我在ubuntu中为gstreamer应用程序（管道）编写了一个脚本，通过网络摄像头和一个帧抓取器捕获2个视频流并将它们放入一个容器中：
gst-launch -e mpegtsmux name="muxer" ! filesink location=TestHDMainCamera.ts \
v4l2src device="/dev/video1" ! video/x-raw-yuv, width=1280 ,height=720, \
framerate=30/1 ! videorate ! ffmpegcolorspace ! x264enc ! muxer. \
v4l2src device="/dev/video0" ! video/x-raw-yuv, width=1024 ,height=768, \
framerate=30/1 ! x264enc ! muxer. pulsesrc \
device="alsa_input.usb-046d_Logitech_Webcam_C930e_AAF8A63E-02-C930e.analog-stereo" \
! audioconvert ! lamemp3enc target=1 cbr=true ! muxer.
我只是将它放入.sh文件并通过终端执行。为了让生活更轻松我写了一个简单的PHP代码来创建一个简单的（！）网站界面（在本地主机上运行）来控制捕获过程（开始：运行.sh文件并停止：Ctrl + c）
包括两个额外的按钮，分别测试来自帧抓取器和网络摄像头的流，看看它们是否已连接：
网络摄像头测试预览：
gst-launch v4l2src device=/dev/video1 ! ffmpegcolorspace ! xvimagesink
FrameGrabber的测试预览：
gst-launch v4l2src device=/dev/video0 ! ffmpegcolorspace ! xvimagesink
以下是问题：
每次我加载页面并按下开始按钮时，似乎php执行.sh管道并立即终止它（我在屏幕上显示此消息：释放管道...）因此我得不到捕获的流（ ！）即使我尝试使用测试按钮来获得直播结果也是一样的......
你能帮助我并告诉我如何使用这个PHP代码运行gstreamer捕获的管道代码？ （只有当我按下“停止”按钮才能执行Ctrl + c功能时，才需要终止gstreamer管道）
更多信息：
这是界面的main.php代码（它有点乱，抱歉）：
<html>
<head>
<title>PHP Test</title>
</head>
<body>
<?php
echo '<p>Hello</p>';
print_r($_GET);
if (isset($_GET['action'])) {
switch ($_GET['action']) {
case 'Test Webcam':
testWebcam();
break;
case 'Test Framegrabber':
testFramegrabber();
break;
}
}
function testFramegrabber() {
echo "The Test Framegrabber function is called.";
$output = shell_exec('ls -lart');
echo "<pre>$output</pre>";
}
function testWebcam() {
echo "The Test Webcam function is called.";
$output = shell_exec('ls -lart');
echo "<pre>$output</pre>";
}
//$output = shell_exec('ls -lart');
//echo "<pre>$output</pre>";
?>
<form action="main.php">
<input type="submit" class="button" name="action" value="Test Webcam" />
<input type="submit" class="button" name="action" value="Test Framegrabber" />
</form>
</body>
</html>
这里是按钮和其他细节的record.php：
<html>
<head>
<title>Recording page</title>
<link rel="stylesheet" type="text/css" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<script type="text/javascript">
var w = null; // initialize variable
//function to start the timer
function startTimer()
{
// First check whether Web Workers are supported
if (typeof(Worker)!=="undefined"){
// Check whether Web Worker has been created. If not, create a new Web Worker based on the Javascript file simple-timer.js
if (w==null){
w = new Worker("simple-timer.js");
}
// Update timer div with output from Web Worker
w.onmessage = function (event) {
document.getElementById("timer").innerHTML = event.data;
};
} else {
// Web workers are not supported by your browser
document.getElementById("timer").innerHTML = "Sorry, your browser does not support Web Workers ...";
}
}
//function to stop the timer
function stopTimer()
{
w.terminate();
timerStart = true;
w = null;
}
function handleTimer() {
document.getElementById("timerp").innerHTML = "start timer";
}
</script>
</head>
<body>
<?php
echo '<p>Hello</p>';
print_r($_GET);
if (isset($_GET['action'])) {
switch ($_GET['action']) {
case 'Test Webcam':
testWebcam();
break;
case 'Test Framegrabber':
testFramegrabber();
break;
case 'Record':
record();
break;
}
}
function testFramegrabber() {
echo "The Test Framegrabber function is called.";
$output = shell_exec('ls -lart');
echo "<pre>$output</pre>";
}
function testWebcam() {
echo "The Test Webcam function is called.";
$output = shell_exec('ls -lart');
echo "<pre>$output</pre>";
}
function record(){
echo "The Record function is called.";
echo "<script> startTimer(); </script>";
}
function stop(){
echo "The Stop function is called.";
echo "<script> stopTimer(); </script>";
}
//$output = shell_exec('ls -lart');
//echo "<pre>$output</pre>";
?>
<div class="header">A simple timer:</div>
<div class="timer" id="timer">00:00</div>
<div class="buttons">
<button onclick="startTimer()" id="button1">Start</button>
<button onclick="stopTimer()" id = "button2">Stop</button>
</div>
<form class="form-horizontal" action="record.php">
<fieldset>
