run player.
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		select {
+		case <-ctx.Done():
+		case <-publishReady.Done():
+			r3 = thePlayer.Run(logger.WithContext(ctx), cancel)
+			logger.Tf(ctx, "play done")
+		}
+	}()
+}
+
+// Veirfy https://github.com/ossrs/srs/issues/2371
+func TestBugfix2371_PlayWithoutNack(t *testing.T) {
+	ctx := logger.WithContext(context.Background())
+	ctx, cancel := context.WithTimeout(ctx, time.Duration(*srsTimeout)*time.Millisecond)
+
+	var r0, r1, r2, r3 error
+	defer func(ctx context.Context) {
+		if err := filterTestError(ctx.Err(), r0, r1, r2, r3); err != nil {
+			t.Errorf("Fail for err %+v", err)
+		} else {
+			logger.Tf(ctx, "test done with err %+v", err)
+		}
+	}(ctx)
+
+	var resources []io.Closer
+	defer func() {
+		for _, resource := range resources {
+			_ = resource.Close()
+		}
+	}()
+
+	var wg sync.WaitGroup
+	defer wg.Wait()
+
+	// The event notify.
+	var thePublisher *testPublisher
+	var thePlayer *testPlayer
+
+	mainReady, mainReadyCancel := context.WithCancel(context.Background())
+	publishReady, publishReadyCancel := context.WithCancel(context.Background())
+
+	// Objects init.
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		doInit := func() (err error) {
+			streamSuffix := fmt.Sprintf("basic-publish-play-%v-%v", os.Getpid(), rand.Int())
+
+			// Initialize player with private api.
+			if thePlayer, err = newTestPlayer(registerMiniCodecsWithoutNack, func(play *testPlayer) error {
+				play.streamSuffix = streamSuffix
+				play.onOffer = func(s *webrtc.SessionDescription) error {
+					if n := strings.Count(s.SDP, "nack"); n != 0 {
+						return errors.Errorf("invalid %v nack", n)
+					}
+					return nil
+				}
+				play.onAnswer = func(s *webrtc.SessionDescription) error {
+					if n := strings.Count(s.SDP, "nack"); n != 0 {
+						return errors.Errorf("invalid %v nack", n)
+					}
+					cancel()
+					return nil
+				}
+				resources = append(resources, play)
+				return play.Setup(*srsVnetClientIP)
+			}); err != nil {
+				return err
+			}
+
+			// Initialize publisher with private api.
+			if thePublisher, err = newTestPublisher(registerMiniCodecs, func(pub *testPublisher) error {
+				pub.streamSuffix = streamSuffix
+				pub.iceReadyCancel = publishReadyCancel
+				resources = append(resources, pub)
+				return pub.Setup(*srsVnetClientIP)
+			}); err != nil {
+				return err
+			}
+
+			// Init done.
+			mainReadyCancel()
+
+			<-ctx.Done()
+			return nil
+		}
+
+		if err := doInit(); err != nil {
+			r1 = err
+		}
+	}()
+
+	// Run publisher.
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		select {
+		case <-ctx.Done():
+		case <-mainReady.Done():
+			r2 = thePublisher.Run(logger.WithContext(ctx), cancel)
+			logger.Tf(ctx, "pub done")
+		}
+	}()
+
+	// Run player.
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		defer cancel()
+
+		select {
+		case <-ctx.Done():
+		case <-publishReady.Done():
+			r3 = thePlayer.Run(logger.WithContext(ctx), cancel)
+			logger.Tf(ctx, "play done")
+		}
+	}()
+}
+
+// Veirfy https://github.com/ossrs/srs/issues/2371
+func TestBugfix2371_RTMP2RTC_PlayWithNack(t *testing.T) {
+	if err := filterTestError(func() error {
+		ctx, cancel := context.WithTimeout(logger.WithContext(context.Background()), time.Duration(*srsTimeout)*time.Millisecond)
+		p, err := newTestPlayer(registerMiniCodecs, func(play *testPlayer) error {
+			play.onOffer = func(s *webrtc.SessionDescription) error {
+				if n := strings.Count(s.SDP, "nack"); n != 2 {
+					return errors.Errorf("invalid %v nack", n)
+				}
+				return nil
+			}
+			play.onAnswer = func(s *webrtc.SessionDescription) error {
+				if n := strings.Count(s.SDP, "nack"); n != 2 {
+					return errors.Errorf("invalid %v nack", n)
+				}
+				cancel()
+				return nil
+			}
+			return nil
+		})
+		if err != nil {
+			return err
+		}
+		defer p.Close()
+
+		if err := p.Setup(*srsVnetClientIP); err != nil {
+			return err
+		}
+
+		return p.Run(ctx, cancel)
+	}()); err != nil {
+		t.Errorf("err %+v", err)
+	}
+}
+
 // Basic use scenario, publish a stream.
 func TestRtcBasic_PublishOnly(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("publish-only-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			return nil
 		})
@@ -187,7 +524,7 @@ func TestRtcBasic_PublishPlay(t *testing.T) {
 			streamSuffix := fmt.Sprintf("basic-publish-play-%v-%v", os.Getpid(), rand.Int())
 
