BUG - Low quality audio over Bluetooth headphones

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drunkensailor Offline
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Joined: Sep 2014
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Post: #1
I've got a set of bluetooth headphones that work fine with OS X, but as soon as XBMC starts playing a file, the quality goes to crap and the Bluetooth audio codec gets changed to SCO from SBC. Before I play a file, the UI audio in XBMC works just fine over the headphones. Quitting XBMC restores the better codec.

I can't figure it out at all. I've tested in 14.0 alpha 3, and the issue persists.

System specs:
Mac mini (Mid 2011), 10.9.4, XBMC 13.2.

Any ideas? I'm at my wits end...

Thanks!
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drunkensailor Offline
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Joined: Sep 2014
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Post: #2
I was able to work around this by forcing XBMC to use the "Fixed" output configuration, with sampling rate limited to 44.1 kHz.

Irritating, and bizarre.
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Memphiz Offline
Team-Kodi Developer
Posts: 11,219
Joined: Feb 2011
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Location: germany
Post: #3
Not so bizarre - XBMC selects best match - if your source is 48000 hz and your audio device (the headphones) suggest they support it - it might just select it. But 48000hz also results in more data sent which might be to much for the bluetooth bandwidth - so the quality is reduced.

Just really guessing here - but why not?

AppleTV2/iPhone/iPod: HowTo find debug logs and everything else which the devs like so much: click here
HowTo setup NFS for XBMC: Wiki NFS
HowTo configure avahi (zeroconf): Wiki Avahi
READ THE IOS FAQ!: iOS FAQ
(This post was last modified: 2014-09-04 17:13 by Memphiz.)
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psacc Offline
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Post: #4
(2014-09-04 17:01)drunkensailor Wrote:  I was able to work around this by forcing XBMC to use the "Fixed" output configuration, with sampling rate limited to 44.1 kHz.

Irritating, and bizarre.

Same issue here. I can confirm that your solution works. I think this is somewhat related to bluetooth devices that offer multiple audio profiles (headphones and high quality audio).

Hoping it will be resolved soon.

Thanks!
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Memphiz Offline
Team-Kodi Developer
Posts: 11,219
Joined: Feb 2011
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Location: germany
Post: #5
I don't know how this should be solved on my side tbh.

AppleTV2/iPhone/iPod: HowTo find debug logs and everything else which the devs like so much: click here
HowTo setup NFS for XBMC: Wiki NFS
HowTo configure avahi (zeroconf): Wiki Avahi
READ THE IOS FAQ!: iOS FAQ
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calutio Offline
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Joined: Jun 2014
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Post: #6
Fixed. Thanks a lot.
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