如何使用ffmpeg通过媒体记录器api从块创建视频文件webm

如何解决如何使用ffmpeg通过媒体记录器api从块创建视频文件webm

我正在尝试使用FFMPEG在NodeJS服务器中由MediaRecorderAPI生成的blob创建一个webm视频文件。我可以创建 .webm 文件，但是无法播放，我运行了该命令$ ffmpeg.exe -v error -i lel.webm -f null - >error.log 2>&1 来生成错误日志，该错误日志文件包含以下内容：

[null @ 000002ce7501de40]应用程序向流0：1中的复用器提供了无效且非单调递增的dts

[h264 @ 000002ce74a727c0]无效的NAL单位大小（804> 74）。

[h264 @ 000002ce74a727c0]将输入拆分为NAL单元时出错。

解码流＃0：0时出错：处理输入时发现无效数据

这是我的Web服务器代码

const app = require("express")();
const http = require("http").createServer(app);
const io = require("socket.io")(http);
const fs = require("fs");
const child_process = require("child_process");

app.get("/",(req,res) => {
  res.sendFile(__dirname + "/index.html");
});

io.on("connection",(socket) => {
  console.log("a user connected");

  const ffmpeg = child_process.spawn("ffmpeg",[
    "-i","-","-vcodec","copy","-f","flv","rtmpUrl.webm",]);

  ffmpeg.on("close",(code,signal) => {
    console.log(
      "FFmpeg child process closed,code " + code + ",signal " + signal
    );
  });

  ffmpeg.stdin.on("error",(e) => {
    console.log("FFmpeg STDIN Error",e);
  });

  ffmpeg.stderr.on("data",(data) => {
    console.log("FFmpeg STDERR:",data.toString());
  });

  socket.on("message",(msg) => {
    console.log("Writing blob! ");
    ffmpeg.stdin.write(msg);
  });

  socket.on("stop",() => {
    console.log("Stop recording..");
    ffmpeg.kill("SIGINT");
  });
});

http.listen(3000,() => {
  console.log("listening on *:3000");
});

这是我的客户端代码，使用HTML，JS：

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
    <title>Document</title>
  </head>
  <script src="/socket.io/socket.io.js"></script>
  <script>
    const socket = io();
    let mediaRecorder = null;
    const startRecording = (someStream) => {
      const mediaStream = new MediaStream();
      const videoTrack = someStream.getVideoTracks()[0];
      const audioTrack = someStream.getAudioTracks()[0];
      console.log("Video trac ",videoTrack);
      console.log("audio trac ",audioTrack);
      mediaStream.addTrack(videoTrack);
      mediaStream.addTrack(audioTrack);

      const recorderOptions = {
        mimeType: "video/webm;codecs=h264",videoBitsPerSecond: 3 * 1024 * 1024,};

      mediaRecorder = new MediaRecorder(mediaStream,recorderOptions);
      mediaRecorder.start(1000); // 1000 - the number of milliseconds to record into each Blob
      mediaRecorder.ondataavailable = (event) => {
        console.debug("Got blob data:",event.data);
        if (event.data && event.data.size > 0) {
          socket.emit("message",event.data);
        }
      };
    };

    const getVideoStream = async () => {
      try {
        const stream = await navigator.mediaDevices.getUserMedia({
          video: true,audio: true,});
        startRecording(stream);
        myVideo.srcObject = stream;
      } catch (e) {
        console.error("navigator.getUserMedia error:",e);
      }
    };

    const stopRecording = () => {
      mediaRecorder.stop();
      socket.emit("stop");
    };
  </script>
  <body>
    <p>hello world</p>
    <button onclick="getVideoStream()">start rec</button>
    <button onclick="stopRecording()">stop rec</button>

    <video width="300" height="300" autoplay id="myvideo" />
    <script>
      const myVideo = document.getElementById("myvideo");
      myVideo.muted = true;
    </script>
  </body>
</html>

感谢您的帮助！

解决方法

看起来您正在编码为flv，而不是webm。因此，您已经在webm容器中进行了flv编码的视频-播放设备根本不知道该怎么处理：）

仅在计算机上的mp4上尝试上述命令-我敢打赌，它将无法正常工作。要编码为webm，请检查以下ffmpeg commands

如何使用ffmpeg通过媒体记录器api从块创建视频文件webm

如何解决如何使用ffmpeg通过媒体记录器api从块创建视频文件webm

解决方法

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