 			// Initialize player with private api.
-			if thePlayer, err = newTestPlayer(createApiForPlayer, func(play *testPlayer) error {
+			if thePlayer, err = newTestPlayer(registerDefaultCodecs, func(play *testPlayer) error {
 				play.streamSuffix = streamSuffix
 				resources = append(resources, play)
 
@@ -221,7 +558,7 @@ func TestRtcBasic_PublishPlay(t *testing.T) {
 			}
 
 			// Initialize publisher with private api.
-			if thePublisher, err = newTestPublisher(createApiForPublisher, func(pub *testPublisher) error {
+			if thePublisher, err = newTestPublisher(registerDefaultCodecs, func(pub *testPublisher) error {
 				pub.streamSuffix = streamSuffix
 				pub.iceReadyCancel = publishReadyCancel
 				resources = append(resources, pub)
@@ -342,7 +679,7 @@ func TestRtcBasic_Republish(t *testing.T) {
 			streamSuffix := fmt.Sprintf("basic-publish-play-%v-%v", os.Getpid(), rand.Int())
 
 			// Initialize player with private api.
-			if thePlayer, err = newTestPlayer(createApiForPlayer, func(play *testPlayer) error {
+			if thePlayer, err = newTestPlayer(registerDefaultCodecs, func(play *testPlayer) error {
 				play.streamSuffix = streamSuffix
 				resources = append(resources, play)
 
@@ -368,7 +705,7 @@ func TestRtcBasic_Republish(t *testing.T) {
 			}
 
 			// Initialize publisher with private api.
-			if thePublisher, err = newTestPublisher(createApiForPublisher, func(pub *testPublisher) error {
+			if thePublisher, err = newTestPublisher(registerDefaultCodecs, func(pub *testPublisher) error {
 				pub.streamSuffix = streamSuffix
 				pub.iceReadyCancel = publishReadyCancel
 				resources = append(resources, pub)
@@ -391,7 +728,7 @@ func TestRtcBasic_Republish(t *testing.T) {
 			}
 
