javascript - 使用 Node 的 ffmpeg 应用程序偶尔会崩溃，因为文件似乎没有被正确读取

Question

我有一个简单的 Node 应用程序，它允许我将 AWS S3 URL 链接传递给文件(在本例中为视频文件)。它使用 FFMPEG 库读取视频文件并返回编解码器、持续时间、比特率等数据。
该脚本是从 PHP 脚本调用的，该脚本又将数据发送到 Node 端点并将 Amazon S3 URL 传递给 Node 。有时，由于没有明显的原因，视频文件无法返回有关容器、编解码器、持续时间等的预期值......并且只返回“0”。但是当我再次尝试完全相同的文件/请求时，它会正确返回此数据，例如 container:mp4我不确定，但我认为脚本在某种程度上需要 createWriteStream关闭，但我不能确定，问题是我发现的问题并不是一直发生，而是偶尔发生，所以当它难以复制时，很难解决这个问题。
有任何想法吗？

router.post('/', async function(req, res) {
  const fileURL = new URL(req.body.file);
  var path = fileURL.pathname;
  path = 'tmp/'+path.substring(1);    // removes the initial / from the path

  let file = fs.createWriteStream(path);  // create the file locally
  const request = https.get(fileURL, function(response) {
    response.pipe(file);
  });
  
  // after file has saved
  file.on('finish', function () {
    var process = new ffmpeg(path);
    process.then(function (video) {
      let metadata = formatMetadata(video.metadata);

      res.send ({
        status: '200',
        data: metadata,
        errors: errors,
        response: 'success'
      });

    }, function (err) {
      console.warn('Error: ' + err);

      res.send ({
        status: '400',
        data: 'Something went wrong processing this video',
        response: 'fail',
      });
    });
  });

  file.on('error', function (err) {
    console.warn(err);
  });

});

function formatMetadata(metadata) {
  const data = {
    'video' : metadata.video,
    'audio' : metadata.audio,
    'duration' : metadata.duration
  };
  return data;
}

//预期输出

{"data":{"video":{"container":"mov","bitrate":400,"stream":0,"codec":"h264","resolution":{"w":1280,"h":720},"resolutionSquare":{"w":1280,"h":720},"aspect":{"x":16,"y":9,"string":"16:9","value":1.7777777777777777},"rotate":0,"fps":25,"pixelString":"1:1","pixel":1},"audio":{"codec":"aac","bitrate":"127","sample_rate":44100,"stream":0,"channels":{"raw":"stereo","value":2}},"duration":{"raw":"00:00:25.68","seconds":25}}

//实际输出

{"data":{"video":{"container":"","bitrate":0,"stream":0,"codec":"","resolution":{"w":0,"h":0},"resolutionSquare":{"w":0,"h":null},"aspect":{},"rotate":0,"fps":0,"pixelString":"","pixel":0},"audio":{"codec":"","bitrate":"","sample_rate":0,"stream":0,"channels":{"raw":"","value":""}},"duration":{"raw":"","seconds":0}}

注意 - 这偶尔会发生

Answer 1

您没有考虑从 AWS 获取失败的原因。在继续使用管道之前，您应该检查响应的状态代码。

  const request = https.get(fileURL, function(response) {
    if(response.statusCode == 200) 
      response.pipe(file);
    else
      // Handle error case
  });