Audio track is not sequence when using playbin

[hungbattran]

Hi all,

I'm using c++ to make a mediaplayer. Operation of mediaplay is based on API
of GStreamer to control PLAYBIN directly. And I'm facing a issue  that when
I switch audio track (.MVK that embedded 6 audio tracks numbered from 1-6)
that is not sequence. Example, CLIP has audio track 1,2,3,4,5,6 and track 1
has Flags Default but default PLAYBIN play track 6. Then switching audio
track is 3->5->1->2->4.

Now I want to switch these audio in order 1->6.

GStreamer pipeline: Using PLAYBIN
CLIP: .MKV container

Finnally, my question: 
1. How GStreamer stored audio track ? (I tried to investigate PLAYBIN source
code but not lucky to me)
2. How to know which track is 1,2,3,4,5,6 in .MKV ? Currently, I can get
information of .MKV (almost thing by code c parser).
3. Any idea for switch audio track sequence ? I tried to use filesrc and it
worked when I change pipeline it means when I want to switch audio I must
stop current pipeline and start new pipeline with new d.audio_1. It's not my
expection.

Thank so much. Hope any help from every one.






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