Check that this S3 stream is 'seekable' first

Signed-off-by: invario <[email protected]>

Author: invario

lib/private/Preview/Movie.php

@@ -43,11 +43,16 @@ public function isAvailable(FileInfo $file): bool {
 	}
 
 	private function connectDirect(File $file): string|false {
+		if (stream_get_meta_data($file->fopen('r'))['seekable']!== true) {
+			return false;
+		}
+
 		// Checks for availability to access the video file directly via HTTP/HTTPS.
 		// Returns a string containing URL if available. Only implemented and tested
 		// with Amazon S3 currently.  In all other cases, return false. ffmpeg
 		// supports other protocols so this function may expand in the future.
 		$gddValues = $file->getStorage()->getDirectDownload($file->getName());
+		
 		if (is_array($gddValues)) {
 			if (array_key_exists('url', $gddValues) && array_key_exists('presigned', $gddValues)) {
 				$directUrl = (str_starts_with($gddValues['url'], 'http') && ($gddValues['presigned'] === true)) ? $gddValues['url'] : false;