Hi,

Simon Baxter wrote:

My media box has 6 channel output LF,RF,LR,RR,C,SW which I'm using with ALSA. Mplayer plays through all channels fine (settings in ~/.mplayer/config), but VDR sourced audio only plays in stereo from the LR,RF output.

Given that there is no way to play 'real' surround sound from pvrinput sourced audio, what is the easiest way to 'copy' the audio to the other channels, so I at least get sound out all the speakers?

Hmm, perhaps this is a setting in xine...?

Just add

--post-plugin upmix

to the command line, e. g.

... --post vdr_audio --post upmix_mono --post upmix ...

This is what the audio plugins do:

- vdr_audio is used to select the left or the right channel of a stereo audio stream by copying the audio data from the left channel to the right or vice versa. In that way the stream has still two -- now identical -- channels. This one may be omitted if you do not need this functionality.

- upmix_mono mixes a mono stream (single channel) into a "stereo" stream with two identical channels. This one may be omitted if you do not need this functionality.

- upmix finally mixes a stereo stream into a 5.1 stream with 6 different channels.

All plugins process the audio stream under certain conditions so there is no waste of CPU power and hence no need to remove or disable them in certain situations, e. g. when replaying 5.1 content.

Keep in mind to select 5.1 as your speaker arrangement in xine's audio setup page.

Bye.