Android MediaCodec issue on Alcatel OneTouch 7025D

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I'm developing mp3 music player for Android. I use MediaCodec for decoding mp3 and AudioTrack for playing.
My engine works fine for all phones / tablets. But on Alcatel OneTouch 7025D it works slow and wrong.
After some test I investigated, that MediaCodec give me to large buffer: 46080 (on other devices it is 4608).
By the way Alcatel OneTouch 7025D (Android 4.2.1) has new(2013) CPU: Quad-core 1.2 GHz Cortex-A7.
So what could be the problem?

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