diff --git a/src/demux/flv.rs b/src/demux/flv.rs
index 80239e6..b023383 100644
--- a/src/demux/flv.rs
+++ b/src/demux/flv.rs
@@ -40,7 +40,7 @@ impl FLVReader {
     fn skip_init_header(&mut self) -> Result<(), Box<dyn Error>> {
         let mut rest_of_header = [0u8; 5];
         self.stdin.read_exact(&mut rest_of_header)?;
-        let head_offset = u32::from_be_bytes(rest_of_header[1..].try_into()?) as usize + 4;
+        let head_offset = u32::from_be_bytes(rest_of_header[1..].try_into()?) as usize - 9 + 4;
         let mut skip_header_extra = vec![0u8; head_offset];
         self.stdin.read_exact(skip_header_extra.as_mut_slice())?;
         return Ok(());