PHP Code:
if( file_exists( $url.'/video.mp4') )
{
$filename = $url.'/video.mp4';
} else {
$filename = $url.'/video.flv';
}

$filename = $url.'video.mp4';
$ch = curl_init($filename);
curl_setopt($ch, CURLOPT_NOBODY, TRUE);
curl_exec($ch);
$ret = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if ($ret >= '400')
{
$filename = $url.'video.flv';
}
curl_close($ch);

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