<?php
$num_thumbs = 9;
$input_file = 'yourfile.mpg';
$output_file_prefix = 'yourfile';
$output_file_format = 'png';
 
$time_from_end = 0.5;
 
$input_duration = trim ( `ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "{$input_file}"` );
$interval = (float) ( $input_duration / $num_thumbs );
 
for ( $i = 0; $i < $num_thumbs; $i++ ) {
	if ( $i === ( $num_thumbs - 1 ) ) { $interval_time = $input_duration - $time_from_end; }
	else { $interval_time = $interval * $i; }
	$num = str_pad ( $i + 1, 2, '0', STR_PAD_LEFT );
	$cmd = "ffmpeg -ss {$interval_time} -i \"{$input_file}\" -frames:v 1 \"{$output_file_prefix}.{$num}.{$output_file_format}\"";
	echo "\n\n" . $cmd . "\n\n";
	passthru ( $cmd );
}
 
?>