I've perused the man page, Google and closed issues, I cannot find anything.

My source video contains this:
```
ffprobe 1.mp4 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  Metadata:
    creation_time   : 2019-04-09T06:01:42.000000Z
    location        : +12.3456+078.9012/
    location-eng    : +12.3456+078.9012/
    com.android.version: 11
    com.android.capture.fps: 60.000000
```

I've tried:
`MP4Box -udta com.android.version:type=name:str=9 newfile.mp4` - doesn't work.
`MP4Box -itags com.android.version:9 newfile.mp4` - doesn't work.

So, how can I add metadata to an MP4 file?
How to add metadata to an MP4 file?
This is a GitHub Issue
repo:gpac
owner:gpac
Title : How to add metadata to an MP4 file?
Issue date:

--- start body ---
I've perused the man page, Google and closed issues, I cannot find anything.

My source video contains this:
```
ffprobe 1.mp4 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  Metadata:
    creation_time   : 2019-04-09T06:01:42.000000Z
    location        : +12.3456+078.9012/
    location-eng    : +12.3456+078.9012/
    com.android.version: 11
    com.android.capture.fps: 60.000000
```

I've tried:
`MP4Box -udta com.android.version:type=name:str=9 newfile.mp4` - doesn't work.
`MP4Box -itags com.android.version:9 newfile.mp4` - doesn't work.

So, how can I add metadata to an MP4 file?
--- end body ---