<!-- Form Name -->
<legend>Sreen recorder</legend>
<table class="tg" width="100%">
<tr>
<th class="tg-031e"></th>
<th class="tg-031e">fdsfs</th>
</tr>
<tr>
<td class="tg-031e"></td>
<td class="tg-031e"></td>
<td class="tg-031e"></td>
</tr>
<tr>
<td class="tg-031e"></td>
<td class="tg-031e"></td>
<td class="tg-031e"></td>
</tr>
<tr>
<td class="tg-031e">
<!-- Button -->
<div class="control-group">
<label class="control-label" for="recordbtn"></label>
<div class="controls">
<button id="recordbtn" name="action" class="btn btn-danger" value="Record" onclick="startTimer()">Record</button>
</div>
</div>
</td>
<td class="tg-031e">
<!-- Button -->
<div class="control-group">
<label class="control-label" for="stopbtn"></label>
<div class="controls">
<button id="stopbtn" name="action" class="btn btn-inverse" value="Stop" onclick="stopTimer()">Stop</button>
</div>
</div>
</td>
<td class="tg-031e">
<!-- Button -->
<div class="control-group">
<label class="control-label" for="nextbtn"></label>
<div class="controls">
<button id="nextbtn" name="action" class="btn btn-inverse">Next recording</button>
</div>
</div>
</td>
</tr>
</table>
<!-- Button -->
<div class="control-group">
<label class="control-label" for="webcamTest"></label>
<div class="controls">
<button id="webcamTest" name="action" value="Test Webcam" class="btn btn-info">Test Webcam</button>
</div>
</div>
<!-- Button -->
<div class="control-group">
<label class="control-label" for="testFramegrabber"></label>
<div class="controls">
<button id="testFramegrabber" name="action" value="Test Framegrabber" class="btn btn-info">Test Framegrabber</button>
</div>
</div>
<!-- Select Basic -->
<div class="control-group">
<label class="control-label" for="recordPath">Path to record</label>
<div class="controls">
<select id="recordPath" name="recordPath" class="input-xlarge">
<option>/desktop</option>
<option>/home/var</option>
</select>
</div>
</div>
</fieldset>
</form>
</body>
</html>
只是在页面上捕获时显示的简单计时器：
var timerStart = true;
function myTimer(d0)
{
// get current time
var d=(new Date()).valueOf();
// calculate time difference between now and initial time
var diff = d-d0;
// calculate number of minutes
var minutes = Math.floor(diff/1000/60);
// calculate number of seconds
var seconds = Math.floor(diff/1000)-minutes*60;
var myVar = null;
// if number of minutes less than 10, add a leading "0"
minutes = minutes.toString();
if (minutes.length == 1){
minutes = "0"+minutes;
}
// if number of seconds less than 10, add a leading "0"
seconds = seconds.toString();
if (seconds.length == 1){
seconds = "0"+seconds;
}
// return output to Web Worker
postMessage(minutes+":"+seconds);
}
if (timerStart){
// get current time
var d0=(new Date()).valueOf();
// repeat myTimer(d0) every 100 ms
myVar=setInterval(function(){myTimer(d0)},100);
// timer should not start anymore since it has been started
timerStart = false;
}
答案 0 :(得分：0)
我建议检查你的apache用户。 你说你正在使用ubuntu，所以它将是“www-data”，它可能无法访问你的DISPLAY或“/ dev / video0”。
尝试在终端中执行.sh作为www-data（您可能需要在/ etc / passwd中启用对www-data的shell访问）
一个快速而肮脏的解决方案是以普通用户身份运行您的php。从终端写道：
php -S 0.0.0.0:8080 -t your_directory /
答案 1 :(得分：0)
我遇到了同样的问题，我无法从PHP代码启动GStreamer管道。但是我可以从终端开始。
对我来说，解决方案是我必须在命令前使用'SUDO'。当我在Apache服务器上运行PHP代码时。 apache服务器在www-data用户上运行，并且需要SUDO访问权限才能运行命令。
我正在使用：（在PHP中）
$start = shell_exec('usr/bin/gst-launch-1.0 v4l2src device=/dev/video0 ! "video/x-raw, format=(string)UYVY, width=(int)1920,height=(int)1080" ! nvvidconv ! "video/x-raw(memory:NVMM),format=(string)I420" ! omxh264enc bitrate=3000000 ! flvmux ! rtmpsink location="rtmp://127.0.0.1:1936/mycamera/mystream" 2>&1 &');
echo "<pre>$start</pre>";
但是我必须在SUDO中使用以下'sudo'：（在PHP中）
$start = shell_exec('sudo /usr/bin/gst-launch-1.0 v4l2src device=/dev/video0 ! "video/x-raw, format=(string)UYVY, width=(int)1920,height=(int)1080" ! nvvidconv ! "video/x-raw(memory:NVMM),format=(string)I420" ! omxh264enc bitrate=3000000 ! flvmux ! rtmpsink location="rtmp://127.0.0.1:1936/webcam/mystream" 2>&1 &');
echo "<pre>$start</pre>";