From a38b0561f097d7ec08a784520bd74019dc201d70 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Tue, 31 Mar 2026 17:48:03 +0200
Subject: [PATCH] movmuxer: fix writing co64 atom

---
 nihav-commonfmt/src/muxers/mov/mod.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/nihav-commonfmt/src/muxers/mov/mod.rs b/nihav-commonfmt/src/muxers/mov/mod.rs
index 467cd9a..8d21582 100644
--- a/nihav-commonfmt/src/muxers/mov/mod.rs
+++ b/nihav-commonfmt/src/muxers/mov/mod.rs
@@ -185,6 +185,7 @@ impl ChunkAccount {
             let co64 = AtomMarker::start(bw, b"co64")?;
             bw.write_byte(0)?;  // version
             bw.write_u24be(0)?; // flags
+            bw.write_u32be(self.offsets64.len() as u32)?;
             for &off in self.offsets64.iter() {
                 bw.write_u64be(off)?;
             }
-- 
2.39.5