Missing tags for AV components

[milo1000]

I am using gstreamer 1.8.x on Broadcom embedded platform

I try to obtain components tags' metadata as in playback-tutorial-1.c
example (multilingual player), playing DASH content.
Tags are retrieved by: 
g_signal_emit_by_name (data->playbin2, "get-video-tags", i, &tags);

Unfortunately, most of the time particular tags, like language or codec are
missing, in log I see

 0:00:02.503311493 21657 0x64b0f0 DEBUG GST_PADS gstpad.c :
5299:gst_pad_push_event_unchecked:<'':decodepad6> Dropping event tag because
pad is not linked

My question is: what can be source of such behavior or, what to check next?
Any hints?

best
milosz



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