diff --git a/src/muxer/hls/mp4/atoms.rs b/src/muxer/hls/mp4/atoms.rs
index 438c60b..89f3837 100644
--- a/src/muxer/hls/mp4/atoms.rs
+++ b/src/muxer/hls/mp4/atoms.rs
@@ -1,13 +1,13 @@
 struct WindowMatrix {
-    A: u32,
-    B: u32,
-    U: u32,
-    C: u32,
-    D: u32,
-    V: u32,
-    X: u32,
-    Y: u32,
-    W: u32,
+    a: u32,
+    b: u32,
+    u: u32,
+    c: u32,
+    d: u32,
+    v: u32,
+    x: u32,
+    y: u32,
+    w: u32,
 }
 
 struct MOOV {
@@ -19,16 +19,40 @@ struct MOOV {
 struct MVHD {
     version: u8,
     flags: u32,
-    create_time: u64,
-    modify_time: u64,
+    create_time: u32,
+    modify_time: u32,
     time_scale: u32,
-    duration: u64,
+    duration: u32,
     playrate: u32,
     volume: u16,
     matrix: WindowMatrix,
     next_track_id: u32,
 }
 
-struct TRAK;
+struct TRAK {
+    tkhd: TKHD,
+    edts: EDTS,
+    mdia: MDIA,
+}
+
+struct TKHD {
+    version: u32,
+    flags: u32,
+    create_time: u32,
+    modify_time: u32,
+    track_id: u32,
+    time_scale: u32,
+    duration: u32,
+    layer: u16,
+    alt_group: u16,
+    volume: u16,
+    matrix: WindowMatrix,
+    width: u32,
+    height: u32,
+}
+
+struct EDTS;
+
+struct MDIA;
 
 struct MVEX;