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encoded AAC file plays too fast

We encoded AAC files using AAC encoder on DM368.

For the video, the .264 file plays well at normal speed.
but for audio, we have problem that AAC file plays too fast at double speed
and its playing time is almost half of actual one.

Our engineer changed the sampling rate, bitrate, and other options in AAC encoder
but there's no change in speed.

We didn't have neccessity to change the options in the example code before facing this problem
because they are given from TI.
There was no reason to expect that the given code contains any chipmunk playing option by default.

Is there any critical option related to play speed?
How do I solve this problem?

Thanks in advance for your help.