Multi channel Flac Upmix Issue (1 Viewer)

[sPiel]

MediaPortal Version: 1.2.0
MediaPortal Skin: Avalon
Windows Version: Windows 7 Pro
CPU Type: AMD64 3200
HDD: 3.5” HDD 320GB
Memory: 2GB DDR2 800 MHz memory
Motherboard:
Video Card: ATI Radeon HD 3600
Video Card Driver:
Sound Card: onboard
Sound Card AC3: Analogue (discrete outputs)
Sound Card Driver:
1. TV Card:
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection: HDMI

After a lot of messing about I've discovered that my 5.1 surround flac version of Wish You Were Here will only play properly if 'Upmix to 5.1/7.1' is unchecked in the configuration. Which of course means that all of my standard mp3s only come out of the front 2 speakers.

With upmix on it sounds like all the channels are upmixed and when the system volume is changed it makes popping noises (very strange), but all other files play perfectly. With upmix off the 5.1 ch flac sounds absolutely awesome and does not make any popping noises when the system volume is adjust3ed, but all the other files sound terrible (as they only come out the front speakers).

I'm using the Bass engine, should it be ignoring upmix on multi channel audio?

<edit>P.S. I tried using direct show for music and let ffdshow handle it, things worked correctly but the performance was terrible so this is not an option for me</edit>

 

[sPiel]

Anyone else experienced this?

 

[hwahrmann]

The current implementation of the BASS engine has several problems using Multi channel files.
It most probably won't work at all.

I'm currently rewriting it for the 1.3.0 release

 

[sPiel]

Thanks. It works fine as long as you don't make it upmix (perhaps it upmixes the front l/r channels to all channels). Anyway, keep up the great work.