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Topic: Replaygain values truncated to 6 decimal places (Read 3897 times) previous topic - next topic
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Replaygain values truncated to 6 decimal places

I was comparing the fb2k replaygain feature with the FLAC 1.1.0 encoder (via CDex) and metaflac (stand alone). Both flac and metaflac generate 8 decimal place values, while fb2k's (0.7.6) ReplayGain Scanner v1.2 generates a truncated 6 decimal place value.

I would like to know if there is any practical impact of this truncation (note that the scanner truncates, not rounds, the number).

Note that I have tried googling and seraching this forum for an answer, but couln't find anything.

Any help would be appreciated.
"There is no point in saving WAV... unless you have a huge HD in a very slow computer" - Jan S. (WAV or FLAC, Space No Problem)

Replaygain values truncated to 6 decimal places

Reply #1 –
Probably not.  Truncation of the peak value might cause some distortion at the peaks in a naive limiter.  Rounding up is probably safer.  libFLAC does whatever snprintf() does when converting float to string; it might also truncate.

Josh

Replaygain values truncated to 6 decimal places

Reply #2 –
Thanks Josh.

I'll continue to use the FLAC encoder to add the replaygain values. (Just the purist in me:-)
"There is no point in saving WAV... unless you have a huge HD in a very slow computer" - Jan S. (WAV or FLAC, Space No Problem)

Replaygain values truncated to 6 decimal places

Reply #3 –
but my point was that flac might do the same thing (truncate, although to higher resolution).  and you should try for yourself, but you probably can't hear a 0.000001 dB difference in the gain value.

Josh

P.S. I doubt foobar2000 and other well-written player code trusts the peak value to have perfect resolution, so it won't have a detrimental effect anyway; using either one is fine.