小智 8
它不起作用,因为你永远不会执行$cmd.实际执行$cmd您可能需要使用popen(),proc_open()或exec().
试试这个功能.只要ffmpeg可访问,它就应该生成一个图像.要使其可访问,请将其添加到$pathLinux中,将其放入windows/system32Windows中的文件夹中.或者将其添加到Windows控制面板中的环境变量中.
/**
* ExtractThumb, extracts a thumbnail from a video
*
* This function loads a video and extracts an image from a frame 4
* seconds into the clip
* @param $in string the input path to the video being processed
* @param $out string the path where the output image is saved
*/
function ExtractThumb($in, $out)
{
$thumb_stdout;
$errors;
$retval = 0;
// Delete the file if it already exists
if (file_exists($out)) { unlink($out); }
// Use ffmpeg to generate a thumbnail from the movie
$cmd = "ffmpeg -itsoffset -4 -i $in -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 $out 2>&1";
exec($cmd, $thumb_stdout, $retval);
// Queue up the error for processing
if ($retval != 0) { $errors[] = "FFMPEG thumbnail generation failed"; }
if (!empty($thumb_stdout))
{
foreach ($thumb_stdout as $line)
{
echo $line . "
\n";
}
}
if (!empty($errors))
{
foreach ($errors as $error)
{
echo $error . "
\n";
}
}
}
$thumb_stdout - 显示与CLI中相同的输出.这有助于查看ffmpeg正在执行的操作的详细信息,以及查看ffmpeg无法正常工作时崩溃的位置.
$errors - 如果CLI退出并显示错误代码(IE,如果ffmpeg崩溃),则会显示错误.