使用管道字符 | child_process 产卵

Question

我在 raspberry pi 上运行ning nodejs，我想运行一个子进程来生成网络摄像头流。

节点外我的命令是：

raspivid -n -mm matrix -w 320 -h 240 -fps 18 -g 100 -t 0 -b 5000000 -o - | ffmpeg -y -f h264 -i - -c:v copy -map 0:0 -f flv -rtmp_buffer 100 -rtmp_live live "rtmp://example.com/big/test"

对于 child_process 我必须分解每个参数

var args = ["-n", "-mm", "matrix", "-w", "320", "-h", "240", "-fps", "18", "-g", "100", "-t", "0", "-b", "5000000", "-o", "-", "|", "ffmpeg", "-y", "-f", "h264", "-i", "-", "-c:v", "copy", "-map", "0:0", "-f", "flv", "-rtmp_buffer", "100", "-rtmp_live", "live", "rtmp://example.com/big/test"];

camera.proc = child.spawn('raspivid', args);

然而它在 | 字符上窒息：

error, exit code 64
Invalid command line option (|)

如何使用这个管道字符作为参数？

Answer 1

这已在另一个问题中得到回答：Using two commands (using pipe |) with spawn

总而言之，对于 child.spawn，args 中的所有内容都应该是您的 'raspivid' 命令的参数。在您的情况下，管道及其后的所有内容实际上是 sh.

的参数

解决方法是调用 child.spawn('sh', args)，其中 args 是：

 var args = ['-c', <the entire command you want to run as a string>];

使用管道字符 | child_process 产卵

Using a pipe character | with child_process spawn

ffmpeg

child-process

node.js