diff --git a/lib/private/Preview/Movie.php b/lib/private/Preview/Movie.php
index 91857effbe1e0..7373614e8c3b2 100644
--- a/lib/private/Preview/Movie.php
+++ b/lib/private/Preview/Movie.php
@@ -307,6 +307,8 @@ private function generateThumbNail(int $maxX, int $maxY, string $absPath, int $s
 		$returnCode = -1;
 		$output = '';
 		if (is_resource($proc)) {
+			stream_set_blocking($pipes[1], false);
+			stream_set_blocking($pipes[2], false);
 			$stderr = trim(stream_get_contents($pipes[2]));
 			$stdout = trim(stream_get_contents($pipes[1]));
 			$returnCode = proc_close($proc);