diff --git a/trunk/auto/build_ffmpeg.sh b/trunk/auto/build_ffmpeg.sh
deleted file mode 100755
index 46fe24833..000000000
--- a/trunk/auto/build_ffmpeg.sh
+++ /dev/null
@@ -1,112 +0,0 @@
-#!/bin/bash
-
-ff_src_dir="../../3rdparty"
-
-# the jobs to make ffmpeg
-if [[ "" == $SRS_JOBS ]]; then 
-    export SRS_JOBS="--jobs=1" 
-fi
-
-ff_current_dir=$(pwd -P)
-ff_build_dir="${ff_current_dir}/_build"
-ff_release_dir="${ff_current_dir}/_release"
-echo "start to build the tools for transcode system:"
-echo "current_dir: ${ff_current_dir}"
-echo "build_dir: ${ff_build_dir}"
-echo "release_dir: ${ff_release_dir}"
-echo "SRS_JOBS: ${SRS_JOBS}"
-
-mkdir -p ${ff_build_dir}
-mkdir -p ${ff_release_dir}
-
-# yasm for libx264
-ff_yasm_bin=${ff_release_dir}/bin/yasm
-if [[ -f ${ff_yasm_bin} ]]; then 
-    echo "yasm is ok"
-else
-    echo "build yasm-1.2.0"
-    cd $ff_current_dir &&
-    rm -rf yasm-1.2.0 && unzip -q ${ff_src_dir}/yasm-1.2.0.zip &&
-    cd yasm-1.2.0 && ./configure --prefix=${ff_release_dir} &&
-    make && make install
-    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build yasm-1.2.0 failed"; exit 1; fi
-fi
-# add yasm to path, for x264 to use yasm directly.
-# ffmpeg can specifies the yasm path when configure it.
-export PATH=${PATH}:${ff_release_dir}/bin
-
-# libfdk-aac
-if [[ -f ${ff_release_dir}/lib/libfdk-aac.a ]]; then
-    echo "libfdk_aac is ok"
-else
-    echo "build fdk-aac-0.1.3"
-    cd $ff_current_dir &&
-    rm -rf fdk-aac-0.1.3 && unzip -q ${ff_src_dir}/fdk-aac-0.1.3.zip &&
-    cd fdk-aac-0.1.3 && bash autogen.sh && ./configure --prefix=${ff_release_dir} --enable-static && make ${SRS_JOBS} && make install
-    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build fdk-aac-0.1.3 failed"; exit 1; fi
-fi
-
-# lame-3.99
-if [[ -f ${ff_release_dir}/lib/libmp3lame.a ]]; then
-    echo "libmp3lame is ok"
-else
-    echo "build lame-3.99.5"
-    cd $ff_current_dir &&
-    rm -rf lame-3.99.5 && unzip -q ${ff_src_dir}/lame-3.99.5.zip &&
-    cd lame-3.99.5 && ./configure --prefix=${ff_release_dir} --enable-static && make ${SRS_JOBS} && make install
-    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build lame-3.99.5 failed"; exit 1; fi
-fi
-
-# speex-1.2rc1
-if [[ -f ${ff_release_dir}/lib/libspeex.a ]]; then
-    echo "libspeex is ok"
-else
-    echo "build speex-1.2rc1"
-    cd $ff_current_dir &&
-    rm -rf speex-1.2rc1 && unzip -q ${ff_src_dir}/speex-1.2rc1.zip &&
-    cd speex-1.2rc1 && ./configure --prefix=${ff_release_dir} --enable-static && make ${SRS_JOBS} && make install
-    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build speex-1.2rc1 failed"; exit 1; fi
-fi
-
-# x264 core.157
-if [[ -f ${ff_release_dir}/lib/libx264.a ]]; then
-    echo "x264 is ok"
-else
-    echo "build x264"
-    cd $ff_current_dir &&
-    rm -rf x264-snapshot-20181116-2245 && unzip -q ${ff_src_dir}/x264-snapshot-20181116-2245.zip &&
-    cd x264-snapshot-20181116-2245 && 
-    ./configure --prefix=${ff_release_dir} --disable-opencl --bit-depth=all \
-        --enable-static --disable-avs  --disable-swscale  --disable-lavf \
-        --disable-ffms  --disable-gpac --disable-cli && 
-    make ${SRS_JOBS} && make install
-    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build x264 failed"; exit 1; fi
-fi
-
-# ffmpeg-4.1
-if [[ -f ${ff_release_dir}/bin/ffmpeg ]]; then
-    echo "ffmpeg-4.1 is ok"
-else
-    echo "build ffmpeg-4.1"
-    cd $ff_current_dir &&
-    rm -rf ffmpeg-4.1 && unzip -q ${ff_src_dir}/ffmpeg-4.1.zip &&
-    echo "remove all so to force the ffmpeg to build in static" &&
-    rm -f ${ff_release_dir}/lib/*.so* &&
-    echo "export the dir to enable the build command canbe use." &&
-    export ffmpeg_exported_release_dir=${ff_release_dir} &&
-    cd ffmpeg-4.1 && 
-    ./configure \
-        --enable-gpl --enable-nonfree \
-        --yasmexe=${ff_yasm_bin} \
-        --prefix=${ff_release_dir} --cc= \
-        --enable-static --disable-shared --disable-debug \
-        --extra-cflags='-I${ffmpeg_exported_release_dir}/include' \
-        --extra-ldflags='-L${ffmpeg_exported_release_dir}/lib -lm -ldl' \
-        --disable-ffplay --disable-ffprobe --disable-doc \
-        --enable-postproc --enable-bzlib --enable-zlib --enable-parsers \
-        --enable-libx264 --enable-libmp3lame --enable-libfdk-aac --enable-libspeex \
-        --enable-pthreads --extra-libs=-lpthread \
-        --enable-encoders --enable-decoders --enable-avfilter --enable-muxers --enable-demuxers && 
-    make ${SRS_JOBS} && make install
-    ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build ffmpeg failed"; exit 1; fi
-fi
diff --git a/trunk/src/app/srs_app_rtc_source.cpp b/trunk/src/app/srs_app_rtc_source.cpp
index 0af4eefd7..11a57bca5 100644
--- a/trunk/src/app/srs_app_rtc_source.cpp
+++ b/trunk/src/app/srs_app_rtc_source.cpp
@@ -763,7 +763,7 @@ srs_error_t SrsRtcFromRtmpBridger::package_stap_a(SrsRtcSource* source, SrsShare
     }
 
     *ppkt = pkt;
-    srs_trace("RTC STAP-A seq=%u, sps %d, pps %d bytes", pkt->header.get_sequence(), sps.size(), pps.size());
+    srs_info("RTC STAP-A seq=%u, sps %d, pps %d bytes", pkt->header.get_sequence(), sps.size(), pps.size());
 
     return err;
 }