Hi，大家好，我是一个爱冒泡的程序猿
在项目中发现EasyDarwin录屏有问题，让我们一起来看看吧

前言

EasyDarwin内部是使用FFmpeg进行分片，然后存储至本地，目前我将FFmpeg安装好，EasyDarwin搭建好，推流的时候，发现根本没存储至本地，存储目录生成了，但是.m3u8和.ts文件没有生成。
log.txt报错：Alternatively use the non experimental encoder ‘libfdk_aac’.
后找到原因，供大家参考

1、推流命令：

ffmpeg -re -i /data/test123.mp4 -vcodec libx264 -acodec copy -f rtsp -rtsp_transport tcp rtsp:/121.36.35.46/40851360cf284687974fec578c3dd5ae_摄像头 

2、存储目录log.xml报错

没有存储到服务器本地，存储时日志记录报错： ffmpeg version 2.8.15 Copyright (c) 2000-2018 the FFmpeg developers   built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)   configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --enable-libfdk-aac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect   libavutil      54. 31.100 / 54. 31.100   libavcodec     56. 60.100 / 56. 60.100   libavformat    56. 40.101 / 56. 40.101   libavdevice    56.  4.100 / 56.  4.100   libavfilter     5. 40.101 /  5. 40.101   libavresample   2.  1.  0 /  2.  1.  0   libswscale      3.  1.101 /  3.  1.101   libswresample   1.  2.101 /  1.  2.101   libpostproc    53.  3.100 / 53.  3.100 Input #0, rtsp, from 'rtsp://localhost:554/f5b60526bd3047caa62dceb939d14756_摄像头一':   Metadata:     title           : No Name   Duration: N/A, start: -2.574331, bitrate: N/A     Stream #0:0: Video: h264 (High), yuv420p, 540x960, 30 fps, 30 tbr, 90k tbn, 60 tbc     Stream #0:1: Audio: aac (LC), 44100 Hz, mono, fltp [aac @ 0x1c32560] The encoder 'aac' is experimental but experimental codecs are not enabled, add '-strict -2' if you want to use it. [aac @ 0x1c32560] Alternatively use the non experimental encoder 'libfdk_aac'. 

4、根据提示，修改源码

我们将EasyDarwin中 rtsp-server.go 中**Start()**方法进行修改
将原先：-c:a aac
改为：-c:a libfdk_aac

5、源码示例

func (server *Server) Start() (err error) {  logger := server.logger  addr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf(":%d", server.TCPPort)) if err != nil { return }  listener, err := net.ListenTCP("tcp", addr) if err != nil { return }   localRecord := utils.Conf().Section("rtsp").Key("save_stream_to_local").MustInt(0)  ffmpeg := utils.Conf().Section("rtsp").Key("ffmpeg_path").MustString("")  m3u8_dir_path := utils.Conf().Section("rtsp").Key("m3u8_dir_path").MustString("")  ts_duration_second := utils.Conf().Section("rtsp").Key("ts_duration_second").MustInt(6)  SaveStreamToLocal := false if (len(ffmpeg) > 0) && localRecord > 0 && len(m3u8_dir_path) > 0 {   err := utils.EnsureDir(m3u8_dir_path) if err != nil {    logger.Printf("Create m3u8_dir_path[%s] err:%v.", m3u8_dir_path, err) } else {    SaveStreamToLocal = true } } go func() { // save to local.   pusher2ffmpegMap := make(map[*Pusher]*exec.Cmd) if SaveStreamToLocal {    logger.Printf("Prepare to save stream to local....") defer logger.Printf("End save stream to local....") } var pusher *Pusher   addChnOk := true   removeChnOk := true for addChnOk || removeChnOk { select { case pusher, addChnOk = <-server.addPusherCh: if SaveStreamToLocal { if addChnOk {       dir := path.Join(m3u8_dir_path, pusher.Path(), time.Now().Format("20060102"))       err := utils.EnsureDir(dir) if err != nil {        logger.Printf("EnsureDir:[%s] err:%v.", dir, err) continue }       m3u8path := path.Join(dir, fmt.Sprintf("out.m3u8"))       port := pusher.Server().TCPPort       rtsp := fmt.Sprintf("rtsp://localhost:%d%s", port, pusher.Path())       paramStr := utils.Conf().Section("rtsp").Key(pusher.Path()).MustString("-c:v copy -c:a libfdk_aac")       params := []string{"-fflags", "genpts", "-rtsp_transport", "tcp", "-i", rtsp, "-hls_time", strconv.Itoa(ts_duration_second), "-hls_list_size", "0", m3u8path} if paramStr != "default" {        paramsOfThisPath := strings.Split(paramStr, " ")        params = append(params[:6], append(paramsOfThisPath, params[6:]...)...) } // ffmpeg -i ~/Downloads/720p.mp4 -s 640x360 -g 15 -c:a aac -hls_time 5 -hls_list_size 0 record.m3u8       cmd := exec.Command(ffmpeg, params...)       f, err := os.OpenFile(path.Join(dir, fmt.Sprintf("log.txt")), os.O_RDWR|os.O_CREATE, 0755) if err == nil {        cmd.Stdout = f        cmd.Stderr = f       }       err = cmd.Start() if err != nil {        logger.Printf("Start ffmpeg err:%v", err) }       pusher2ffmpegMap[pusher] = cmd       logger.Printf("add ffmpeg [%v] to pull stream from pusher[%v]", cmd, pusher) } else {       logger.Printf("addPusherChan closed") } } case pusher, removeChnOk = <-server.removePusherCh: if SaveStreamToLocal { if removeChnOk {       cmd := pusher2ffmpegMap[pusher]       proc := cmd.Process       if proc != nil {        logger.Printf("prepare to SIGTERM to process:%v", proc)        proc.Signal(syscall.SIGTERM)        proc.Wait() // proc.Kill() // no need to close attached log file. // see "Wait releases any resources associated with the Cmd." // if closer, ok := cmd.Stdout.(io.Closer); ok { //  closer.Close() //  logger.Printf("process:%v Stdout closed.", proc) // }        logger.Printf("process:%v terminate.", proc) } delete(pusher2ffmpegMap, pusher)       logger.Printf("delete ffmpeg from pull stream from pusher[%v]", pusher) } else { for _, cmd := range pusher2ffmpegMap {        proc := cmd.Process        if proc != nil {         logger.Printf("prepare to SIGTERM to process:%v", proc)         proc.Signal(syscall.SIGTERM) } }       pusher2ffmpegMap = make(map[*Pusher]*exec.Cmd)       logger.Printf("removePusherChan closed") } } } } }()   server.Stoped = false  server.TCPListener = listener  logger.Println("rtsp server start on", server.TCPPort)  networkBuffer := utils.Conf().Section("rtsp").Key("network_buffer").MustInt(1048576) for !server.Stoped {   conn, err := server.TCPListener.Accept() if err != nil {    logger.Println(err) continue } if tcpConn, ok := conn.(*net.TCPConn); ok { if err := tcpConn.SetReadBuffer(networkBuffer); err != nil {     logger.Printf("rtsp server conn set read buffer error, %v", err) } if err := tcpConn.SetWriteBuffer(networkBuffer); err != nil {     logger.Printf("rtsp server conn set write buffer error, %v", err) } }    session := NewSession(server, conn) go session.Start() } return } 

6、再次推流至流媒体，测验修改结果

7、查看下存储的录屏，yes！成功啦~

开心，问题解决啦~
掰掰~ 奔向阿里的第17天 ╰(°▽°)╯