Fixing audio sync in .MP4 file?

Hello, I need to set audio delay in existing MP4 video file. Is that possible that I remux with delay parameter at audio track? If I look at MP4Box options, there's -delay allowing this so I assume MP4 format supports delay at track levels. Now the question is how do I simply remux with either MP4Box or other utility with original MP4 file as input. Or worse, to fully demux all tracks from MP4 fille including subtitles and compose from scratch. I got not too familiar with MP4Box switches, any help?

you can use ... Code:

Thanks,, I'll give a try. I need to apply individual delay for each track (2 audio tracks)3