[mythtv] Prefer lower-numbered audio stream

[Doug Larrick]

Daniel Thor Kristjansson wrote:
> Most of audio information with ATSC is not in the stream that ffmpeg 
> sees. Even the limited audio descriptor sometimes present in the PMT is 
> jettisoned with the PMT rewriting. I don't think ffmpeg even tries to 
> look at this information, but we don't save it in the recording to 
> begin with.

Yes, that's true, though if needed we could preserve the audio 
information from PMT while rewriting.  The good news is that it *is* 
still present in the AC3 stream itself.  The only use for preserving 
this data in PMT would be for non-AC3 streams (from DVB maybe?)

-Doug
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