diff --git a/libmpdemux/aviwrite.c b/libmpdemux/aviwrite.c
index df8dda180d..4dcc821358 100644
--- a/libmpdemux/aviwrite.c
+++ b/libmpdemux/aviwrite.c
@@ -115,6 +115,9 @@ static void write_avi_list(FILE *f,unsigned int id,int len){
   fwrite(&id,4,1,f);
 }
 
+// muxer->streams[i]->wf->cbSize
+#define WFSIZE(wf) (sizeof(WAVEFORMATEX)+(((wf)->cbSize)?((wf)->cbSize-2):0))
+
 void aviwrite_write_header(aviwrite_t *muxer,FILE *f){
   unsigned int riff[3];
   int i;
@@ -128,11 +131,11 @@ void aviwrite_write_header(aviwrite_t *muxer,FILE *f){
   // update AVI header:
   if(muxer->def_v){
       muxer->avih.dwMicroSecPerFrame=1000000.0*muxer->def_v->h.dwScale/muxer->def_v->h.dwRate;
-      muxer->avih.dwMaxBytesPerSec=1000000; // dummy!!!!! FIXME
-      muxer->avih.dwPaddingGranularity=2; // ???
+//      muxer->avih.dwMaxBytesPerSec=1000000; // dummy!!!!! FIXME
+//      muxer->avih.dwPaddingGranularity=2; // ???
       muxer->avih.dwFlags|=AVIF_ISINTERLEAVED|AVIF_TRUSTCKTYPE;
       muxer->avih.dwTotalFrames=muxer->def_v->h.dwLength;
-      muxer->avih.dwSuggestedBufferSize=muxer->def_v->h.dwSuggestedBufferSize;
+//      muxer->avih.dwSuggestedBufferSize=muxer->def_v->h.dwSuggestedBufferSize;
       muxer->avih.dwWidth=muxer->def_v->bih->biWidth;
       muxer->avih.dwHeight=muxer->def_v->bih->biHeight;
   }
@@ -148,7 +151,7 @@ void aviwrite_write_header(aviwrite_t *muxer,FILE *f){
           hdrsize+=muxer->streams[i]->bih->biSize+8; // strf
 	  break;
       case AVIWRITE_TYPE_AUDIO:
-          hdrsize+=sizeof(WAVEFORMATEX)+muxer->streams[i]->wf->cbSize+8; // strf
+          hdrsize+=WFSIZE(muxer->streams[i]->wf)+8; // strf
 	  break;
       }
   }
@@ -163,7 +166,7 @@ void aviwrite_write_header(aviwrite_t *muxer,FILE *f){
           hdrsize+=muxer->streams[i]->bih->biSize+8; // strf
 	  break;
       case AVIWRITE_TYPE_AUDIO:
-          hdrsize+=sizeof(WAVEFORMATEX)+muxer->streams[i]->wf->cbSize+8; // strf
+          hdrsize+=WFSIZE(muxer->streams[i]->wf)+8; // strf
 	  break;
       }
       write_avi_list(f,listtypeSTREAMHEADER,hdrsize);
@@ -173,7 +176,7 @@ void aviwrite_write_header(aviwrite_t *muxer,FILE *f){
           write_avi_chunk(f,ckidSTREAMFORMAT,muxer->streams[i]->bih->biSize,muxer->streams[i]->bih);
 	  break;
       case AVIWRITE_TYPE_AUDIO:
-          write_avi_chunk(f,ckidSTREAMFORMAT,sizeof(WAVEFORMATEX)+muxer->streams[i]->wf->cbSize,muxer->streams[i]->wf);
+          write_avi_chunk(f,ckidSTREAMFORMAT,WFSIZE(muxer->streams[i]->wf),muxer->streams[i]->wf);
 	  break;
       }
   }
diff --git a/mencoder.c b/mencoder.c
index 4f7a03cbbd..083a80ae69 100644
--- a/mencoder.c
+++ b/mencoder.c
@@ -415,7 +415,7 @@ case VCODEC_DIVX4:
     mux_v->bih->biSize=sizeof(BITMAPINFOHEADER);
     mux_v->bih->biWidth=sh_video->disp_w;
     mux_v->bih->biHeight=sh_video->disp_h;
-    mux_v->bih->biPlanes=0;
+    mux_v->bih->biPlanes=1;
     mux_v->bih->biBitCount=24;
     mux_v->bih->biCompression=mmioFOURCC('d','i','v','x');
     mux_v->bih->biSizeImage=mux_v->bih->biWidth*mux_v->bih->biHeight*(mux_v->bih->biBitCount/8);
@@ -460,14 +460,21 @@ case ACODEC_VBRMP3:
     mux_a->h.dwSampleSize=0; // VBR
     mux_a->h.dwScale=4608/4;
     mux_a->h.dwRate=sh_audio->samplerate;
-    mux_a->wf=malloc(sizeof(WAVEFORMATEX));
+    if(sizeof(MPEGLAYER3WAVEFORMAT)!=30) mp_msg(MSGT_MENCODER,MSGL_WARN,"sizeof(MPEGLAYER3WAVEFORMAT)==%d!=30, maybe broken C compiler?\n",sizeof(MPEGLAYER3WAVEFORMAT));
+    mux_a->wf=malloc(sizeof(MPEGLAYER3WAVEFORMAT)); // should be 30
     mux_a->wf->wFormatTag=0x55; // MP3
     mux_a->wf->nChannels=sh_audio->channels;
     mux_a->wf->nSamplesPerSec=sh_audio->samplerate;
-    mux_a->wf->nAvgBytesPerSec=0;
+    mux_a->wf->nAvgBytesPerSec=192000/8; // FIXME!
     mux_a->wf->nBlockAlign=1;
-    mux_a->wf->wBitsPerSample=16;
-    mux_a->wf->cbSize=0; // FIXME for l3codeca.acm
+    mux_a->wf->wBitsPerSample=0; //16;
+    // from NaNdub:  (requires for l3codeca.acm)
+    mux_a->wf->cbSize=12;
+    ((MPEGLAYER3WAVEFORMAT*)(mux_a->wf))->wID=1;
+    ((MPEGLAYER3WAVEFORMAT*)(mux_a->wf))->fdwFlags=2;
+    ((MPEGLAYER3WAVEFORMAT*)(mux_a->wf))->nBlockSize=1024; // ???
+    ((MPEGLAYER3WAVEFORMAT*)(mux_a->wf))->nFramesPerBlock=1;
+    ((MPEGLAYER3WAVEFORMAT*)(mux_a->wf))->nCodecDelay=0;
     break;
 }
 }