better avif guessing

1 files changed, 16 insertions, 3 deletions

diff --git a/transcoder/src/image.rs b/transcoder/src/image.rs
index c9749fc..3589ab9 100644
--- a/transcoder/src/image.rs
+++ b/transcoder/src/image.rs
@@ -41,10 +41,23 @@ pub async fn transcode(
                     file.seek(SeekFrom::Start(0))
                         .context("seeking back to start")?;
                     // TODO: magic experimentally found and probably not working in all cases but fine as long as our avif enc uses that
-                    magic
-                        == [
-                            0x00, 0x00, 0x00, 0x18, 0x66, 0x74, 0x79, 0x70, 0x61, 0x76, 0x69, 0x66,
+                    matches!(
+                        magic,
+                        [
+                            0x00,
+                            0x00,
+                            0x00,
+                            _,
+                            b'f',
+                            b't',
+                            b'y',
+                            b'p',
+                            b'a',
+                            b'v',
+                            b'i',
+                            b'f',
                         ]
+                    )
                 };
                 let original = if is_avif {
                     let mut buf = Vec::new();