[root@fedora html]# which ffmpeg 
/usr/bin/ffmpeg
[root@fedora html]# rpm -qi ffmpeg
Name        : ffmpeg
Version     : 2.6.3
Release     : 1.fc22
Architecture: x86_64
Install Date: Wed 10 Jun 2015 09:13:00 AM AZST
Group       : Unspecified
Size        : 7304932
License     : GPLv2+
Signature   : RSA/SHA1, Wed 03 Jun 2015 03:33:26 PM AZST, Key ID 81c9b42397f4d1c1
Source RPM  : ffmpeg-2.6.3-1.fc22.src.rpm
Build Date  : Wed 03 Jun 2015 03:06:06 PM AZST
Build Host  : builder02
Relocations : (not relocatable)
Packager    : http://free.rpmfusion.org/
Vendor      : RPM Fusion
URL         : http://ffmpeg.org/
Summary     : Digital VCR and streaming server
Description :
FFmpeg is a complete and free Internet live audio and video
broadcasting solution for Linux/Unix. It also includes a digital
VCR. It can encode in real time in many formats including MPEG1 audio
and video, MPEG4, h263, ac3, asf, avi, real, mjpeg, and flash.
[root@fedora html]# cat vid.php 
<?php
error_reporting(0);

$path=dirname(__FILE__);
$filename='testvid.mp4';
$sheklinadi='framesekil' . md5(mt_rand() . 'daxdaxdadaraxxxx') . '.jpg';
$saniye='00:00:25';//25-ci saniyenin frame shekli ucun//


shell_exec('echo Y|ffmpeg -ss ' . $saniye .' -i ' . $path .'/'. $filename . ' -vf scale=800:-1 -vframes 1 '  . $sheklinadi . '>/dev/null');


echo '<p align="center"><img src="' . $sheklinadi  . '"/></p>'. PHP_EOL;
exit(0);

?>
[root@fedora html]# cat vid.php 
<?php
error_reporting(0);

$path=dirname(__FILE__);
$filename='testvid.mp4';
$sheklinadi='framesekil' . md5(mt_rand() . 'daxdaxdadaraxxxx') . '.jpg';
$saniye='00:00:25';//25-ci saniyenin frame shekli ucun//


shell_exec('echo Y|ffmpeg -ss ' . $saniye .' -i ' . $path .'/'. $filename . ' -vf scale=800:-1 -vframes 1 '  . $sheklinadi . '>/dev/null');


echo '<p align="center"><img src="' . $sheklinadi  . '"/></p>'. PHP_EOL;
exit(0);

?>