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Problem samples for MP3
shadowking
post Nov 2 2009, 13:49
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Ringing on all acoustic tracks sometimes up to V0 (angels is the worse). Preecho on jane doe upto V1. Distorted vocal [rita] @ 2 secs and big one @ 6 secs
Attached File(s)
Attached File  05___Angels_Fall_First_ringing.flac ( 2.86MB ) Number of downloads: 525
Attached File  08._Sarah_McLachlan___Ice_ringing.flac ( 1.18MB ) Number of downloads: 233
Attached File  10___I_Remember_You_ringing.flac ( 874.03K ) Number of downloads: 187
Attached File  13___Jane_Doe_vbr_problem.flac ( 1.85MB ) Number of downloads: 250
Attached File  01___rita___distroted_vocal.flac ( 1.2MB ) Number of downloads: 274
 


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halb27
post Nov 2 2009, 19:49
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Thanks for your samples, shadowking.

I'm most afraid of distortions in vocals, so I tried rita.
At -V5 I could easily ABX the problem.
As I usually encode using -V0 or -V1.5 (together with --lowpass 16.7) I encoded with these settings.
Results were fine to me.
Did you encounter the rita problems with higher settings?

What were the problems for -V0? (I tried angels using -V0 - can you give a hint for the critical spot
in case there were problems with angel at -V0).

This post has been edited by halb27: Nov 2 2009, 19:50


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shadowking
post Nov 3 2009, 00:58
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Thanks for testing.

With rita, i tested V1 -Y last week . I initially got confused but after longer pauses i could abx.
With angels the 1st "twang" is the most distorted. Its a 'ghosting' or tremolo of the note . With the volume slightly raised i hear it in normal listening @ V0.

This post has been edited by shadowking: Nov 3 2009, 00:58


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halb27
post Nov 3 2009, 20:01
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I tried again using -V1.5 --lowpass 16.7, but didn't succeed.
Probably I didn't try hard enough or my hearing isn't good enough, and with angel I unfortunately didn't hear something that sounded like a 'twang' to me.

Anyway I also experienced issues with mp3 other than the well-known pre-echo ones even at a HQ setting like -V0 or similar.
Luckily so far these issues have always been subtle to me when using HQ settings, and I'm glad this doesn't change with your samples.


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halb27
post Nov 5 2009, 08:20
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With -V0 being pretty strong with 3.98 I have always wondered whether there is quality improvement when going up to --abr 285 -h (or similar) or -b 320 for those problems where -V0 isn't perfect.

If you have the time, shadowking, would you mind trying extremely high quality settings like those I mentioned on your sample?


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shadowking
post Jul 9 2013, 11:57
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I noticed some nice progress with lame 3100 alpha2 on 01-Rita...

The vocal dropout is much more subtle . I would say V4 is not annoying and V3 needed concentration to abx and would go unnoticed in normal listening.

Just to be sure I went back to 3.99 / 3.98 and V4 was much more obvious.

This post has been edited by shadowking: Jul 9 2013, 12:00


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halb27
post Jul 10 2013, 19:24
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Thanks for the info.
There's been experience before that 3.100a2 yields certain improvement over 3.99, and any further experience (be it good or bad) is very welcome.


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