Issue in adding album cover to a mp4 file

Trying to add album cover to a song but the embedded cover is not recognizing
I tried below approach

```
resp, err := http.Get(coverURL)
defer resp.Body.Close()
coverData, err := io.ReadAll(resp.Body)
err = addMeta(mp4.BoxType{'c', 'o', 'v', 'r'}, coverData)
```

Maybe I should give JPEG format also as a parameter? please help