php使用ffmpeg向视频中添加文字字幕

本文实例讲述了PHP使用ffmpeg给视频增加字幕显示的方法。分享给大家供大家参考。具体实现方法如下：

<?php
$dir = \'./\'; // set to current folder
if ($handle = opendir($dir)) {
 while(false!== ($file = readdir($handle))) {
 if ( is_file($dir.$file) ){
 if (preg_match(\"\'\\.(avi)$\'\", $file) ){
 $sub_file = str_ireplace(\".avi\", \".srt\", $dir.$file);
 $idx_file = str_ireplace(\".avi\", \".idx\", $dir.$file);
 $thumb_file = str_ireplace(\".avi\", \".jpg\", $dir.$file);
 $out_file = str_ireplace(\".avi\", \".mp4\", $dir.$file);
 flv_convert_get_thumb($dir.$file, $sub_file, $idx_file, $thumb_file, $out_file);
 }
 else{
 continue;
 }
 }
 }
 closedir($handle);
}
//flv_convert_get_thumb(\'input.avi\', \'input.srt\', \'output.jpg\', \'output.ogm\');
// code provided and updated by steve of phpsnaps ! thanks
// accepts:
// 1: the input video file
// 2: path to thumb jpg
// 3: path to transcoded mpeg?
function flv_convert_get_thumb($in, $in_sub, $in_idx, $out_thumb, $out_vid){
 // get thumbnail
 $cmd = \'ffmpeg -v 0 -y -i \'.$in.\' -v s 1 -ss 250 -vcodec mjpeg -f rawvideo -s 286x160 -aspect 16:9 \'.$out_thumb;
 $res = shell_exec($cmd);
 // $res is the output of the command
 // transcode video
$cmd = \'mencoder \'.$in.\' -o \'.$out_vid.\' -sub \'.$in_sub.\' -subfont-text-scale 3.0 -subpos 99 -af volume=10 -aspect 16:9 -of avi -noodml -ovc x264 -x264encop$
 $res = shell_exec($cmd);
}
?>

希望本文所述对大家的php程序设计有所帮助。