Audiomixer plugin can't play to end time

[王建能]

My program use audiomixer play two wav file, and I try to change current
time in playing.
I met a issue. The program will can't play to end time.

For example, a music file is 20 second length, and program stop time at 16
second.
I have a test example for audiomixer program placed in the annex.

Ken
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