[mythtv] Audio level normalization

Joel Feenstra joelf at altelco.net
Mon Aug 25 12:49:15 EDT 2003

I have the same problem with the volume of tv-vs-music. The volume's 
should be independant, but they are both saved to the same setting in 
the database. As for the explosions, the audio would probably need to be 
compressed more than normalized. That would bring all the audio to the 
same level. Normalizing just brings the highest spot up to zero.

Joel Feenstra

Roy Hooper wrote:
> Reza Naima wrote:
>> I'm keen to add some code to normalize audio levels -- either before
>> encoding -- or during playback.  I'm sick of having to constantly adjust
>> the volume at night so as not to disturb others sleeping in the house
>> whenever an explosion goes off in some movie -- only not to be able to
>> hear the dialog in the next scene.  I was wondering if there was any
>> other interest for this feature, and peoples opinions on where in the
>> code this should be inserted..
> I'm definitely interested.  This is a problem for me as well ... as is 
> the fact that MythMusic's volume level is almost double the volume level 
> of MythTV even with line in set to max volume.
> I would think there's two places that normalization code could go -- 
> during recording/transcoding, or during playback.  For best results, 
> though, I suspect you'll probably want something running during record 
> to keep periodic min/max level statistics (say once per second).. Those 
> stats can then be used to perform normalization during playback on-demand.
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