RAM-Problem using FFmpeg-PHP

[karoo]

Hey,
I am facing a weird problem.
I am using FFmpeg-PHP to create thumbnails of some videos, those thumbs I paste into a larger preview Picture, using gdlib.
That far everything works fine.
I am doing all that in a Loop, so ffmpeg-php has to make 10 to 20 preview-pictures of different videos. The Problem now is, if my skript did the first preview-picture, it doesn't free the used resources, so I am running out of memory after the 5th video.

The question now is: Why? I destroyed and unset all resource-Handler, and so on...

Here is the Skript:


<?php
error_reporting(E_ALL);
$extension = "ffmpeg";
$extension_soname = $extension . "." . PHP_SHLIB_SUFFIX;
$extension_fullname = PHP_EXTENSION_DIR . "/" . $extension_soname;

// load extension
if(!extension_loaded($extension)) {
dl($extension_soname) or die("Can't load extension $extension_fullname\n");
echo "Load FFmpeg-php!\n";
}

class VidPreview
{
private $pathToVid;
private $video;
private $preview;
private $previewX;
private $previewY;

public function __construct($pathToVid, $previewX, $previewY)
{
$this->pathToVid = $pathToVid;
$this->previewX = $previewX;
$this->previewY = $previewY;
$this->video = new ffmpeg_movie($this->pathToVid);

//init gd for main picture
$this->preview = imagecreate($this->previewX, $this->previewY);
imagecolorallocate($this->preview, 250, 250, 200);
imagestring($this->preview, 5, $this->previewX/2, 20, "Preview!", 5);
}

private function makeScreenshot($frame)
{
$ff_frame = $this->video->getFrame($frame);
if(method_exists($ff_frame, 'toGDImage'))
{
$screenshot = $ff_frame->toGDImage();
}
else
{
$screenshot = false;
}
unset($ff_frame);
return $screenshot;
}

public function makePreview($pathToSave, $amountOfShots)
{
//get video-frame-number
$frameNumber = $this->video->getFrameCount();
$frameValue = round(($frameNumber / $amountOfShots))-1;
$frameValueStep = $frameValue;

$dst_x = 20;
$dst_y = 40;
while($frameNumber >= $frameValue)
{
$screenshot = $this->makeScreenshot($frameValue);
if($screenshot != false)
{
if($dst_x >= $this->previewX)
{
$dst_y = $dst_y + 20 + 135;
$dst_x = 20;
}
//copy screen to preview
imagecopyresized($this->preview, $screenshot , $dst_x, $dst_y , 0 , 0 , 240 , 135 , 720 , 406 );//TODO FIX VID VALUES
imagedestroy($screenshot);
unset($screenshot);
//TODO FIX PREVIEW BUG
$dst_x = $dst_x + 240 + 20;
$frameValue = $frameValue + $frameValueStep;
echo '$dst_x: '.$dst_x." ".'$dst_y: '.$dst_y.' '.'$frameNumber, $frameValue: '.$frameValue.','.$frameNumber."\n";
}
else
{
fwrite(STDOUT, "FFmpeg-php messed up! I will just skip this screenshot... \n");
unset($screenshot);
$frameValue = $frameValue + $frameValueStep;
}
}

if(!imagejpeg($this->preview, $pathToSave, 100))
{
imagedestroy($this->preview);
unset($this->preview);
unset($this->video);
return false;
}
imagedestroy($this->preview);
unset($this->preview);
unset($this->video);
return true;
}

function __destruct()
{
unset($this->pathToVid);
unset($this->video);
unset($this->preview);
unset($this->previewX);
unset($this->previewY);
}
}


?>

hope somebody can help, it looks a little nasty, because I added some extra unset :D.

Here is the function call:


if(!file_exists($pathToPic.'/'.$dirName.".jpg"))
{
fwrite(STDOUT, "Making pictures of: ".$file." \n");
$preview = new VidPreview($pathToVid,1000, 700);
$preview->makePreview($pathToPic.'/'.$dirName.".jpg", 16);
unset($preview);
}

this snippet runs in a for-each-loop.

greets
karoo

[karoo]

nobody?