Javascript Node.js子进程类型错误：无法读取属性'_可写状态'；未定义的

我试图使用

child_进程

库将ffmpeg的一部分功能包装到Node.js API中，但是当我试图将任何数据发送到ffmpeg的stdin管道时，我得到一个错误

TypeError:Cannot read undefined

的属性'\u writeablestate'

import {spawn} from "child_process"

export default frames => {
    // Spawn ffmpeg process
    const ffmpeg = spawn("ffmpeg", ["-f", "image2pipe", "-i", "-", "output.mkv"])
    // Send frames to ffmpeg as stdin
    frames.forEach(ffmpeg.stdin.write)

    // Listen for output and errors
    return new Promise((resolve, reject) => {
        const chunks = []

        ffmpeg.stdout.on("data", chunks.push)
        ffmpeg.stderr.on("data", reject(data))
        ffmpeg.on("close", code =>
            resolve(Buffer.concat(chunks))
        )
    })
}

错误：

TypeError: Cannot read property '_writableState' of undefined
    at Writable.write (_stream_writable.js:270:20)
    at Array.forEach (<anonymous>)
    at exports.default (/home/fiendfan1/workspace/nodejs/declare/dist/app/common/encodeVideo.js:21:12)
    at _callee$ (/home/fiendfan1/workspace/nodejs/declare/dist/app/tests/video.js:34:84)
    at tryCatch (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:117:21)
    at Generator.tryCatcher (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/generators.js:97:49)
    at Promise._settlePromise (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:574:26)
    at Promise._settlePromise0 (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:693:18)
    at Async._drainQueue (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues [as _onImmediate] (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:696:18)

TypeError:无法读取未定义的属性“\u writableState”
在Writable.write（_stream_Writable.js:270:20）
在Array.forEach（）处
在exports.default（/home/fiendfan1/workspace/nodejs/declare/dist/app/common/encodeVideo.js:21:12）
在_callee$（/home/fiendfan1/workspace/nodejs/declare/dist/app/tests/video.js:34:84）
在tryCatch（/home/fiendfan1/workspace/nodejs/declare/node_modules/registrator runtime/runtime.js:65:40）
在Generator.invoke[as _invoke]（/home/fiendfan1/workspace/nodejs/declare/node_modules/registrator runtime/runtime.js:303:22）
在Generator.prototype.（匿名函数）[as next]（/home/fiendfan1/workspace/nodejs/declare/node_modules/registrator runtime/runtime.js:117:21）
在Generator.tryCatcher（/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/util.js:16:23）
在PromiseSpawn._promiseCompleted（/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/generators.js:97:49）
在Promise._结算Promise（/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/Promise.js:574:26）
在Promise._settlePromise0（/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/Promise.js:614:10）
在Promise._结算Promises（/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/Promise.js:693:18）
在Async.\u drainQueue（/home/fiendfan1/workspace/nodejs/declare/node\u modules/bluebird/js/release/Async.js:133:16）
在Async.\u drainQueues（/home/fiendfan1/workspace/nodejs/declare/node\u modules/bluebird/js/release/Async.js:143:10）
在Immediate.Async.drainQueues[as _onImmediate]（/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/Async.js:17:14）
运行回调时（timers.js:696:18）

这里的问题是我向子流程发送输入的方式

您不应该将每个图像分别发送到ffmpeg（即frames.forEach（ffmpeg.stdin.write）），而应该为要发送到进程的所有输入数据创建一个缓冲区，并将其写入其stdin

ffmpeg.stdin.end（）

应在后面调用，以指示输入结束

ffmpeg.stdin.write(Buffer.concat(frames))
ffmpeg.stdin.end()