VLC Mosaic no audio?

[jianxia]

I create a mosaic, the video is ok but I can hear nothing.
If I play every single input file, everything is ok. can somebody give me any idea?
thanks a lot!

my vlm config file is here.

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# VLC media player VLM command batch # http://www.videolan.org/vlc/ new channel2 broadcast enabled loop setup channel2 input "file:///E:/vlm/a.mkv" setup channel2 output #duplicate{dst=mosaic-bridge{id=a,width=400,height=600},select=video,dst=bridge-out{id=1},select=audio} new channel3 broadcast enabled loop setup channel3 input "file:///E:/vlm/c.mkv" setup channel3 output #duplicate{dst=mosaic-bridge{id=b,width=400,height=600},select=video,dst=bridge-out{id=2},select=audio} new bg broadcast enabled setup bg input "file:///E:/vlm/x.png" setup bg option image-duration=-1 setup bg output #transcode{sfilter=mosaic,vcodec=mp4v,vb=1000,acodec=mp3,ab=128,channels=1,scale=1}:bridge-in{delay=400,id-offset=100}:display control channel2 play control channel3 play control bg play

and the command line is:

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E:\vlm>vlc --mosaic-height=500 --mosaic-width=800 --mosaic-xoffset=0 --mosaic-yoffset=0 --mosaic-position=0 --mosaic-order="a,b,c,d" --mosaic-rows=2 --mosaic-cols=2 --vlm-conf a.vlm