[mythtvnz] Equalizing audio levels in mythtv

[feadog]

I have noted some users have found varying audio levels between channels
annoying. The inclusion of a ladspa compressor/limiter filter has helped
me enormously on a eeepc netbook running mythtv-frontend dvb-s.

The information was gleaned from the URL
http://alsa.opensrc.org/index.php/LADSPA_plugins

As in my case, create the file .asoundrc in your home folder with the
contents;

**********start of file*********
pcm.ladcomp {
      type plug
      slave.pcm "ladcomp_compressor";
  }
pcm.ladcomp_compressor {
      type ladspa
      slave.pcm "ladcomp_limiter";
      path "/usr/lib/ladspa";
      plugins [
          {
              label dysonCompress
              input {
                  #peak limit, release time, fast ratio, ratio
                  controls [0 1 0.5 0.99]
              }
          }
      ]
  }
pcm.ladcomp_limiter {
      type ladspa
      slave.pcm "plughw:0,0";
      path "/usr/lib/ladspa";
      plugins [
          {
              label fastLookaheadLimiter
              input {
               #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release
time (s) 0.01 -> 2
               controls [ 0 0 0.8  ]
              }
          }
     ]
  }

******end of file*****

Install the package swh-plugins
sudo apt-get install swh-plugins

In mythfrontend change audio output device from ALSA: to ALSA:ladcomp
in settings/general/audio output device.

restart alsa or reboot

The settings in .asoundrc may be a bit aggressive for some installations
but are great for the netbook's tiny speakers. Change the settings to
suit.

I hope I haven't left anything out! Assumes alsa installed.

Noel Sheridan

-------------- next part --------------

pcm.ladcomp {
      type plug
      slave.pcm "ladcomp_compressor";
  }
pcm.ladcomp_compressor {
      type ladspa
      slave.pcm "ladcomp_limiter";
      path "/usr/lib/ladspa";
      plugins [
          {
              label dysonCompress
              input {
                  #peak limit, release time, fast ratio, ratio
                  controls [0 1 0.5 0.99]
              }
          }
      ]
  }
pcm.ladcomp_limiter {
      type ladspa
      slave.pcm "plughw:0,0";
      path "/usr/lib/ladspa";
      plugins [
          {
              label fastLookaheadLimiter
              input {
               #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release time (s) 0.01 -> 2
               controls [ 0 0 0.8  ]
              }
          }
     ]
  }