how to deal with multi audio tracks ?

[wei qinbo]

Hi guys,
I'm trying to play movies which has multi audio tracks. What i would like to
do is to handle these audio tracks: switch to one audio track or mix them
together during playback.

I tried to use adder element, it' seems work when mixing. but i don't know
how to switch audio when playback. I just unlinked one audio decoder and the
adder to disable the audio track. but then all audios are gone:(

Help please~


Regards,
ToTo
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