wrong time duration displayed while playing mp4 file

[taklubaba]

Hi,
I try to play an mp4 file with avcC box, in Media Player Classic and it shows the correct time duration of the mp4 file.
Now if I remove the avcC box then the time duration shown is some garbage value.


Does avcC box contain the information for time duration?
Thanks

[bond]

why would you want to remove the avcc?