/**
* 영상에서 snapshot 추출
*
* @param string $content media content
* @param int $fromSecond 영상에서의 시간(초 단위)
* @return string
*/
public function getSnapshot($content, $fromSecond = 10)
{
$videoFile = $this->temp->create($content);
$imgPathname = $this->temp->getTempPathname();
$video = $this->ffmpeg->open($videoFile->getPathname());
$video->frame(TimeCode::fromSeconds($fromSecond))->save($imgPathname);
$imageContent = file_get_contents($imgPathname);
$videoFile->destroy();
@unlink($imgPathname);
return $imageContent;
}