Hi All,
had a bizarre thing occur today, doesn’t usually happen to be honest, but i batch convert wav’s to mp3 in both RX or reaper and check in R128x
(its for QC reasons that I cannot use wavelab mp3 export, as the total length over Longform usually come up short compared to the wav versions),
my clients check wav lengths against mp3 lengths in reaper, and QC loudness and DTPeaks in R128x
everything is at the correct loudness for spec, with the correct true peaks with the wavs, 16bit 44.1k mono
I had a 3 files which the true peaks scanned louder in R128x after converting to 320kb cbr mp3 in reaper (lame, R8brain), and with 192kb cbr had about 7-8 which scanned louder, which took them out of spec
is there any particular reason for this to happen? I rarely see an issue, and usually all is well, but for some reason regardless if they went through RX (even with a loudness process) or Reaper (just straight convert) for this job I had this discrepancy
I did try the WL batch convertor too just incase and also had a similar result (although lesser, but of course I could not use)
I know it’s not strictly WL related, but could anyone shed any light technically? I presume its to do with the way MP3s are encoded from the wav’s, or the contained audio within it when reducing the quality it can adjust the DTP’s, or I guess it could be just the differing program’s ways of reading the files
