tk.php

<?php

$file = $argv[1];
$ffmpeg = './ffmpeg';

if(empty($file)){
    die('no file provide');
}

$length = shell_exec("$ffmpeg -i $file 2>&1 | grep Duration | cut -d ' ' -f 4 | sed s/,//");
$length = trim($length);

//copy会产生前几帧跳帧，多截20秒
$length = strtotime("1970-01-01 $length UTC") + 20;

$info  = shell_exec("$ffmpeg -i $file 2>&1 |  perl -lane 'print $1 if /([1-9]\d+x\d+)/'");
$info = trim($info);
list($width, $height) = explode('x', $info);


shell_exec("$ffmpeg -y -i $file -vf hflip -c:a copy ${file}_OUTPUT.mp4");
shell_exec("mv ${file}_OUTPUT.mp4 $file");

$start_m = mt_rand(0,45);
$start_s = mt_rand(0,59);

shell_exec("$ffmpeg -y -i overlay.mp4 -ss $start_m:$start_s -t $length -c copy ${file}_overlay.mp4");

//-10TB,overlay从第10秒开始截取，防止前几帧跳帧
shell_exec("$ffmpeg -y \
    -i $file -i ${file}_overlay.mp4 \
    -filter_complex \" \
        [0:v]setpts=PTS-STARTPTS[top]; \
        [1:v]setpts=PTS-10/TB, \
        	scale=$width:$height,
             format=yuva420p,colorchannelmixer=aa=0.02[bottom]; \
        [top][bottom]overlay=eof_action=endall\" \
    -vcodec libx264 ${file}_out.mp4");

shell_exec("rm ${file}_overlay.mp4");
shell_exec("mv ${file}_out.mp4 $file");

/*
shell_exec("echo 'file $file
   file  tail.mp4' | \
$ffmpeg -safe 0 -protocol_whitelist file,pipe,http,https,tcp,tls -f concat -i -  ${file}_OUTPUT.mp4");
shell_exec("$ffmpeg -y -i ${file}_OUTPUT.mp4 $file");
shell_exec("rm ${file}_OUTPUT.mp4");
 */