Mark Lanctot;266822 Wrote: 
> Ah.  Well, not sure what to recommend to Honva then!
> 
> As I indicated, I use MP3Gain - it has an option "-k: automatically
> lower Track gain to not clip audio" and because it has no playback, I
> assume it affects the track gain value written into the tags. 
> Therefore the SB couldn't clip it if it applies the RG tag, assuming
> MP3Gain calculated it correctly.
> 
> On FLACs I use the flac "--replay-gain" option.  I don't believe it has
> any "no clipping" function.

I believe that the difference is that applying replaygain tags will
require the player to be able to read the tags and adjust the gain
accordingly.  Mp3gain, on the other hand, actually writes something to
each frame of the mp3 file that really changes the gain, so the player
need not do anything special other than just play the file.  The
Mp3gain adjustment is reversible (you can back it out as long as when
you applied it you had mp3gain write tags keeping track of what it
did).  So while you can turn replaygain on or off with a capable
player, you have to run mp3gain again for a file if you want to change
the gain.

Therefore, making sure the gain adjustment does not cause clipping must
be done when mp3gain analyzes and writes to the file.  There is no other
option.  Replaygain could implement this at analyze/write tags time or
at playback time, although Foobar does the latter.  I do not know of
any implementation of the former, but would be interested in hearing
about it.


-- 
jeffmeh
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