How to extract metadata from udp stream of a ts file

Hi, i have an udp stream from which i'd like to extract metadata flow. I'm streaming a ts file from vlc media player.
I can stream but i can't receive metadata. I'm using the following code to extract metadata:

```
override fun onTracksChanged(
trackGroups: TrackGroupArray,
trackSelections: TrackSelectionArray
) {
simpleExoPlayer?.addAnalyticsListener(EventLogger(trackSelector))
for (i in 0 until trackGroups.length) {
val trackGroup = trackGroups.get(i)
for (j in 0 until trackGroup.length) {
val trackMetadata = trackGroup.getFormat(j)
if (trackMetadata != null) {
//do something with metadata
}
}
}
}
```

but i don't receive nothing, i need to receive metadata like: duration, in playback title, next and previous program etc...
how can i resolve this issue? Thank you!