44.1k vs 48k audio problem

I noticed in the docs it says the roku supports 44.1k and 48k audio. I have a bunch of files that were originally encoded at 44.1, but when they play on the roku box, the audio is sped up and there breaks in it. If I take the same source file and only change the audio to 48k, then the files play fine. Is there somewhere that I need to specify what kind of audio I am sending it in the metadata to make it work, or should it just automatically switch between the 2 sample rates? On a computer the files sound and play fine, its only on the roku that the 44.1k files sound strange.