解決EasyDarwin中錄屏存儲失敗問題，存儲目錄log.txt報錯

Hi，大家好，我是一個愛冒泡的程序猿
在項目中發現EasyDarwin錄屏有問題，讓我們一起來看看吧

前言

EasyDarwin內部是使用FFmpeg進行分片，然後存儲至本地，目前我將FFmpeg安裝好，EasyDarwin搭建好，推流的時候，發現根本沒存儲至本地，存儲目錄生成了，但是.m3u8和.ts文件沒有生成。
log.txt報錯：Alternatively use the non experimental encoder ‘libfdk_aac’.
後找到原因，供大家參考

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_攝像頭

2、存儲目錄log.xml報錯

沒有存儲到服務器本地，存儲時日誌記錄報錯：
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_攝像頭一':
  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、根據提示，修改源碼

我們將EasyDarwin中 rtsp-server.go 中**Start()**方法進行修改
將原先：-c:a aac
改爲：-c:a libfdk_aac

5、源碼示例

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、再次推流至流媒體，測驗修改結果

7、查看下存儲的錄屏，yes！成功啦~

開心，問題解決啦~
掰掰~ 奔向阿里的第17天 ╰(°▽°)╯