I am reducing the bit depth of some FLACs from 24 to 16bit (maybe keeping 24, I am not sure) and the sample rate from 192k to 48k (per research it’s suggested to reduced in common divisors, so div by 4 is 48k).
The situation is that I am not sure what kind of dither to apply as per research it shows that the less intrusive distortion should be the triangular with shape option, however I have no idea about what shape form, extended shape form, intensity or if I should use adaptive mode.
I hope any expert in the community can give me some suggestions or explain a little more about these options to keep these FLACs as good as possible. Thanks!
Shaped dither is meant to move more of the energy of the noise into the upper frequency bands, and thus be less potentially audible to most folks. Triangular dither has a noise distribution (so how the random values of the dither are spread around the true sample value) that is more often close to zero than a uniform spread, though I don’t know why it would be superior to Gaussian.
Second the vote to just keep it at 24 bit unless space is a real concern. If it is, shaped 16-bit should do fine.