PHP+FFMPEG实现将视频自动转码成H264标准Mp4文件
最近做一个在线教学网的项目,需要实现上传任意格式视频自动为h264标准视频,使用html5播放。最终使用PHP+FFMPEG实现,在此将详细解决方案分享给大家!
配置php.ini文件
复制代码 代码如下:
file_uploads = on ;//是否允许通过HTTP上传文件的开关。默认为ON即是开
upload_tmp_dir ;//文件上传至服务器上存储临时文件的地方,如果没指定就会用系统默认的临时文件夹
upload_max_filesize = 1024m ;//望文生意,即允许上传文件大小的最大值。默认为2M,我们设置为1G
post_max_size = 1024m ;//指通过表单POST给PHP的所能接收的最大值,我们也设置为1G
max_execution_time = 3600 ;//每个PHP页面运行的最大时间值(秒),默认30秒,设置为一小时,,因为后面转码时间很久。
max_input_time = 36000 ;//每个PHP页面接收数据所需的最大时间,默认60秒
memory_limit = 8m ;//每个PHP页面所吃掉的最大内存,默认8M
文件上传插件
火焰雨推荐大家使用uploadify,Uploadify是JQuery的一个上传插件,实现带进度显示。插件安装简单,此处略过。
但是有个问题需要注意,非IE浏览器session会丢失,查了很多资料,最终总结的原因是:
因为诸如uploadify采用的是flash客户端,它产生的useragent与浏览器的user-agent不同。
最终解决办法:
复制代码 代码如下:
//在upmodify上传参数中加入session参数,如下:
scriptData: {"SESSION_ID":""},
// 在服务端接收页面加入以下代码:
if(@$_REQUEST['SESSION_ID'] && ($session_id=$_REQUEST['SESSION_ID']) !=session_id()){
session_destroy();
session_id($session_id);
@session_start();
}
这样就解决了 FLASH 不能正确传递页面
视频格式转换
现在Linux下比较流行的视频格式转换软件是FFMPEG,FFMPEG是用于录制、截图、转换和流化音频和视频的完整解决方案,一套领先的音/视频编解码类库。除了FFMPEG外,我们要转码成H264格式 ,还需要一个扩展。(文章最后给出所有软件包下载地址)
centos 5.4环境下安装源码安装h264扩展
复制代码 代码如下:
tar -xjvf x264-snapshot-20120718-2245-stable.tar.bz2
#进入解压后的源文件目录
cd x264-snapshot-20120718-2245-stable/
./configure --prefix=/usr/local --enable-shared
make
make install
//centos 5.4环境下安装源码安装ffmpeg with h264扩展
tar -xjvf ffmpeg-2.1.1.tar.bz2
//进入解压后目录
cd ffmpeg-2.1.1
./configure --enable-gpl --enable-libx264
make
make install
//重新加载配置
lcfonfig
//测试是否安装成功
ffmpeg
如果你看到以下内容说明安装成功:
复制代码 代码如下:
ffmpeg version 2.1.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Dec 17 2013 23:32:40 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
configuration: --enable-libx264 --enable-gpl
libavutil 52. 48.101 / 52. 48.101
libavcodec 55. 39.101 / 55. 39.101
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.100 / 3. 90.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
Use -h to get full help or, even better, run 'man ffmpeg'
php调用ffmpeg转码视频
复制代码 代码如下:
$cmd = 'FFMPEG -i uploadfile/video/test.wmv -c:v libx264 -strict -2 uploadfile/mp4/test.mp4';
exec($cmd, $status);
运行前请确认exec函数已经开启。否则请修改php.ini文件
最后附上FFMPEG+H264扩展+YASM+apache_mod_h264

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