if is_audio:
smhd_payload = s88.pack(0) # balance
- smhd_payload = u16.pack(0) # reserved
+ smhd_payload += u16.pack(0) # reserved
media_header_box = full_box(b'smhd', 0, 0, smhd_payload) # Sound Media Header
else:
vmhd_payload = u16.pack(0) # graphics mode
if fourcc == 'AACL':
sample_entry_box = box(b'mp4a', sample_entry_payload)
else:
- sample_entry_payload = sample_entry_payload
sample_entry_payload += u16.pack(0) # pre defined
sample_entry_payload += u16.pack(0) # reserved
sample_entry_payload += u32.pack(0) * 3 # pre defined