Welcome Guest ( Log In | Register )

2 Pages V  < 1 2  
Reply to this topicStart new topic
Some unusual results in lame 3.99.5
post May 1 2013, 22:17
Post #26

Group: Members
Posts: 2424
Joined: 9-October 05
From: Dormagen, Germany
Member No.: 25015

QUOTE (ThomasG3rd @ May 1 2013, 17:43) *
... Im not sure if the following statement is true but if the bitrate is larger, wouldnt the file size also be larger?? ...

With several posts I explained to you that the audio data are packaged into frames. Frames are the containers for the audio data. Frames come with fixed sizes corresonding to bitrates of 320, 256, 224, ... kbps. When encoding a track N frames are created. Whenever a bitrate is displayed to you (correctly - not always the case), it's the average frame bitrate of these N frames.
Average frame bitrate corresponds with file size.
Average frame bitrate however is not exactly what you're interested in. You're interested in average audio data bitrate. But you'll never get an information about audio data bitrate. Audio data bitrate is hidden to you.

Things aren't real bad though. The way most users use Lame, audio data are packaged efficiently into frames. Thus audio data bitrate is (nearly) identical with frame bitrate.
There are few exceptions:
a) when doing the nonsense of turning bitreservoir off (I've demonstrated to you that this blows up frame bitrate, that is file size, because of totally unused bits)
b) by requiring Lame to use a very high minimum (frame) bitrate (same mechanism as when turning bitreservoir off)
c) maybe by using some other option the user doesn't understand (though none such comes to my mind at the moment).
d) by using CBR 320. Audio data bitrate of Lame CBR320 files vary from track to track. On average it's more like 305 kbps, not 320 kbps.

This post has been edited by halb27: May 1 2013, 22:19

lame3100m -V1 --insane-factor 0.75
Go to the top of the page
+Quote Post
post May 1 2013, 22:22
Post #27

Group: Super Moderator
Posts: 10000
Joined: 1-April 04
From: San Francisco
Member No.: 13167

QUOTE (ThomasG3rd @ May 1 2013, 14:14) *
I have been doing some sound sighted testing, not ABX testing

Fixed this for you. The point of ABX testing is to ensure you are in fact only testing what you hear.

Go to the top of the page
+Quote Post

2 Pages V  < 1 2
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: 22nd July 2014 - 20:30