From 81486a60efa18a2771a51dc73a2b7adde8ab51f4 Mon Sep 17 00:00:00 2001
From: Kubo Ryosuke <sunfish-shogi@users.noreply.github.com>
Date: Tue, 26 Apr 2022 02:43:52 +0900
Subject: [PATCH] fix README.md

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 8c32a67..4a60c4a 100644
--- a/README.md
+++ b/README.md
@@ -46,12 +46,12 @@ _, err := mp4.ReadBoxStructure(file, func(h *mp4.ReadHandle) (interface{}, error
 
 ```go
 // extract specific boxes
-boxes, err := mp4.ExtractBox(file, nil, mp4.BoxPath{mp4.BoxTypeMoov(), mp4.BoxTypeTrak(), mp4.BoxTypeTkhd()})
+boxes, err := mp4.ExtractBoxWithPayload(file, nil, mp4.BoxPath{mp4.BoxTypeMoov(), mp4.BoxTypeTrak(), mp4.BoxTypeTkhd()})
 if err != nil {
    :
 }
 for _, box := range boxes {
-  tkhd := box.(*mp4.Tkhd)
+  tkhd := box.Payload.(*mp4.Tkhd)
   fmt.Println("track ID:", tkhd.TrackID)
 }
 ```