Ok, here's the breakdown:
- Spotify is sending 320kbps data to the spotty helper. This data is
afaik OGG encoded.
- The spotty helper would take these 320kbps OGG data and decode it to
raw 1.4Mbps PCM data.
- The Spotty plugin would in turn take these 1.4Mbps PCM data and
transcode them to FLAC to save some bandwidth when streaming to the
device. FLAC is lossless compression. While it would save about 40-50%
of the volume, the data when decoded to PCM on the device again would
be the same PCM data that Spotty originally received from the spotty
helper. But the bandwidth would be about half the 1.4Mbps, which gives
those 700kbps.
By disabling the PCM -> FLAC decoding you save a few CPU cycles at the
cost of more network traffic in your local network. In most cases this
really doesn't matter, as most systems have enough CPU and bandwidth.
But the data eventually played on the device would be the exact same as
the decoded OGG stream as received from Spotify. It's just been
transcoded a few times, resulting in different bitrates :-).
Michael
http://www.herger.net/slim-plugins - Spotty, MusicArtistInfo
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