diff --git a/main.rs b/main.rs
index e31db6b..27ba67e 100644
--- a/main.rs
+++ b/main.rs
@@ -40,10 +40,10 @@ fn main() -> Result<(), std::io::Error> {
     let mut my_file = BufWriter::new(File::create(output_file)?);
     writeln!(&mut my_file, "YUV4MPEG2 W{} H{} F{}:1 Ip A1:1 C444", WIDTH, HEIGHT, FPS)?;
 
-    writeln!(&mut my_file, "FRAME");
     for _ in 0..FPS {
+        writeln!(&mut my_file, "FRAME")?;
         for _ in 0..WIDTH*HEIGHT {
-            let mut contents = [0u8; 3];
+            let contents = [0u8; 3];
             my_file.write(&contents)?;
         }
     }