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This should better prepare us to make "source ed" into
"source <av|sox> ed" and set per-source priorities.
We also now treat @env consistently for all per-source commands
(such as soxi/avprobe) so we can be sure we're using the same
installation of sox or libav if using a non-standard PATH, or if we
want to set AV_LOG_FORCE_NOCOLOR
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We need to tell sox to use and resample to the _player_ format
instead of the source format. Otherwise 48000 Hz audio (common for
video?) sounds very slow when attempting to play back on the default
44100 Hz. It is also likely preferable to choose the audio stream
which matches the player channel count instead of letting sox
automatically invoke the remix effect.
Before this change, playing 6-channel, 48000 Hz source into a sink
expecting stereo, 44100 Hz is rather disturbing...
While we're at it, clarify the spawn code for the sox source, too.
We can drop the test_format_from_file test now, since
it's probably overkill at this point.
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avconv is capable of outputting to the .sox format, greatly
simplifying our life as it enables us to easily apply sox
effects on a per-source file basis.
dtas-sourceedit and the "source" protocol commands will need
to change to support internal priorities (like sink).
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