From ab058d15c524bd9ddaf9659f855be384408552b7 Mon Sep 17 00:00:00 2001
From: Jakub Trllo <43494761+iLLiCiTiT@users.noreply.github.com>
Date: Thu, 2 Oct 2025 09:59:40 +0200
Subject: [PATCH] copy implementation from ayon api

---
 client/ayon_core/lib/transcoding.py | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/client/ayon_core/lib/transcoding.py b/client/ayon_core/lib/transcoding.py
index dd44d4a673..36a0caef27 100644
--- a/client/ayon_core/lib/transcoding.py
+++ b/client/ayon_core/lib/transcoding.py
@@ -1563,11 +1563,13 @@ def get_media_mime_type(filepath: str) -> Optional[str]:
     if b'xmlns="http://www.w3.org/2000/svg"' in content:
         return "image/svg+xml"
 
-    # JPEG, JFIF or Exif
-    if (
-        content[0:4] == b"\xff\xd8\xff\xdb"
-        or content[6:10] in (b"JFIF", b"Exif")
-    ):
+    # JPEG
+    # - [0:2] is constant b"\xff\xd8"
+    #   (ref. https://www.file-recovery.com/jpg-signature-format.htm)
+    # - [2:4] Marker identifier b"\xff{?}"
+    #   (ref. https://www.disktuna.com/list-of-jpeg-markers/)
+    # NOTE: File ends with b"\xff\xd9"
+    if content[0:3] == b"\xff\xd8\xff":
         return "image/jpeg"
 
     # Webp