Artifacts at the beginning of the file |
  |
Artifacts at the beginning of the file |
 Feb 9 2012, 14:53
Post
#1
|
|
 Group: Developer Posts: 304 Joined: 29-April 11 From: Austria Member No.: 90198  |
Hello,
encoding the file linked below results in an artifact in the beginning of the mp3 (sounds like a click) using $ lame --preset insane --noreplaygain B.wav LAME 3.99.4 64bits (http://lame.sf.net) ... B.wav A.wav (mp3 converted to wav, edit: using lame --decode, which seems to be the cause of the problem) Here's an overlay of the mp3 (red) and original wav (blue):  Any ideas why this is happening? This post has been edited by xnor: Feb 9 2012, 18:22 |
 |
 
|
|
Feb 9 2012, 15:51
Post
#2
|
|
|
Group: Members Posts: 951 Joined: 6-September 04 Member No.: 16817 |
Almost sounds like it's encoding the header as audio?
|
|
|
|
|
Feb 9 2012, 16:09
Post
#3
|
|
|
Group: Developer Posts: 304 Joined: 29-April 11 From: Austria Member No.: 90198 |
The artifact is not present in the mp3 itself. I traced the problem down to lame --decode. Decoding (mp3 -> wav) the file with fb2k doesn't result in that artifact in the beginning.
This post has been edited by xnor: Feb 9 2012, 16:23 |
|
|
|
|
Feb 9 2012, 18:11
Post
#4
|
|
 Group: Members Posts: 21 Joined: 30-November 04 From: SoCal-SGV Member No.: 18423 |
You are a true audiophile, xnor! Hardcore, I have to be more like you. I'll check out the LAME bug tracker and build 3.99 through 3.99.3 later (I really need some sleep first), run a series of encodes/decodes, see if this issue is a regression, or a new bug.
-------------------- IBM T42 2378-FZU
Audigy 2 ZS Notebook Shure E4 Earphones foobar2000 0.9 b8 |
|
|
|
|
Feb 9 2012, 18:15
Post
#5
|
|
 xcLame and OggDropXPd Developer Group: Developer Posts: 3708 Joined: 30-September 01 From: Bracknell, UK Member No.: 111 |
It would seem this is a regression as I just decoded the mp3 with 3.98.4 and all was well. I'll check back and see where this may have occurred.
-------------------- John
---------------------------------------------------------------- My compiles and utilities are at http://www.rarewares.org/ |
|
|
|
|
Feb 9 2012, 18:20
Post
#6
|
|
|
Group: Developer Posts: 304 Joined: 29-April 11 From: Austria Member No.: 90198 |
@adamlau: Nope, being a software developer myself I just like seeing bugs fixed.
 @john33: Thanks for taking a look at this. This post has been edited by xnor: Feb 9 2012, 18:20 |
|
|
|
|
Feb 9 2012, 19:26
Post
#7
|
|
|
xcLame and OggDropXPd Developer Group: Developer Posts: 3708 Joined: 30-September 01 From: Bracknell, UK Member No.: 111 |
Hopefully, Robert will pick up on this. There was quite a lot going on in the switch from mpglib to hiplib at this time making it a little difficult to track through but Robert, perhaps, could put his finger on this quite quickly.
EDIT: I have emailed Robert to draw his attention to this. 
This post has been edited by john33: Feb 9 2012, 20:00 -------------------- John
---------------------------------------------------------------- My compiles and utilities are at http://www.rarewares.org/ |
|
|
|
|
Feb 11 2012, 12:08
Post
#8
|
|
 LAME developer Group: Developer Posts: 761 Joined: 22-September 01 Member No.: 5 |
Thanks xnor, for finding this issue. It crept in early in 3.99 development. This will be fixed in official 3.99.5 soon.
|
|
|
|
|
Feb 28 2012, 12:09
Post
#9
|
|
|
Group: Developer Posts: 304 Joined: 29-April 11 From: Austria Member No.: 90198 |
Thanks, that's good news.
|
|
|
|
|
|
Lo-Fi Version | Time is now: 24th May 2013 - 09:15 |
