Comment 50 for bug 602934

(In reply to comment #37)
> I don't see we can do a "Stereo Tracks to Mono" on an M4A imported via libfaad
> as it would take too long. But could or should you do some hackage in our
> FFmpeg code so that it imports "first time" as mono? I think the answer to that
> is "is this a libfaad bug"? It appears that upMatrix for "implicit signalling
> of PS" is deliberate, unless the commenting is the bug. Certainly users would
> prefer if mono AACs came in as mono irrespective of decoder and if so we don't
> have to release note. Apple accepts mono AAC as part of its standard doesn't
> it?
>
Another option would be to use libfaac for encoding (Windows and OSX) and use
the native FFmpeg aac decoder instead of libfaad. That configuration is
certainly supported.

Yet another (and I'm trying it now), would be to have both the native and
libfaac/libfaad enabled (Windows and OSX). It may be possible to present both
options to the user. It's certainly possible via the ffmpeg command, but via
the custom ffmpeg options dialog, it gets a bit confusing (read that as if I'd
said "I haven't figured it out yet". :-))

The first option is definitely possible though...well, I'll be testing it in a
few minutes anyway. :-)

Leland