Versions 1.5.1 and 1.3.3 haven't quality improvements. Only fixes for bugs and some regressions.Version 1.1.34 has only some retuning and no quality improvements in LC-AAC encoder. And at least one regression was introduced in this version.Some quality improvements were made in 126.96.36.199. It's more than 3 years ago.
I haven't done a proper ABX test, but it's immediately clear (to me at least) that the new 188.8.131.52 encoder is MUCH better on this sample.
1. Do you make conclusion looking at the result of one sample? Encoder can do better on one sample but worse on others. That's actually happens with 1.5.4. Overall there is no quality improvement. Read the entire topic.2. Quote from: matt_t on 23 December, 2009, 03:28:07 PMI haven't done a proper ABX test, but it's immediately clear (to me at least) that the new 184.108.40.206 encoder is MUCH better on this sample.So you have made a conclusion basing on a single result without blind test.
On some samples it got better, on some samples it got worse. Due to the big investigation that was invested in it, I believe that in average (among samples and listeners) it got just a bit better, but at the end it depends on what music you like to listen and if the changes are good for your ears or not.
There is no point doing a blind test I know I will fail completely having got 16/16 with the previous version. I know what artifact I heard with the old version, and it has gone with the new one.