From e9faee5e31247e96d6e59f50f9ef89ff9be2dfb5 Mon Sep 17 00:00:00 2001
From: darksv <darek969-12@o2.pl>
Date: Thu, 18 Nov 2021 19:13:53 +0100
Subject: [PATCH] mkv: fixed off-by-one error in FixedSize lacing mode

---
 symphonia-format-mkv/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/symphonia-format-mkv/src/lib.rs b/symphonia-format-mkv/src/lib.rs
index d9a389c4..9baa2dee 100644
--- a/symphonia-format-mkv/src/lib.rs
+++ b/symphonia-format-mkv/src/lib.rs
@@ -135,7 +135,7 @@ fn extract_frames(block: &[u8], buffer: &mut VecDeque<(u32, Box<[u8]>)>) -> Resu
             buffer.push_back((track, reader.read_boxed_slice_exact(size)?));
         }
         Lacing::FixedSize => {
-            let frames = reader.read_byte()? as usize;
+            let frames = reader.read_byte()? as usize + 1;
             let total_size = block.len() - reader.pos() as usize;
             if total_size % frames != 0 {
                 return Err(Error::DecodeError("mkv: invalid block size"));