diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6ea5e3c1f..53a114a6c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -198,7 +198,7 @@ jobs:
       - name: Run SRS regression-test
         run: |
           docker run --rm srs:test bash -c './objs/srs -c conf/regression-test.conf && \
-              cd 3rdparty/srs-bench && (./objs/srs_test -test.v || (cat ../../objs/srs.log && exit 1)) && \
+              cd 3rdparty/srs-bench && (./objs/srs_test -test.v || (cat ../../objs/srs.log && exit 1)) && cat ../../objs/srs.log && \
               ./objs/srs_gb28181_test -test.v'
     runs-on: ubuntu-20.04
 
diff --git a/trunk/3rdparty/srs-bench/srs/rtmp_test.go b/trunk/3rdparty/srs-bench/srs/rtmp_test.go
index 7dd39597f..798db65da 100644
--- a/trunk/3rdparty/srs-bench/srs/rtmp_test.go
+++ b/trunk/3rdparty/srs-bench/srs/rtmp_test.go
@@ -24,7 +24,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"github.com/pkg/errors"
 	"math/rand"
 	"os"
 	"sync"
@@ -36,6 +35,7 @@ import (
 	"github.com/ossrs/go-oryx-lib/logger"
 	"github.com/ossrs/go-oryx-lib/rtmp"
 	"github.com/pion/interceptor"
+	"github.com/pkg/errors"
 )
 
 func TestRtmpPublishPlay(t *testing.T) {
@@ -623,7 +623,10 @@ func TestRtmpPublish_HttpFlvPlayNoVideo(t *testing.T) {
 		go func() {
 			defer wg.Done()
 			publisher.onSendPacket = func(m *rtmp.Message) error {
-				time.Sleep(1 * time.Millisecond)
+				// Note that must greater than the cost of ffmpeg-opus, which is about 4ms, otherwise,
+				// the publisher will always get audio frames to transcode and won't accept new players
+				// connection and finally failed the case.
+				time.Sleep(5 * time.Millisecond)
 				return nil
 			}
 			if r0 = publisher.Ingest(ctx, *srsPublishAvatar); r0 != nil {
diff --git a/trunk/Dockerfile.test b/trunk/Dockerfile.test
index 8b0bde656..30222976b 100644
--- a/trunk/Dockerfile.test
+++ b/trunk/Dockerfile.test
@@ -16,7 +16,8 @@ COPY . /srs
 WORKDIR /srs/trunk
 
 # Note that we must enable the gcc7 or link failed.
-RUN ./configure --srt=on --gb28181=on --srt=on --gb28181=on --apm=on --h265=on --utest=on
+# Note that we must disable the build-cache, or it will failed, but donot know why.
+RUN ./configure --srt=on --gb28181=on --srt=on --apm=on --h265=on --utest=on --ffmpeg-opus=off --build-cache=on
 RUN make utest ${MAKEARGS}
 
 # Build benchmark tool.
diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 108747bfe..ef879547e 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -37,6 +37,7 @@ SRS_FFMPEG_TOOL=NO
 # FFmpeg fit is the source code for RTC, to transcode audio or video in SRS.
 SRS_FFMPEG_FIT=RESERVED
 # Whether use FFmpeg native opus codec for RTC. If not, use libopus instead.
+# Should disable it by default, because the cost of it is very high, see https://github.com/ossrs/srs/pull/3868
 SRS_FFMPEG_OPUS=NO
 # arguments
 SRS_PREFIX=/usr/local/srs
diff --git a/trunk/doc/CHANGELOG.md b/trunk/doc/CHANGELOG.md
index 17a260ac5..39f05fc6d 100644
--- a/trunk/doc/CHANGELOG.md
+++ b/trunk/doc/CHANGELOG.md
@@ -7,6 +7,7 @@ The changelog for SRS.
 <a name="v6-changes"></a>
 
 ## SRS 6.0 Changelog
+* v6.0, 2023-11-16, Merge [#3868](https://github.com/ossrs/srs/pull/3868): Fix the test fail when enable ffmpeg-opus. v6.0.100 (#3868)
 * v6.0, 2023-11-15, Merge [#3879](https://github.com/ossrs/srs/pull/3879): Add --extra-ldflags. v6.0.99 (#3879)
 * v6.0, 2023-11-06, Merge [#3851](https://github.com/ossrs/srs/pull/3851): donot compile libopus when enable sys-ffmpeg. v6.0.98 (#3851)
 * v6.0, 2023-11-04, Merge [#3852](https://github.com/ossrs/srs/pull/3852): RTC: Refine FFmpeg opus audio noisy issue. v6.0.97 (#3852)
diff --git a/trunk/ide/srs_clion/CMakeLists.txt b/trunk/ide/srs_clion/CMakeLists.txt
index deb36a5df..3c496eeaa 100755
--- a/trunk/ide/srs_clion/CMakeLists.txt
+++ b/trunk/ide/srs_clion/CMakeLists.txt
@@ -27,11 +27,11 @@ ProcessorCount(JOBS)
 # We should always configure SRS for switching between branches.
 IF (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
     EXECUTE_PROCESS(
-        COMMAND ./configure --osx --srt=on --gb28181=on --apm=on --h265=on --utest=on --jobs=${JOBS}
+        COMMAND ./configure --osx --srt=on --gb28181=on --apm=on --h265=on --utest=on --ffmpeg-opus=off --jobs=${JOBS}
         WORKING_DIRECTORY ${SRS_DIR} RESULT_VARIABLE ret)
 ELSE ()
     EXECUTE_PROCESS(
-        COMMAND ./configure --srt=on --gb28181=on --apm=on --h265=on --utest=on --jobs=${JOBS}
+        COMMAND ./configure --srt=on --gb28181=on --apm=on --h265=on --utest=on --ffmpeg-opus=off --jobs=${JOBS}
         WORKING_DIRECTORY ${SRS_DIR} RESULT_VARIABLE ret)
 ENDIF ()
 if(NOT ret EQUAL 0)
diff --git a/trunk/src/app/srs_app_rtc_codec.cpp b/trunk/src/app/srs_app_rtc_codec.cpp
index bdf1b5312..a73b6f2bc 100644
--- a/trunk/src/app/srs_app_rtc_codec.cpp
+++ b/trunk/src/app/srs_app_rtc_codec.cpp
@@ -247,6 +247,10 @@ srs_error_t SrsAudioTranscoder::init_enc(SrsAudioCodecId dst_codec, int dst_chan
         //TODO: for more level setting
         enc_->compression_level = 1;
         enc_->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
+
+#ifdef SRS_FFMPEG_OPUS
+        av_opt_set(enc_->priv_data, "opus_delay", "2.5", 0);
+#endif
     } else if (dst_codec == SrsAudioCodecIdAAC) {
         enc_->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
     }
diff --git a/trunk/src/core/srs_core_version6.hpp b/trunk/src/core/srs_core_version6.hpp
index 892842229..9fa9829b3 100644
--- a/trunk/src/core/srs_core_version6.hpp
+++ b/trunk/src/core/srs_core_version6.hpp
@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       6
 #define VERSION_MINOR       0
-#define VERSION_REVISION    99
+#define VERSION_REVISION    100
 
 #endif