Welcome Guest ( Log In | Register )

Negative gains may result in slightly lower bitrates, 711 MiB gained over a total of 27 GiB
post Nov 28 2012, 21:36
Post #1

Group: Developer
Posts: 1455
Joined: 4-May 04
From: France
Member No.: 13875

I started experimenting a bit after Greynol said that he applies album gain prior to MP3 encoding. I did the same while transcoding my entire library to Vorbis (AoTuV) -q 5: the resulting files take 711 MiB less than their counterpart (gain unchanged), over a total of 27.2 GiB. That's a 2.56% gain; average bitrate went down from 161 kbps to 157 kbps.

Obviously, I got those results because most of my music gets negative Replaygain values. As far as I'm concerned, it's interesting because I'm pretty short on space on my Clip's 32 GB microsdhc card.

See my profile for measurements, tools and recommendations.
Go to the top of the page
+Quote Post
Start new topic
post Nov 28 2012, 21:56
Post #2

Group: Super Moderator
Posts: 11377
Joined: 1-April 04
From: Northern California
Member No.: 13167

No problem. Another benefit of scaling downwards prior to encoding is that clipping during lossy decoding can be mitigated, for those who are worried about it.

Your eyes cannot hear.
Go to the top of the page
+Quote Post
post Nov 28 2012, 22:05
Post #3

Group: Members
Posts: 211
Joined: 22-July 12
Member No.: 101637

I suppose that this makes sense, in that some of the quieter sections of the track will be attenuated down to (near) silence, so the lossy encoder only needs to approximate a narrower section of the audio spectrum.

EDIT: The topics that greynol links to seems to explain this quite well. Looks like I have some reading to do smile.gif

This post has been edited by BFG: Nov 28 2012, 22:07
Go to the top of the page
+Quote Post

Posts in this topic

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:


RSS Lo-Fi Version Time is now: 25th November 2015 - 09:59