Skip to main content
Topic: Killer sample for FDK AAC (easily ABX-able in both VBR and CBR at max quality) (Read 8457 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

Killer sample for FDK AAC (easily ABX-able in both VBR and CBR at max quality)

Testing with the fdkaac binary coming with the foobar2000 encoder pack, latest available version.

The sample is in 44100hz / 16 bits per sample, so it's not about dithering and stuff like that.

The problem is that the "pop" at the very beginning sounds very different after encode with mode VBR 4 or 5. Even pushing the bitrate really to the limit (512 kbps CBR) doesn't help here at all.

The amount of silence before the "pop" doesn't seem to matter, I just added 1 second so that it's easier to test (in case someone's device doesn't start producing sound immediately)

Log for VBR 5:
Code: [Select]
foo_abx 2.0.6c report
foobar2000 v1.4.6
2019-08-18 22:51:08

File A: 20hz with pause and fadeout 16bit.flac
SHA1: dcbf75fd6dad9a7489438d45ec4d81a39993a9f8
File B: 20hz with pause and fadeout 16bit fdkaac vbr 5.m4a
SHA1: 0052546abb3fe3913e6d92931140e4285aaee0b8

Output:
WASAPI (shared) : Out: default
Crossfading: NO

22:51:08 : Test started.
22:51:56 : 01/01
22:52:07 : 02/02
22:52:27 : 03/03
22:52:38 : 04/04
22:52:44 : 05/05
22:52:50 : 06/06
22:52:56 : 07/07
22:53:02 : 08/08
22:53:08 : 09/09
22:53:13 : 10/10
22:53:18 : 11/11
22:53:23 : 12/12
22:53:29 : 13/13
22:53:34 : 14/14
22:53:40 : 15/15
22:53:50 : 16/16
22:53:50 : Test finished.

 ----------
Total: 16/16
p-value: 0 (0%)

 -- signature --
c70e5a77f3c18b0dea6b9e7d4e60360888042c71
Can also do log for CBR 512 if needed but you can trust me, it's just the same problem, not affected by bitrate.

Version: (written in the file tags but just in case)
Code: [Select]
$ wine ~/Documents/foobar2000/encoders/fdkaac/fdkaac.exe --help
fdkaac 0.6.3
Usage: fdkaac [options] input_file
...

Re: Killer sample for FDK AAC (easily ABX-able in both VBR and CBR at max quality)

Reply #1
Quote
VBR 4 or 5
P.S. I'm not saying than 1..3 are unaffected, I just didn't bother to test them. They probably are just the same.

Re: Killer sample for FDK AAC (easily ABX-able in both VBR and CBR at max quality)

Reply #2
Testing with the fdkaac binary coming with the foobar2000 encoder pack
But there is no FDK encoder in foobar2000 encoder pack.

Re: Killer sample for FDK AAC (easily ABX-able in both VBR and CBR at max quality)

Reply #3
Wait a sec...
I'll delete it and reinstall and check. I thought it was from there.

Re: Killer sample for FDK AAC (easily ABX-able in both VBR and CBR at max quality)

Reply #4
Yes, you're right. The dumbass in me thought that it's from the fb2k encoder pack, but actually it's from somewhere else, I have no idea because I forgot. Either I compiled it myself, or ....
So that kind of invalidates the claim, unless someone else wishes to try to encode this sample, because I'd rather give up than go through necessary steps to compile it (IIRC, last time I checked, it wasn't easy)
Or maybe I'll try to build it from source later. And post details on how it was made. (just in case it's a problem with the specific build)

 
SimplePortal 1.0.0 RC1 © 2008-2019