On Thu, 15.11.07 14:55, Tanu Kaskinen (tanuk at iki.fi) wrote: > On Wed, Nov 14, 2007 at 09:56:19AM -0800, Dennis Fleming wrote: > > I have noticed that in pa_mix streams are clipped when they exceed the > > threshold. Has there been any discussion on normalizing the output > > rather than clipping? Or am I looking in the wrong place. > > If I understood correctly, you would like PA to lower the > volume whenever the sample values get too high while mixing. > Should it then raise the volume back to original level after > there has been quieter signal for a few seconds or something > like that? I'd say that automatically turning the volume up > and down isn't the solution. I might accept automatic > "normalizing", if the volume stays down after there's been > need to lower it. But that's not much better than just > adjusting the stream volumes "manually" so that they don't > clip in the first place. I think normalizing a mixed stream is perfectly ligitimate. Don't forget that normalization through DRC would only take effect when otherwise we'd clip. So the option you have is not DRC vs non-DRC. But it is clipping vs. DRC. And in this case DRC is certainly the smaller evil. > I put "manually" inside quotation marks, because the volumes > can be adjusted automatically to a predefined level using > module-match. I use it to set the default volume of all > streams to about 50%. Maybe 50% could be the default, > because at 100% clipping is quite probable with multiple > streams. Uh. That way you practically decrease the bit depth of your audio output to 15 bit. (Unless you happen to have a 24 bit soundcard) Not a very good idea for most people. Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4
