Hi team,

We found in the Apple HLS spec, https://developer.apple.com/documentation/http_live_streaming/http_live_streaming_hls_authoring_specification_for_apple_devices
There is a statement regarding `ludt`:
```
2.19. In fMP4 files, you SHOULD provide loudness information by way of a loudness box ('ludt'). When present, the loudness box takes precedence over any loudness information in the audio stream.
```

But seems Bento4 doesn't support `ludt` yet. I tried to dump atoms of a xHE-AAC encoded mp4 file with mp4dump, but didn't find `ludt`.

So does Bento4 support `ludt`?  If yes, could you share an example mp4 file with `ludt` data?

Thanks!
About loudness atom 'ludt'
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : About loudness atom 'ludt'
Issue date:

--- start body ---
Hi team,

We found in the Apple HLS spec, https://developer.apple.com/documentation/http_live_streaming/http_live_streaming_hls_authoring_specification_for_apple_devices
There is a statement regarding `ludt`:
```
2.19. In fMP4 files, you SHOULD provide loudness information by way of a loudness box ('ludt'). When present, the loudness box takes precedence over any loudness information in the audio stream.
```

But seems Bento4 doesn't support `ludt` yet. I tried to dump atoms of a xHE-AAC encoded mp4 file with mp4dump, but didn't find `ludt`.

So does Bento4 support `ludt`?  If yes, could you share an example mp4 file with `ludt` data?

Thanks!
--- end body ---
