how to apply replay gain while converting mp3 speech files to opus 2017-10-14 12:35:55 Hi I am Rupesh from India and I have some mp3 files which are speeches given by someone. These files are recorded at 64 kbps and sample rate from 32000hz and 40000hz. These mp3 files are at very low volume.I want to convert these files into opus.Previously I have converted these files successfully into opus using db power amp batch converter. I have converted using channel's set to 1 ie., mono and resampling set to 48000hz.When I listened the converted file's audio quality is good but volume is very low.Someone suggested to apply replay gain directly to mp3 files and then convert to opus. Which is best between applying replay gain to mp3 files directly after that converting to opus or applying replay gain while transcoding process.I want to apply replay gain for each file say 10 db individually not to album.Please suggest how to apply replay gain to mp3 files and store replay gain information in them permanently. Are there any specialized tools for changing volume if so can you suggest which is the best.Regards,Rupesh.