Help: Dolby Prologic II instead of Prologic

[z_sfeng]

I have a laptop, which has only stereo output, not 5.1, no SPDIF. Luckly, I have an audio receiver which are capable of Dolby surround, prologic and prologic II.
I can get surround sound by downmixing 5.1 channel to 2-channel stereo in laptop, and playback correctly using the receiver.
In windows, I set AC3Filter output to "Dolby Prologic II", the receiver decodes it correctly.
In linux, I heard liba52 will make the downmixing by default. But is seems it downmixes to Prologic, not Prologic II, i.e. the two rear surround channel are mixed together, left-rear and right-rear are not seperated.
How can I tell mplayer/xine which output format to use?
I downloaded a test file from here:

[mamac]

Hi,

The only thing I see for mplayer is "-channels" switch, see man if that can help you.
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[z_sfeng]

No. I tried it. -channels should always be set to 2 (default), and mplayer will down mix to 2. otherwise, other channels are just missing.
Using "pan" mixing might be something, but i don't think it will be the solution...