Reading Stereo Audio

Hey there, it seems I can't get `decord`'s `AudioReader` to read stereo audio. mono works just fine, but stereo seems to always have something wrong with one of the channels. I wrote a notebook to show what I mean:

https://gist.github.com/nateraw/fcc2bdb9c8738224957c8617c3360445

Am I doing something wrong?

Start with the linked notebook and its AudioReader stereo reproduction, comparing the mono and stereo outputs to identify the channel mismatch. Confirm the expected two-channel result from the example. Done means AudioReader reads stereo audio with both channels correct.

Written by the indexing model from the issue text.