Audiobook Encoding From CD
Reply #4 – 2007-03-15 17:24:51
After a little more testing, I managed to narrow down where I can tell the difference. I started with this as the base: -V6 --vbr-new -mm -q 0 --noreplaygain As mentioned before, I can't tell the difference between this and the CD. Then I adjusted only the V setting to 7, 8, and 9. Making sure with ABX testing, 7 was indistinguishable for me, and 8 was distinguishable 100%, but it was a pretty small difference. 9 was an obviously different sound. According to this chart , which is for LAME 3.95.1 but I assume still holds for 3.97, these are the auto adjustments:Switch target lowpass resample -V 6 --vbr-new 115 16000 -V 7 --vbr-new 100 14900 32000 -V 8 --vbr-new 85 12500 32000 -V 9 --vbr-new 65 10000 24000 So I can't tell the difference if the audio is --resampled to 32kHz, but as I mentioned in my first post I can tell easily at 22.05kHz. I also can't tell a --lowpass 14900, but I can at 12500. To test a little further, I compared standard -V8 to -V8--lowpass 10 and the difference was very pronounced to me. So it appears that my threshold where I can't tell a difference on this sample is about --resample 32 --lowpass 15. I guess that leaves three questions: 1. Was there a problem with my methodologies or conclusions? 2. Were there some other settings that I should have tried? 3. Why does the HA Wiki suggest -abr for speech if not a single person in the forums suggests it?