 			// Initialize re-publisher with private api.
-			if theRepublisher, err = newTestPublisher(createApiForPublisher, func(pub *testPublisher) error {
+			if theRepublisher, err = newTestPublisher(registerDefaultCodecs, func(pub *testPublisher) error {
 				pub.streamSuffix = streamSuffix
 				pub.iceReadyCancel = republishReadyCancel
 				resources = append(resources, pub)
@@ -457,7 +794,7 @@ func TestRtcBasic_Republish(t *testing.T) {
 func TestRtcDTLS_ClientActive_Default(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupActive
 			return nil
@@ -512,7 +849,7 @@ func TestRtcDTLS_ClientActive_Default(t *testing.T) {
 func TestRtcDTLS_ClientPassive_Default(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-active-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -564,7 +901,7 @@ func TestRtcDTLS_ClientPassive_Default(t *testing.T) {
 func TestRtcDTLS_ClientActive_Duplicated_Alert(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-active-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupActive
 			return nil
@@ -623,7 +960,7 @@ func TestRtcDTLS_ClientActive_Duplicated_Alert(t *testing.T) {
 func TestRtcDTLS_ClientPassive_Duplicated_Alert(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-active-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -689,7 +1026,7 @@ func TestRtcDTLS_ClientActive_ARQ_ClientHello_ByDropped_ClientHello(t *testing.T
 	var r0 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-active-arq-client-hello-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupActive
 			return nil
@@ -767,7 +1104,7 @@ func TestRtcDTLS_ClientPassive_ARQ_ClientHello_ByDropped_ClientHello(t *testing.
 	var r0 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-arq-client-hello-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -844,7 +1181,7 @@ func TestRtcDTLS_ClientActive_ARQ_ClientHello_ByDropped_ServerHello(t *testing.T
 	var r0, r1 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-active-arq-client-hello-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupActive
 			return nil
@@ -932,7 +1269,7 @@ func TestRtcDTLS_ClientPassive_ARQ_ClientHello_ByDropped_ServerHello(t *testing.
 	var r0, r1 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-arq-client-hello-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1017,7 +1354,7 @@ func TestRtcDTLS_ClientActive_ARQ_Certificate_ByDropped_Certificate(t *testing.T
 	var r0 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-active-arq-certificate-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupActive
 			return nil
@@ -1094,7 +1431,7 @@ func TestRtcDTLS_ClientPassive_ARQ_Certificate_ByDropped_Certificate(t *testing.
 	var r0 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-arq-certificate-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1171,7 +1508,7 @@ func TestRtcDTLS_ClientActive_ARQ_Certificate_ByDropped_ChangeCipherSpec(t *test
 	var r0, r1 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-active-arq-certificate-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupActive
 			return nil
@@ -1257,7 +1594,7 @@ func TestRtcDTLS_ClientPassive_ARQ_Certificate_ByDropped_ChangeCipherSpec(t *tes
 	var r0, r1 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-arq-certificate-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1334,7 +1671,7 @@ func TestRtcDTLS_ClientPassive_ARQ_Certificate_ByDropped_ChangeCipherSpec(t *tes
 func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_ClientHello(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1387,7 +1724,7 @@ func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_ClientHello(t *testing.T) {
 func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_ServerHello(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1440,7 +1777,7 @@ func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_ServerHello(t *testing.T) {
 func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_Certificate(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1493,7 +1830,7 @@ func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_Certificate(t *testing.T) {
 func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_ChangeCipherSpec(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1547,7 +1884,7 @@ func TestRtcDTLS_ClientPassive_ARQ_DropAllAfter_ChangeCipherSpec(t *testing.T) {
 func TestRtcDTLS_ClientPassive_ARQ_VeryBadNetwork(t *testing.T) {
 	if err := filterTestError(func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
@@ -1625,7 +1962,7 @@ func TestRtcDTLS_ClientPassive_ARQ_Certificate_After_ClientHello(t *testing.T) {
 	var r0 error
 	err := func() error {
 		streamSuffix := fmt.Sprintf("dtls-passive-no-arq-%v-%v", os.Getpid(), rand.Int())
-		p, err := newTestPublisher(createApiForPublisher, func(p *testPublisher) error {
+		p, err := newTestPublisher(registerDefaultCodecs, func(p *testPublisher) error {
 			p.streamSuffix = streamSuffix
 			p.onOffer = testUtilSetupPassive
 			return nil
diff --git a/trunk/3rdparty/srs-bench/srs/util.go b/trunk/3rdparty/srs-bench/srs/util.go
index ed8692523..eb88e8c95 100644
--- a/trunk/3rdparty/srs-bench/srs/util.go
+++ b/trunk/3rdparty/srs-bench/srs/util.go
@@ -59,6 +59,7 @@ var srsDTLSDropPackets *int
 var srsSchema string
 var srsServer *string
 var srsStream *string
+var srsLiveStream *string
 var srsPublishAudio *string
 var srsPublishVideo *string
 var srsVnetClientIP *string
@@ -68,7 +69,8 @@ func prepareTest() error {
 
 	srsHttps = flag.Bool("srs-https", false, "Whther connect to HTTPS-API")
 	srsServer = flag.String("srs-server", "127.0.0.1", "The RTC server to connect to")
-	srsStream = flag.String("srs-stream", "/rtc/regression", "The RTC stream to play")
+	srsStream = flag.String("srs-stream", "/rtc/regression", "The RTC app/stream to play")
+	srsLiveStream = flag.String("srs-live-stream", "/live/livestream", "The LIVE app/stream to play")
 	srsLog = flag.Bool("srs-log", false, "Whether enable the detail log")
 	srsTimeout = flag.Int("srs-timeout", 5000, "For each case, the timeout in ms")
 	srsPlayPLI = flag.Int("srs-play-pli", 5000, "The PLI interval in seconds for player.")
@@ -234,6 +236,11 @@ func (v *wallClock) Tick(d time.Duration) time.Duration {
 	return 0
 }
 
