Re: [Bluez-devel] Quality of a2dp sound

["Thomas Kear" <thomas.kear@gmail.com>]

You should be able to use the command line encoding tools in their
decode modes to play most formats.  For example:

flac -c -d [file] | aplay
lame --decode [file] - | aplay
oggdec -c [file] | aplay  (not so sure about this one, some command
switches are like flac, some aren't)

Should stretch to some other formats too, wavpack springs to mind
(although i can't remember its command line syntax).


On 10/11/06, Marcel Hilzinger <mhilzinger@linuxnewmedia.de> wrote:
> Am Donnerstag, 9. November 2006 11:42 schrieb Adrian Glaubitz:
> > Hi Marcel !
> >
> > Marcel Hilzinger schrieb:
> > > Hi,
> > >
> > > I made some tests with bluetooth stereo headsets and a2dpd.
> > > I must confess, I'm impressed by the easy use of a2dpd! Thanks, it's =
just
> > > great.
> >
> > Yes, the usage is very simple, indeed. Once I figured out how to use
> > passkey-agent, the connection worked immediately ;).
> >
> > > But I'm not impressed by the audio quality. Its quite noisy and far a=
way
> > > from the quality of normal wireless headphones. Headset was a Jabra
> > > BT620s. I tried with different dongles, but the dongle seems to make =
no
> > > difference.
> >
> > My problem with the audio quality and a2dpd is, that the quality is set
> > to telephone quality only (8kHz, Mono) though my headset can do up to
> > 44,1kHz Stereo (SONY VGP-BRM1D) and a2dpd even displays 44,1kHz. When
> > using a2play I can listen in 44,1kHz quality, so this is an issue with
> > a2dpd for me (but a2play plays the MP3s with higher speed, so they sound
> > high-pitched). Also the sound is chopped very often with a2dpd, so this=
 is
> > no use for me at the moment :(.
> >
> > > Questions:
> > > is this a problem of the technology?
> >
> > I don't think so, this is rather due to the fact that btsco is still in
> > Alpha status of development.
> >
> > > is it a problem of bluez?
> >
> > No, I'd rather blame btsco. (I tried different kernel versions, 2.6.17.9
> > and 2.6.19-rc5 and the most recent bluez-utils version).
> >
> > > did I something wrong?
> >
> > Have you tried a2play instead ? Do this:
> >
> > - hcitool scan
> > - passkey-agent <code> <address>
> > - btsco -r -v <address>
> > - mpg123 --au - file.mp3 | a2play <address>
>
> Hey, thanks! I tried this once before, but it didn't work. So I gave up. =
But
> now it works like a charm and yes, sound quality is better.
>
> However, with this solution I can only play MP3 files. But most of my
> collection is in OGG-Vorbis. And how to skip to next/previous track?
>
>
> > > did anybody compare the quality on Windows? I tried to compare with M=
ac.
> > > But as Mac OS X cannot do a2dpd, it's even worse on Mac.
> >
> > I was not able to use my headset in Windows, Windows doesn't give me any
> > options for choosing the headset as an audio output-device, though I can
> > to the headset successfully. On 2 Macintosh Mini (Intel and PPC) with OS
> > 10.4 I was able to connect to the headset without any problems, and I c=
ould
> > choose my headset for all the sound-output so I was able to listen to
> > iTunes via the headset. The only drawback on the Mac is, that the
> > quality is limited to 8000Hz, 16 Bit mono (and the Audio Utility won't
> > let me choose any better quality, though the headset supports this).
> Mac does not support a2dp, that's why the quality is bad.
>
>
> --
> Mit freundlichen Gr=FC=DFen,
> Marcel Hilzinger
>
> Linux New Media AG
> S=FCskindstr. 4
> D-81929 M=FCnchen
> Tel: +49 (89) 99 34 11 0
> Fax: +49 (89) 99 34 11 99
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job ea=
sier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=
=3D121642
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>


-- =

Thomas Kear
thomas.kear@gmail.com
+6421996486

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easi=
er
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D1=
21642
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel