Return-Path: From: Marcel Hilzinger To: BlueZ development Date: Thu, 9 Nov 2006 18:43:50 +0100 References: <200611091102.54282.marcel@hilzinger.hu> <20061109104245.GB7085@physik.fu-berlin.de> In-Reply-To: <20061109104245.GB7085@physik.fu-berlin.de> MIME-Version: 1.0 Message-Id: <200611091843.50711.mhilzinger@linuxnewmedia.de> Subject: Re: [Bluez-devel] Quality of a2dp sound Reply-To: BlueZ development List-Id: BlueZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Sender: bluez-devel-bounces@lists.sourceforge.net Errors-To: bluez-devel-bounces@lists.sourceforge.net 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 ju= st > > 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 away > > 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
> - btsco -r -v
> - mpg123 --au - file.mp3 | a2play
Hey, thanks! I tried this once before, but it didn't work. So I gave up. Bu= t = 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 Mac. > > 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 cou= ld > 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 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