From 1bcc80b5f45a0d8619df64edbd2fec797fd70cd9 Mon Sep 17 00:00:00 2001
From: Andrey Dyakov <adduxa@gmail.com>
Date: Tue, 2 Jun 2026 00:55:28 +0400
Subject: [PATCH] fix(previews): ffprobe hangs

Signed-off-by: Andrey Dyakov <adduxa@gmail.com>
---
 AUTHORS                       |  1 +
 lib/private/Preview/Movie.php | 34 ++++++++++++++++++++++++++++++++--
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/AUTHORS b/AUTHORS
index fe478401fddb4..fa5776e3ef575 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -32,6 +32,7 @@
  - Andreas Pflug <dev@admin4.org>
  - Andrew Brown <andrew@casabrown.com>
  - Andrey Borysenko <andrey.borysenko@nextcloud.com>
+ - Andrey Dyakov <adduxa@gmail.com>
  - André Gaul <gaul@web-yard.de>
  - Andy Xheli <axheli@axtsolutions.com>
  - Anna Larch <anna@nextcloud.com>
diff --git a/lib/private/Preview/Movie.php b/lib/private/Preview/Movie.php
index f34bf60c14773..a876b1e120314 100644
--- a/lib/private/Preview/Movie.php
+++ b/lib/private/Preview/Movie.php
@@ -289,9 +289,39 @@ private function useHdr(string $absPath): bool {
 		if ($test_hdr_proc === false) {
 			return false;
 		}
-		$test_hdr_stdout = trim(stream_get_contents($test_hdr_pipes[1]));
-		$test_hdr_stderr = trim(stream_get_contents($test_hdr_pipes[2]));
+
+		stream_set_blocking($test_hdr_pipes[1], false);
+		stream_set_blocking($test_hdr_pipes[2], false);
+
+		$test_hdr_stdout = '';
+		$test_hdr_stderr = '';
+
+		while (!feof($test_hdr_pipes[1]) || !feof($test_hdr_pipes[2])) {
+			$read = array_filter([
+				!feof($test_hdr_pipes[1]) ? $test_hdr_pipes[1] : null,
+				!feof($test_hdr_pipes[2]) ? $test_hdr_pipes[2] : null,
+			]);
+			$write = $except = [];
+			if (stream_select($read, $write, $except, 5) === false) {
+				break;
+			}
+			foreach ($read as $pipe) {
+				$chunk = fread($pipe, 8192);
+				if ($chunk === false) continue;
+				if ($pipe === $test_hdr_pipes[1]) {
+					$test_hdr_stdout .= $chunk;
+				} else {
+					$test_hdr_stderr .= $chunk;
+				}
+			}
+		}
+
+		fclose($test_hdr_pipes[1]);
+		fclose($test_hdr_pipes[2]);
 		proc_close($test_hdr_proc);
+
+		$test_hdr_stdout = trim($test_hdr_stdout);
+		$test_hdr_stderr = trim($test_hdr_stderr);
 		// search build options for libzimg (provides zscale filter)
 		$ffmpeg_libzimg_installed = strpos($test_hdr_stderr, '--enable-libzimg');
 		// Only values of "smpte2084" and "arib-std-b67" indicate an HDR video.