+// Do nothing for SDP.
+func testUtilPassBy(s *webrtc.SessionDescription) error {
+	return nil
+}
+
 // Set to active, as DTLS client, to start ClientHello.
 func testUtilSetupActive(s *webrtc.SessionDescription) error {
 	if strings.Contains(s.SDP, "setup:passive") {
@@ -548,6 +555,7 @@ func (v *dtlsRecord) Unmarshal(b []byte) error {
 	return nil
 }
 
+// The func to setup testWebRTCAPI
 type testWebRTCAPIOptionFunc func(api *testWebRTCAPI)
 
 type testWebRTCAPI struct {
@@ -566,25 +574,88 @@ type testWebRTCAPI struct {
 	proxy *vnet_proxy.UDPProxy
 }
 
-func newTestWebRTCAPI(options ...testWebRTCAPIOptionFunc) (*testWebRTCAPI, error) {
-	v := &testWebRTCAPI{}
+// The func to initialize testWebRTCAPI
+type testWebRTCAPIInitFunc func(api *testWebRTCAPI) error
+
+// Implements interface testWebRTCAPIInitFunc to init testWebRTCAPI
+func registerDefaultCodecs(api *testWebRTCAPI) error {
+	v := api
 
-	v.mediaEngine = &webrtc.MediaEngine{}
 	if err := v.mediaEngine.RegisterDefaultCodecs(); err != nil {
-		return nil, err
+		return err
 	}
 
-	v.registry = &interceptor.Registry{}
 	if err := webrtc.RegisterDefaultInterceptors(v.mediaEngine, v.registry); err != nil {
-		return nil, err
+		return err
 	}
 
-	for _, setup := range options {
-		setup(v)
+	return nil
+}
+
+// Implements interface testWebRTCAPIInitFunc to init testWebRTCAPI
+func registerMiniCodecs(api *testWebRTCAPI) error {
+	v := api
+
+	if err := v.mediaEngine.RegisterCodec(webrtc.RTPCodecParameters{
+		RTPCodecCapability: webrtc.RTPCodecCapability{webrtc.MimeTypeOpus, 48000, 2, "minptime=10;useinbandfec=1", nil},
+		PayloadType:        111,
+	}, webrtc.RTPCodecTypeAudio); err != nil {
+		return err
 	}
 
+	videoRTCPFeedback := []webrtc.RTCPFeedback{{"goog-remb", ""}, {"ccm", "fir"}, {"nack", ""}, {"nack", "pli"}}
+	if err := v.mediaEngine.RegisterCodec(webrtc.RTPCodecParameters{
+		RTPCodecCapability: webrtc.RTPCodecCapability{webrtc.MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f", videoRTCPFeedback},
+		PayloadType:        108,
+	}, webrtc.RTPCodecTypeVideo); err != nil {
+		return err
+	}
+
+	// Interceptors for NACK??? @see webrtc.ConfigureNack(v.mediaEngine, v.registry)
+	return nil
+}
+
+// Implements interface testWebRTCAPIInitFunc to init testWebRTCAPI
+func registerMiniCodecsWithoutNack(api *testWebRTCAPI) error {
+	v := api
+
+	if err := v.mediaEngine.RegisterCodec(webrtc.RTPCodecParameters{
+		RTPCodecCapability: webrtc.RTPCodecCapability{webrtc.MimeTypeOpus, 48000, 2, "minptime=10;useinbandfec=1", nil},
+		PayloadType:        111,
+	}, webrtc.RTPCodecTypeAudio); err != nil {
+		return err
+	}
+
+	videoRTCPFeedback := []webrtc.RTCPFeedback{{"goog-remb", ""}, {"ccm", "fir"}}
+	if err := v.mediaEngine.RegisterCodec(webrtc.RTPCodecParameters{
+		RTPCodecCapability: webrtc.RTPCodecCapability{webrtc.MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f", videoRTCPFeedback},
+		PayloadType:        108,
+	}, webrtc.RTPCodecTypeVideo); err != nil {
+		return err
+	}
+
+	// Interceptors for NACK??? @see webrtc.ConfigureNack(v.mediaEngine, v.registry)
+	return nil
+}
+
+func newTestWebRTCAPI(inits ...testWebRTCAPIInitFunc) (*testWebRTCAPI, error) {
+	v := &testWebRTCAPI{}
+
+	v.mediaEngine = &webrtc.MediaEngine{}
+	v.registry = &interceptor.Registry{}
 	v.settingEngine = &webrtc.SettingEngine{}
 
