从cmd行程序(rtmpdump.exe)捕获PHP exec()输出的替代方法

Question

我过去曾多次使用exec()函数从命令行可执行文件中捕获信息,并打算使用RTMPDump.exe再次执行此操作.PHP代码如下,并且与我过去使用的任何其他cmd行示例一起使用,但在这种情况下不会产生任何$ output:

    $cmd = 'c:\rtmpdump\rtmpdump -r "rtmp://fms.domain.com/live/live_800"';
    exec($cmd, $output);
    foreach ($output as $item){
        // do something with this $item
    }

我已经通过将Windows命令行放在.bat文件中并运行它来尝试它,其中ase $ output然后仅包含bat文件中回显的内容,但不包含下面显示的输出,这是我的结果从命令行手动运行该命令.

C:\rtmpdump>rtmpdump -r "rtmp://fms.domain.com/live/live_800"
RTMPDump v2.3
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
ERROR: rtmp server sent error
Starting Live Stream
For duration: 2.000 sec
INFO: Metadata:
INFO:   author
INFO:   copyright
INFO:   description
INFO:   keywords
INFO:   rating
INFO:   title
INFO:   presetname            Custom
INFO:   creationdate          Tue May 08 03:00:23 2012
INFO:   videodevice           Osprey-440 Video Device 1B
INFO:   framerate             25.00
INFO:   width                 480.00
INFO:   height                360.00
INFO:   videocodecid          avc1
INFO:   videodatarate         800.00
INFO:   avclevel              30.00
INFO:   avcprofile            66.00
INFO:   videokeyframe_frequency10.00
INFO:   audiodevice           Osprey-440 Audio Device 1B
INFO:   audiosamplerate       22050.00
INFO:   audiochannels         1.00
INFO:   audioinputvolume      75.00
INFO:   audiocodecid          mp4a
INFO:   audiodatarate         48.00
#######
Download complete

C:\rtmpdump>rtmpdump

程序运行,这不是问题,有一个输出文件显示视频数据转储,因此可执行文件的语法不是问题 - 问题是是否有任何其他方法来拦截rtmpdump.exe输出到的内容命令窗口,不是通过exec()从PHP运行它来捕获的.

如果重要的话,那就是我有兴趣使用的"信息:......".我正在尝试确定实时视频流是否正在流式传输.服务器正在运行,但我需要知道特定的流(live_800)是否正在流式传输.

Answer 1

感谢JohnF让我走上了正确的轨道,如果其他任何新手需要完成此任务,这就是我使用proc_open的方式:

$descriptorspec = array(
0 => array("pipe", "r"),    // stdin is a pipe that the child will read from
1 => array("pipe", "w"),    // stdout is a pipe that the child will write to
2 => array("pipe", "w")     // stderr is a pipe that the child will write to
);
$cmd = c:\rtmpdump\rtmpdump -r "rtmp://fms.domain.com/live/live_800 -B 1 -m 3";
$process = proc_open($cmd, $descriptorspec, $pipes);
if (is_resource($process)) {
    $stdin = stream_get_contents($pipes[0]);
    $stdout = stream_get_contents($pipes[1]);
    $stderr = stream_get_contents($pipes[2]);
    fclose($pipes[0]);  fclose($pipes[1]);  fclose($pipes[2]);
    // It is important that you close any pipes before calling proc_close in order to avoid a deadlock
    $return_value = proc_close($process);   
}