usenfixit

I wanted to test if MP3 encoding directly from CD or from extracted wma lossless gives the same result. answer no. What I did. 1/ With Switch Sound File Converter v 2.01, convert a CD track to MP3 VBR128-320kb joint stereo highest quality(0) and name it 01 VBR128-320kb.mp3 2/ With Windows Media Player 11 extract the same CD track in WMA lossless mode, resulting file is 01 WMP11.wma Then use Switch on that WMP11.wma to convert to MP3 with same parameters, result is 01 WMP11.mp3 3/ With JetAudio 7 extract the same CD track in WMA lossless mode, resulting file is 01 JetAudio.wma Then use Switch on that 01 jetAudio.wma to convert to MP3 with same parameters, result is 01 JetAudio.mp3 4/ With MP3TagTools, remove all ID tags(v1&2) 5/ With Media Tagger, remove all wma tags. 6/ Compute hashing values (SHA256) Well that's the result 01 JetAudio.wma & 01 WMP11.wma have the same hashing result - OK, so JetAudio & WMP providing same encoding 01 JetAudio.mp3 & 01 WMP11.mp3 have the same hashing result - OK, normal has sources are now proved to be identical 01 JetAudio.mp3 & 01 VBR128-320kb.mp3 do NOT have same hashing value .... So as if encoding directly from the CD or from the lossless extraction was not the same. Actually the 01 WMP11.mp3 is 4 274 999 bytes, whilst the 01 VBR128-320kb.mp3 is 4 274 895 bytes Why??

Hello, I wish to convert wav files to MP3 in the most "lossless" encoding, but I wonder about setting the mimimal bit rate Therefore I put in the encoder options Encoding mode : joint CBR: checked VBR Quality : 0(highest) max. bit rate : 320 Kbps Now, the mimimal bit rate can be set as low as 32Kbps or as high as on wish. After some test with the same input wav file, I wonder about the true loss of setting the min bit rate to a low number such as 32 Kbps or a high one as 224Kpbs in the terms of true hearable quality difference. Indeed, if there is a moment of near silence, when setting a min to 32Kbps or 224Kbps, files size will differ significantly, but not the experience. So my question is what does Switch Sound File Converter really do ? Is it really important to set a high min bit rate ??? Could a developper explain what Thanks. Phil