+	// Apply initialize filter, for example, register default codecs when create publisher/player.
+	for _, setup := range inits {
+		if setup == nil {
+			continue
+		}
+
+		if err := setup(v); err != nil {
+			return nil, err
+		}
+	}
+
 	return v, nil
 }
 
@@ -635,10 +706,12 @@ func (v *testWebRTCAPI) Setup(vnetClientIP string, options ...testWebRTCAPIOptio
 		return err
 	}
 
+	// Apply options from params, for example, tester to register vnet filter.
 	for _, setup := range options {
 		setup(v)
 	}
 
+	// Apply options in api, for example, publisher register audio-level interceptor.
 	for _, setup := range v.options {
 		setup(v)
 	}
@@ -659,26 +732,28 @@ func (v *testWebRTCAPI) NewPeerConnection(configuration webrtc.Configuration) (*
 type testPlayerOptionFunc func(p *testPlayer) error
 
 type testPlayer struct {
+	onOffer   func(s *webrtc.SessionDescription) error
+	onAnswer  func(s *webrtc.SessionDescription) error
 	pc        *webrtc.PeerConnection
 	receivers []*webrtc.RTPReceiver
 	// We should dispose it.
 	api *testWebRTCAPI
 	// Optional suffix for stream url.
 	streamSuffix string
+	// Optional app/stream to play, use srsStream by default.
+	defaultStream string
 }
 
-func createApiForPlayer(play *testPlayer) error {
-	api, err := newTestWebRTCAPI()
+// Create test player, the init is used to initialize api which maybe nil,
+// and the options is used to setup the player itself.
+func newTestPlayer(init testWebRTCAPIInitFunc, options ...testPlayerOptionFunc) (*testPlayer, error) {
+	v := &testPlayer{}
+
+	api, err := newTestWebRTCAPI(init)
 	if err != nil {
-		return err
+		return nil, err
 	}
-
-	play.api = api
-	return nil
-}
-
-func newTestPlayer(options ...testPlayerOptionFunc) (*testPlayer, error) {
-	v := &testPlayer{}
+	v.api = api
 
 	for _, opt := range options {
 		if err := opt(v); err != nil {
@@ -711,6 +786,9 @@ func (v *testPlayer) Close() error {
 
 func (v *testPlayer) Run(ctx context.Context, cancel context.CancelFunc) error {
 	r := fmt.Sprintf("%v://%v%v", srsSchema, *srsServer, *srsStream)
+	if v.defaultStream != "" {
+		r = fmt.Sprintf("%v://%v%v", srsSchema, *srsServer, v.defaultStream)
+	}
 	if v.streamSuffix != "" {
 		r = fmt.Sprintf("%v-%v", r, v.streamSuffix)
 	}
@@ -743,22 +821,35 @@ func (v *testPlayer) Run(ctx context.Context, cancel context.CancelFunc) error {
 		return errors.Wrapf(err, "Set offer %v", offer)
 	}
 
-	answer, err := apiRtcRequest(ctx, "/rtc/v1/play", r, offer.SDP)
+	if v.onOffer != nil {
+		if err := v.onOffer(&offer); err != nil {
+			return errors.Wrapf(err, "sdp %v %v", offer.Type, offer.SDP)
+		}
+	}
+
+	answerSDP, err := apiRtcRequest(ctx, "/rtc/v1/play", r, offer.SDP)
 	if err != nil {
 		return errors.Wrapf(err, "Api request offer=%v", offer.SDP)
 	}
 
 	// Run a proxy for real server and vnet.
-	if address, err := parseAddressOfCandidate(answer); err != nil {
-		return errors.Wrapf(err, "parse address of %v", answer)
+	if address, err := parseAddressOfCandidate(answerSDP); err != nil {
+		return errors.Wrapf(err, "parse address of %v", answerSDP)
 	} else if err := v.api.proxy.Proxy(v.api.network, address); err != nil {
 		return errors.Wrapf(err, "proxy %v to %v", v.api.network, address)
 	}
 
