如何从fluent ffmpeg到aws3?

我在尝试:

        const passthroughStream = new PassThrough()
        ffmpeg(stream).audioBitrate(8)
            .output(passthroughStream, { end: true })
            .on('progress', (p) => console.log(p))
            .on('error', (err) => console.log(err))

        const bucketStreamParams = {
            Bucket: 'mybucket,
            Key: outputFilename,
            Body: passthroughStream
        }

        const s3Response = await s3.upload(bucketStreamParams).promise()

PassThrough 会处理好的,但似乎不行。任何帮助都将不胜感激。