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diff --git a/lib/liblame/doc/html/modes.html b/lib/liblame/doc/html/modes.html new file mode 100644 index 0000000000..9c7707a073 --- /dev/null +++ b/lib/liblame/doc/html/modes.html @@ -0,0 +1,48 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML> +<HEAD> +<TITLE>Encoding modes</TITLE> +<META NAME="description" CONTENT="Command line switch reference"> +<META NAME="keywords" CONTENT="lame"> +<META NAME="resource-type" CONTENT="document"> +<META NAME="distribution" CONTENT="global"> +<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso_8859_1"> +<LINK REL="STYLESHEET" HREF="lame.css"> +</HEAD> +<BODY TEXT=#000000 + BGCOLOR=#F9FBFB LINK=#006666 VLINK=#4C4C4C + ALINK=#995500> +<H1>CBR/ABR/VBR: the 3 encoding modes</H1> +<p> </p> +<p>LAME is able to encode your music using one of its 3 encoding modes: constant + bitrate (CBR), average bitrate (ABR) and variable bitrate (VBR).<br> + <br> + <br> +</p> +<h2>Constant Bitrate (CBR)</h2> +<p>This is the default encoding mode, and also the most basic. In this mode, the + bitrate will be the same for the whole file. It means that each part of your + mp3 file will be using the same number of bits. The musical passage beeing a + difficult one to encode or an easy one, the encoder will use the same bitrate, + so the quality of your mp3 is variable. Complex parts will be of a lower quality + than the easiest ones. The main advantage is that the final files size won't + change and can be accurately predicted.<br> + <br> +</p> +<h2>Average Bitrate (ABR)</h2> +<p>In this mode, you choose a target bitrate and the encoder will try to constantly + maintain an average bitrate while using higher bitrates for the parts of your + music that need more bits. The result will be of higher quality than CBR encoding + while the average file size will remain predictible, so this mode is highly + recommended over CBR.<br> + <br> +</p> +<h2>Variable bitrate (VBR)</h2> +<p>In this mode, you choose the desired quality on a scale going from 9 (lowest + quality/highest distortion) to 0 (highest quality/lowest distortion). Then encoder + tries to maintain the given quality in the whole file by choosing the optimal + number of bits to spend for each part of your music. The main advantage is that + you are able to specify the quality level that you want to reach, but the inconvenient + is that the final file size is totally unpredictible.</p> +</BODY> +</HTML> |