-	if err := pc.SetRemoteDescription(webrtc.SessionDescription{
-		Type: webrtc.SDPTypeAnswer, SDP: answer,
-	}); err != nil {
-		return errors.Wrapf(err, "Set answer %v", answer)
+	answer := &webrtc.SessionDescription{
+		Type: webrtc.SDPTypeAnswer, SDP: answerSDP,
+	}
+	if v.onAnswer != nil {
+		if err := v.onAnswer(answer); err != nil {
+			return errors.Wrapf(err, "on answerSDP")
+		}
+	}
+
+	if err := pc.SetRemoteDescription(*answer); err != nil {
+		return errors.Wrapf(err, "Set answerSDP %v", answerSDP)
 	}
 
 	handleTrack := func(ctx context.Context, track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) error {
@@ -830,21 +921,19 @@ type testPublisher struct {
 	cancel context.CancelFunc
 }
 
-func createApiForPublisher(pub *testPublisher) error {
-	api, err := newTestWebRTCAPI()
-	if err != nil {
-		return err
-	}
-
-	pub.api = api
-	return nil
-}
-
-func newTestPublisher(options ...testPublisherOptionFunc) (*testPublisher, error) {
+// Create test publisher, the init is used to initialize api which maybe nil,
+// and the options is used to setup the publisher itself.
+func newTestPublisher(init testWebRTCAPIInitFunc, options ...testPublisherOptionFunc) (*testPublisher, error) {
 	sourceVideo, sourceAudio := *srsPublishVideo, *srsPublishAudio
 
 	v := &testPublisher{}
 
+	api, err := newTestWebRTCAPI(init)
+	if err != nil {
+		return nil, err
+	}
+	v.api = api
+
 	for _, opt := range options {
 		if err := opt(v); err != nil {
 			return nil, err
@@ -860,7 +949,6 @@ func newTestPublisher(options ...testPublisherOptionFunc) (*testPublisher, error
 	}
 
 	// Setup the interceptors for packets.
-	api := v.api
 	api.options = append(api.options, func(api *testWebRTCAPI) {
 		// Filter for RTCP packets.
 		rtcpInterceptor := &rtcpInterceptor{}
diff --git a/trunk/conf/clion-ingest.conf b/trunk/conf/clion-ingest.conf
new file mode 100644
index 000000000..76fab5f41
--- /dev/null
+++ b/trunk/conf/clion-ingest.conf
@@ -0,0 +1,53 @@
+
+listen              1935;
+max_connections     1000;
+daemon              off;
+srs_log_tank        console;
+
+http_server {
+    enabled         on;
+    listen          8080;
+    dir             ./objs/nginx/html;
+}
+
+http_api {
+    enabled         on;
+    listen          1985;
+}
+stats {
+    network         0;
+}
+rtc_server {
+    enabled on;
+    # Listen at udp://8000
+    listen 8000;
+    #
+    # The $CANDIDATE means fetch from env, if not configed, use * as default.
+    #
+    # The * means retrieving server IP automatically, from all network interfaces,
+    # @see https://github.com/ossrs/srs/wiki/v4_CN_RTCWiki#config-candidate
+    candidate $CANDIDATE;
+}
+
+vhost __defaultVhost__ {
+    rtc {
+        enabled     on;
+    }
+    http_remux {
+        enabled     on;
+        mount       [vhost]/[app]/[stream].flv;
+    }
+    ingest livestream {
+        enabled on;
+        input {
+            type    file;
+            url     ./doc/source.200kbps.768x320.flv;
+        }
+        ffmpeg      ./objs/ffmpeg/bin/ffmpeg;
+        engine {
+            enabled          off;
+            output          rtmp://127.0.0.1:[port]/live/livestream;
+        }
+    }
+}
+
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 0fce6926b..775e1ece8 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -2909,7 +2909,7 @@ srs_error_t SrsRtcConnection::negotiate_publish_capability(SrsRtcUserConfig* ruc
             //local_media_desc.payload_types_.back().rtcp_fb_.push_back("rrtr");
         }
 
-        // TODO: FIXME: use one parse paylod from sdp.
+        // TODO: FIXME: use one parse payload from sdp.
 
         track_desc->create_auxiliary_payload(remote_media_desc.find_media_with_encoding_name("red"));
         track_desc->create_auxiliary_payload(remote_media_desc.find_media_with_encoding_name("rtx"));