PHP使用ffmpeg为视频生成预览图

默认取视频第1秒截图作为预览图

<?phpnamespace app\common\library;//视频获取第一帧做缩略图
class VideoThumb
{public $timeStamp = '00:00:01';public function createThumb($videoPath){$uploadPath = public_path() . '/uploads/';$videoPath = $uploadPath . $videoPath;if (!is_file($videoPath)) {return false;}if (!$this->isVideoFile($videoPath)) {return false;}$thumbPath = 'videos_thumb/' . $this->autoBuildName() . '.jpg';$thumbPathFull = $uploadPath . $thumbPath;$dir = dirname($thumbPathFull);if (!is_dir($dir)) {mkdir($dir, 0777, true);}// FFmpeg命令，-ss表示时间戳，-vframes 1表示只截取一帧，-f image2表示输出图片格式$ffmpegCommand = "ffmpeg -ss {$this->timeStamp} -i \"{$videoPath}\" -frames:v 1 \"{$thumbPathFull}\"";// 执行FFmpeg命令$output = [];exec($ffmpegCommand, $output, $returnVar);// 检查命令是否成功执行return $returnVar == 0 ? $thumbPath : false;}public function isVideoFile($filePath){// 创建一个fileinfo资源$finfo = finfo_open(FILEINFO_MIME_TYPE);// 获取文件的MIME类型$mimeType = finfo_file($finfo, $filePath);// 关闭fileinfo资源finfo_close($finfo);// 定义可能的视频MIME类型$videoTypes = ['video/mp4','video/avi','video/quicktime','video/x-msvideo','video/x-ms-wmv','video/mpeg','video/ogg','video/webm','video/3gpp','video/3gpp2','video/quicktime','video/x-matroska',];// 检查MIME类型是否在视频类型数组中return in_array($mimeType, $videoTypes);}/*** 自动生成文件名* @access protected* @return string*/public function autoBuildName(){return date('Ymd') . DIRECTORY_SEPARATOR . md5(microtime(true));}
}