FFAStrans wiki

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<p>This filter enables you to map audio channels. You can also use it to reduce the number of channels being processed.</p>
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<p><b><u>Channel layout</u></b></p>
<p style=margin-top:-15>Here you select the total number of audio channels, ranging from one (mono) to 24 (22. 2). All channels will be muxed to one audio stream.</p>
<p>The mapping works by defining what channel goes where.</p>
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<p><b><i>Example: </i></b><i>Mapping 2 channels to 4, with the first on 1 and 2, and the second on 3 and 4:</i></p>
<p><i>1 -&gt; 1</i></p>
<p><i>1 -&gt; 2</i></p>
<p><i>2 -&gt; 3</i></p>
<p><i>2- &gt; 4</i></p>
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<p>If you select the any of the &quot;2 (x -> stereo)&quot; presets FFAStrans will mix down original 3, 4, 5 or 6 channels to stereo. You can still map channels prior to mixdown.</p>
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<p><b><i>Note: </i><i>Starting form 1.1.0 you also have the option to use the more advanced channel mapper available inn all encoders, except "Custom FFmpeg".</i></b></p>
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