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ac3 passthrough does not work with Sound Blaster MP3+ - Printable Version

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ac3 passthrough does not work with Sound Blaster MP3+ - gjstroom - 08-22-2012

I have the latest openelec 1.95.6 (2.0 Beta 6) installed.
My soundcard is a Sound Blaster MP3+ usb device, the internal sound card is disabled. My videocard is a Radeon 5450.

root ~ # aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: MP3 [Sound Blaster MP3+], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0

These are my settings:
<audiooutput>
<ac3passthrough>true</ac3passthrough>
<audiodevice>custom</audiodevice>
<channellayout>7</channellayout>
<customdevice>plughw:0,0</customdevice>
<custompassthrough>plughw:0,0</custompassthrough>
<dontnormalizelevels>false</dontnormalizelevels>
<dtspassthrough>true</dtspassthrough>
<mode>1</mode>
<passthroughaac>false</passthroughaac>
<passthroughdevice>custom</passthroughdevice>
<passthroughmp1>false</passthroughmp1>
<passthroughmp2>false</passthroughmp2>
<passthroughmp3>false</passthroughmp3>
</audiooutput>

root ~ # aplay -D plughw:0,0 /storage/music/Front_Center.wav
Playing WAVE '/storage/music/Front_Center.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono

DTS passthrough works fine, but AC3 doesn't. When playing a MKV with both DTS and AC3 soundtracks, DTS plays fine, when I switch to AC3, it keeps playing but my Amplifier still recognizes the audio stream as a DTS one. When I switch the amp to another source and back again it goes to pcm mode and it still keeps playing (2 channels). Sometimes it switches to Dolby Digital 5.1, but then there's no sound.

How to solve this AC3 passthrough problem ?

[edit]1.95.7 has the same problem

[edit2] I installed 1.95.7 on another machine, based on a AMD 780GM chipset, this works fine both AC3 and DTS passthrough work. So I can conclude the soundblaster usb is the problem.


RE: ac3 passthrough does not work with Sound Blaster MP3+ - vydernugadaa2 - 11-11-2020

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