<code>-af "pan=mono|c0=c0"</code> extracts a single channel from the file. Use <code>c0=c0</code> for left channel, <code>c0=c1</code> for right channel. | <code>-af "pan=mono|c0=c0"</code> extracts a single channel from the file. Use <code>c0=c0</code> for left channel, <code>c0=c1</code> for right channel. |