图像管从php到ffmpeg [英] Image pipe from php to ffmpeg

问题描述

我正在通过PHP为图像序列提供FFMpeg，以便从中获取视频。我使用这个shell命令从文本文件中读取图像文件名：

I'm tring to feed FFMpeg whith an image sequence through PHP in order to get a video out of it. I'm using this shell command to read from a text file the image filenames:

cat $(cat " . $image-list-file . ") | ffmpeg -f image2pipe ...

我想输出到管道prom php，也许在修改后图像通过imagemagik或gd。

I would like to output to the pipe prom php, maybe after modifying the images through imagemagik or gd.

如何在PHP中执行此操作？

How can I do this in PHP?

编辑：

使用proc_open和buffer的组合做了这个工作。
这是一个使用GD生成图片的工作测试脚本。

Using a combination of proc_open and buffer did the job. Here's a working test script using some GD generated pictures.

<?php
set_time_limit(0);
$descriptors = array(
    0 => array("pipe", "r")
);

$command = "ffmpeg -f image2pipe -pix_fmt rgb24 -r 30 -c:v png -i - ".
                "-r 30 -vcodec libx264 -pix_fmt yuv420p ".
                "-y test.mp4";

$ffmpeg = proc_open($command, $descriptors, $pipes);

if (is_resource($ffmpeg)){
    for ($i = 0; $i < 180; $i++) {
        $im = @imagecreate(300, 300) or die("GD error");
        $background_color = imagecolorallocate($im, 0, 0, 0);
        $line_color = imagecolorallocate($im, 233, 14, 91);
        $x = rand(0, 300);
        imageline ($im, $x, 0, $x, 300, $line_color);
        ob_start();
        imagepng($im);
        fwrite($pipes[0], ob_get_clean());
        imagedestroy($im);
    }
    fclose($pipes[0]);
}

推荐答案

没有示例文件的示例。但是您应该使用 proc_open（） 。 proc_open（）在shell中执行命令行，并允许对输入/输出管道进行直接读/写访问。所以你可以在管道完成之前读取输出。您可以在我所链接的手册中找到例子。

It's hard to give a working example without having the example files. But you should use proc_open() for that. proc_open() executes the command line in a shell and allows direct read/write access to input/output pipes. So you can read output before the pipe has finished. You'll find examples on the manual that I've linked.

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