My question is very simple: is it better to convert to 48 kHz before encoding ? (even with codecs what use 192 samples for short blocks).
- lame (especially alt-presets) is tuned for 44.1kHz and performs audibly worse on some samples at 48kHz (but not better anywhere IIRC).
Quote- lame (especially alt-presets) is tuned for 44.1kHz and performs audibly worse on some samples at 48kHz (but not better anywhere IIRC).Can you find a link ? I know that resampling to 48 kHz is not recommended, but I don't remember about tests showing problems.
<snip> (DVD 48kHz PCM track -> mp3). <snip> I found two samples in the track where I could successfully ABX 48kHz lame 3.90.2 aps vs. Original but not 44.1kHz lame 3.90.2 aps (downsampled with SSRC before encoding, 24bit output file). Unfortunately I don't have the original anymore, so I can't provide samples. The difference was some slight ringing/chirping added. In spectral view some "dropouts" (black "holes") at ~ 15kHz were visible at these positions (I did this after ABXing ).