cliveb;381591 Wrote: > The bug that was fixed (in 7.3.1, I believe) is this one: > http://bugs.slimdevices.com/show_bug.cgi?id=5119 > > To briefly summarise: if the replaygain vaue is positive and applying > that positive gain would cause clipping, then it should be scaled back > to prevent clipping. (A typical example would be classical music which > has a low average volume but has a few peaks at or around 0dB). > > However, the screen shot posted by blkmagik98 appears to show something > has gone horribly wrong. The album gain is -5.4dB, and it says it's been > adjusted to -18.06dB to prevent clipping. If the replaygain is negative > (as in this case), then clipping cannot be introduced, so no adjustment > should be made. > > Assuming the bug fix is applying the expected calculation based on the > replaygain tags, then it suggests the file has a REPLAYGAIN_ALBUM_PEAK > tag value of 8. That value should always be 1 or less (except in some > pathalogical cases with MP3, where it might be a little bit more than > 1). You should check the value of this tag with a suitable program > (such as MP3Tag, Foobar2000, etc). If it is 8, then whatever program > added the replaygain tags has made an error. If it's 1 or less, then > the error appears to have been made either during the SqueezeCenter > scan or in the clipping prevention calculation that was added in the > bug fix.
Well spotted Clive! Some files clip right off the CD and a negative RG value is a clue that they -might-, so dropping the value down further might avoid clipping. MP3Gain, for example, supports writing gain tags that represent the maximum gain before clipping occurs, and if clipping occurs off the CD, these values will be negative. However -18 dB is extreme and yes, if it's derived from REPLAYGAIN_ALBUM_PEAK only then something is quite wrong! -- Mark Lanctot Current: SB2, Transporter, Boom (PQP3 - late beta) Stored: Boom (PQP1 - early beta), SBC (beta - no battery) Sold: SB3, Duet ------------------------------------------------------------------------ Mark Lanctot's Profile: http://forums.slimdevices.com/member.php?userid=2071 View this thread: http://forums.slimdevices.com/showthread.php?t=57543 _______________________________________________ ripping mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/ripping
