diff -Nraub mplayer.ori/libmpcodecs/ae_pcm.c mplayer/libmpcodecs/ae_pcm.c
--- mplayer.ori/libmpcodecs/ae_pcm.c	2006-06-05 15:43:08.000000000 -0400
+++ mplayer/libmpcodecs/ae_pcm.c	2006-10-10 23:06:51.000000000 -0400
@@ -37,7 +37,27 @@
 static int encode_pcm(audio_encoder_t *encoder, uint8_t *dest, void *src, int nsamples, int max_size)
 {
 	max_size = min(nsamples, max_size);
+    if (encoder->params.channels == 6 || encoder->params.channels == 5) {
+        //Codec wants: L R C  LFE SL SR        L R C  SL SR
+        //We have:     L R SL SR  C  LFE       L R SL SR  C
+        max_size -= max_size % (2*encoder->params.channels);
+        int i;
+        for (i = 0; i < max_size; i += 2*encoder->params.channels) {
+            if (encoder->params.channels == 6) {
+                ((uint32_t*)(dest+i))[0] = ((uint32_t*)(src+i))[0]; //L R   -> 0,1
+                ((uint32_t*)(dest+i))[1] = ((uint32_t*)(src+i))[2]; //C LFE -> 2,3
+                ((uint32_t*)(dest+i))[2] = ((uint32_t*)(src+i))[1]; //SL SR -> 4,5
+            } else {
+                ((uint16_t*)(dest+i))[0] = ((uint16_t*)(src+i))[0]; //L     -> 0
+                ((uint16_t*)(dest+i))[1] = ((uint16_t*)(src+i))[1]; //R     -> 1
+                ((uint16_t*)(dest+i))[2] = ((uint16_t*)(src+i))[4]; //C     -> 2
+                ((uint16_t*)(dest+i))[3] = ((uint16_t*)(src+i))[2]; //SL    -> 3
+                ((uint16_t*)(dest+i))[4] = ((uint16_t*)(src+i))[3]; //SR    -> 4
+            }
+        }
+    } else {
 	memcpy(dest, src, max_size);
+    }
 	return max_size;
 }