[pulseaudio-discuss] PA volume effects
lennart at poettering.net
Fri May 1 08:47:14 PDT 2009
On Fri, 01.05.09 16:39, Colin Guthrie (gmane at colin.guthr.ie) wrote:
> 'Twas brillig, and Daniel Mack at 01/05/09 12:09 did gyre and gimble:
>> On Mon, Apr 27, 2009 at 06:18:59PM +0200, Daniel Mack wrote:
>>> I'm observing strange audio artefacts with my audio driver which seem to
>>> be related to audio material overamplification. IOW, the effect is only
>>> audible at waveform peaks. When I attenuate the playback volume
>>> pavucontrol, things get a lot worse - horrible distortion all over
>>> the place, even in more quite audio sections.
>>> Also, when comparing the audio output of 'aplay -Dpulse foo.wav' with
>>> 'aplay -Dplughw foo.wav', it is clearly audible that PA adds some kind
>>> of amplification to the material (I would guess ~3dB), even though all
>>> GUI accessible levels are set to 100%.
>> Just for the records: this is fixed now in upstream git. Thanks a lot!
> Is this a specific change since 0.9.15 release? If so do you know if
> there are specific commits that can be backported to a 0.9.15 build to
> address this.
> I'm thinking for packagers here who are not allowed to just upgrade
> things willy nilly, but want to provide bugfixes?
> Lennart is pretty good at letting people know when he pushes specific
> commits into the fedora package which is usually a good indicator, but
> if you've got a heads-up, it'll keep us all on our toes :D
Lennart Poettering Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/ GnuPG 0x1A015CC4
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