On 28.06.2017 01:11, Russell Coker via luv-main wrote:
Is there a way of balancing loudness of different mp4 files? While
it's
impossible to do this perfectly (there is no general agreement on how
to
measure it) it is possible to give a good approximation.
My music video collection that I downloaded from youtube has videos of
significantly different loudness, so when I watch a selection of videos
that
suit my mood with mplayer I have to change the system volume every few
videos
because I get to one that's either too loud or too quiet for the
current
settings.
I'd like to run a script across my video collection to get the average
loudness of each video so the mplayer softvol setting can be adjusted
to
compensate. Then of course I'd do some manual adjustment like
increasing the
volume of The Divinyls and The Angels.
Vorbisgain sort of does this for ogg files (from the man page).....
Vorbisgain calculates the ReplayGain values for the named Ogg Vorbis
input files
and writesback the result in the form of tags (comments) in the file.
These values
can be used by a play-back program to maintain a uniform sound level
during play. (See http://www.replaygain.org/
Not very many players support this though, I put this up as it may give
any one interested a starting point for further work as it clearly has
already been considered an issue.
For any music I download, I convert it to an ogg file with Audacity but
first use Effect>Amplify to normalise the gain, in order to get a
reasonably close range of loudness. I use Audacity rather than one of
the converter programs particularly for its Amplify command.
Lindsay
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