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• avformat/hls : Factor playlist need check to a common function

  19 novembre 2017, par Anssi Hannula

  avformat/hls : Factor playlist need check to a common function
  

  • [DH] libavformat/hls.c

• xtea : Clarify that the current API works in big endian mode

  11 novembre 2015, par Martin Storsjö

  xtea : Clarify that the current API works in big endian mode
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavutil/xtea.h

• WriteToUDP only works on same machine

  26 mai 2017, par Anderson Scouto da Silva

  This script is intended to capture the output of ffmpeg and write to a UDP address.

  It works correctly as I open the VLC 233.10.10.13:1234 and runs normally, but out of this computer the stream is not played, it’s as if the stream does not exit from the machine to the multicast network, but on the same PC it works normally, I run the script go and open the VLC to run, it works perfectly.

  To take the doubts that might be some problem in the interfaces, I made a VLC stream by capturing 233.1.1.13:1234 and exiting to 233.10.10.13:1234 and I can run anywhere outside the machine where VLC is, for example, in another VLC on another machine. It just does not work in the script I wrote on go.

  Can anyone help ?

  package main
  
  
  
  import (
  
      "os/exec"
  
      "io"
  
      "strings"
  
      "net"
  
      "net/url"
  
      "os"
  
      "github.com/juju/loggo"
  
  )
  
  
  
  const (
  
      BUFFER = 40 * 1024
  
      DEBUG = true
  
  )
  
  
  
  func verificaErro(e error) {
  
      if e != nil {
  
          logger.Errorf(e.Error())
  
      }
  
  }
  
  
  
  var logger loggo.Logger
  
  
  
  
  
  func main() {
  
      initLogger()
  
  
  
      dir, _ := os.Getwd()
  
  
  
      // conexão UDP
  
      conn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
  
      verificaErro(err)
  
      err = conn.SetWriteBuffer(BUFFER)
  
      verificaErro(err)
  
  
  
      inputSource := dir + "/in/teste-4k.mp4"
  
      inputSource = normalizeInputSource(inputSource)
  
  
  
      inputCodec := probeInputCodec(inputSource)
  
      outputCodec := probeOutputCodec(inputCodec)
  
  
  
      cmdName := "ffmpeg"
  
      argsPipe1 := []string{
  
          "-hide_banner",
  
          "-loglevel", "panic",
  
          "-re",
  
          "-i",
  
          inputSource,
  
          "-preset",
  
          "superfast",
  
          "-c:v",
  
          inputCodec,
  
          "-crf",
  
          "0",
  
          "-c",
  
          "copy",
  
          "-f", outputCodec, "pipe:1",
  
      }
  
  
  
      cmdPipe1 := exec.Command(cmdName, argsPipe1...)
  
  
  
      logger.Debugf(strings.Join(argsPipe1, " "))
  
  
  
      stdoutPipe1, err := cmdPipe1.StdoutPipe()
  
      verificaErro(err)
  
      err2 := cmdPipe1.Start()
  
      verificaErro(err2)
  
  
  
      chunk := make([]byte, BUFFER)
  
      for {
  
          nr, err5 := stdoutPipe1.Read(chunk)
  
          logger.Debugf("Lido %d bytes\n", nr)
  
  
  
          if nr > 0 {
  
              validData := chunk[:nr]
  
  
  
              nw, err6 := conn.WriteToUDP(validData, &net.UDPAddr{IP: net.IP{233, 10, 10, 13}, Port: 1234})
  
              logger.Debugf("Escrito %d bytes\n", nw)
  
              verificaErro(err6)
  
          }
  
  
  
          if err5 != nil {
  
              // fim do arquivo
  
              if err5 == io.EOF {
  
                  break
  
              }
  
              logger.Errorf("Erro = %v\n", err5)
  
              continue
  
          }
  
      }
  
  }
  
  
  
  func probeInputCodec(input string) string {
  
      cmdName := "ffprobe"
  
      args := []string{
  
          "-v", "error",
  
          "-select_streams", "v:0", "-show_entries",
  
          "stream=codec_name", "-of", "default=noprint_wrappers=1:nokey=1",
  
          input,
  
      }
  
  
  
      out, err := exec.Command(cmdName, args...).Output()
  
      verificaErro(err)
  
  
  
      return strings.TrimSpace(string(out))
  
  
  
  }
  
  
  
  func probeOutputCodec(inputCode string) string {
  
      switch inputCode {
  
      case "h264":
  
          return "mpegts"
  
      case "mpeg4":
  
          return "mpeg4"
  
      }
  
  
  
      return "mpegts"
  
  }
  
  
  
  func normalizeInputSource(inputSource string) (string) {
  
      isFile := false
  
      if _, err := os.Stat(inputSource); err == nil {
  
          isFile = true
  
      }
  
      if isFile {
  
          return inputSource
  
      }
  
  
  
      u, err := url.Parse(inputSource)
  
      verificaErro(err)
  
  
  
      if u.Scheme != "udp" && u.Scheme != "tcp" {
  
          errorMessage := "A entrada deve ser uma URL UDP/TCP ou um arquivo existente"
  
          logger.Errorf(errorMessage)
  
          os.Exit(1)
  
      }
  
  
  
      q := u.Query()
  
  
  
      if u.Scheme == "udp" {
  
          q.Set("overrun_nonfatal", "1")
  
          q.Set("fifo_size", "1000000")
  
          q.Set("buffer_size", "26214400")
  
      }
  
  
  
      u.RawQuery = q.Encode()
  
  
  
      return u.String()
  
  }
  
  
  
  func initLogger() {
  
      logger = loggo.GetLogger(loggo.DefaultWriterName)
  
      if DEBUG {
  
          logger.SetLogLevel(loggo.DEBUG)
  
      } else {
  
          logger.SetLogLevel(loggo.ERROR)
  
      }
  
  }