Hi,

did you try to output dts/ac3 encoded audio through HDMI instead of raw PCM?

mplayer -ac hwac3,hwdts -ao alsa:device=hw=0.3 master_and_commander.iso

-- 
strawks

On 18/11/2009 13:24, Stephen Rowles wrote:
> Hi all,
> 
> Not really the right place, but before I subscribe to alsa / mplayer to 
> try and work out what was wrong I thought I would start here :)
> 
> I've got an ASRock ION-330, and I'm trying to get surround sound sorted 
> out. It is an ION system (Nvidia 9400).
> 
> I use the following mplayer command:
> 
> mplayer master_and_commander.iso -ao alsa:device=hw=0.1 -ac help -channels 6
> 
> Which outputs the digital audio over the optical spdif output, which 
> when plugged in to my surround amp quite happily switched into 5.1 mode 
> and plays the audio correctly.
> 
> However if I try to output via HDMI (hw=0.3), and then run the optical 
> out from the TV into the surround sound amp, the amp doesn't switch into 
> digital mode and I get lots of digital garbage noise that the amp tries 
> to output as stereo. I get the same noise from the TV but I didn't 
> expect the TV to actually decode and output the surround sound.
>
> Is this a setting problem in alsa / driver / mplayer? Or is this simply 
> because the TV is doing the wrong thing? I'm inclined to believe the 
> that TV is failing to decode the digital signal and effectively sending 
> out stereo noise bitstream rather than just passing through the digital 
> signal. (It's a Samsung 32inch LCD - LE32B450).
> 
> If people also think this is the case then I'll contact Samsung, there 
> is a newer firmware version which might solve the problem, but they 
> don't give out patch notes and I don't really want to upgrade the 
> firmware unless it will really help!
> 
> Any thoughts / opinions welcome.
> 
> Cheers,
> 
> Steve.
> 
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