Paul V. Gratz wrote: > On Sunday 22 January 2006 08:29 am, Ben Suffolk wrote: > >>>> No, Ben, I don't. And, as I understand it, this is impossible. Since >>>> we're just passing through a digital signal to the receiver, it's >>>> >>> all up to >>> >>>> the receiver to deal with it. In order to change the volume, we >>>> >>> would need >>> >>>> to decode the audio, sample down the volume, reencode it, then >>>> >>> pass it on >>> >>>> to the receiver. Maybe it's possible, but it certainly is not very >>>> efficient. And, by the way, this is all just speculation. I don't >>>> >>> really >>> >>>> know how it works, but my explanation made sense to me. >>>> >>> And your explanation is more or less correct. If you're passing raw >>> digital >>> audio, its completely raw, you can't controll its volume level. >>> Might be best >>> to let Myth do the audio decoding and pass PCM audio instead of raw >>> digital >>> audio. Could also try to rig up something with an irblaster if >>> you're dead >>> set on having the amp in a different room and passing raw audio. >>> >>> -- >>> Jarod Wilson >>> jarod[at]wilsonet.com >>> >> I though this might be the case, I have to say I don't really know >> about digital audio, but I had hoped that maybe it would be quite >> easy to manipulate it in the digital realm, so not having to convert >> it, just simply dividing each digital value by the volume level. I >> guess not. >> >> I thought maybe I could use an irbalster to swap the inputs on my amp >> between regular 2 channel pcm for tv and music, then have it auto >> switch to 5.1 when you play a dvd, and then switch back again for TV. >> I guess this could be done quite easily with a shell script set as >> the player for the dvd & video playback. Not idea, but would allow >> the osd for volume in TV etc. >> >> Ben >> > > > Actually there is supposed to be a plugin for this in alsa called > "softvol". Check out the bottom of this page: > > http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html > > I messed with it for a while but I've been unable to figure out how to > make it work.... > Paul > > > > ------------------------------------------------------------------------ > > _______________________________________________ > mythtv-users mailing list > mythtv-users@mythtv.org > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users > As a principle for sound quality you dont want to be resampling the vol in the digital domain. You will drop quality as well as loose dynamic range. Leave your AV amp to do this as it will do it in the analog domain AFTER the DAC.
The simple way to do all this is to use an Infrared remote. Programme up the vol control on your remote to move the vol on your av amp only. There's no need to change inputs or devices on your remote. Leave the vol control on the computer side fixed. Mike C _______________________________________________ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
