Examples — MoQT draft-09 §8.5.

Sending a subgroup on one stream:

Stream = 2

SUBGROUP_HEADER {
  Track Alias = 2
  Group ID = 0
  Subgroup ID = 0
  Publisher Priority = 0
}
{
  Object ID = 0
  Extension Headers Length = 0
  Object Payload Length = 4
  Payload = "abcd"
}
{
  Object ID = 1
  Extension Headers Length = 0
  Object Payload Length = 4
  Payload = "efgh"
}

Sending a group on one stream, with the first object containing two Extension Headers.

Stream = 2

STREAM_HEADER_GROUP {
  Subscribe ID = 2
  Track Alias = 2
  Group ID = 0
  Publisher Priority = 0
}
{
  Object ID = 0
  Extension Headers Length = 33
    { Type = 4
      Value = 2186796243
    },
    { Type = 77
      Length = 21
      Value = "traceID:123456"
    }
  Object Payload Length = 4
  Payload = "abcd"
}
{
  Object ID = 1
  Extension Headers Length = 0
  Object Payload Length = 4
  Payload = "efgh"
}