DTS not working on Open ELEC 4.06 (Gotham 13.1)
#1
Hi there

I can't figure out how to get my Rasp. Pi working with my sound system over DTS. I've got the follwing set up:
-Rasp Pi v2 (512MB RAM) with Open ELEC 14.06
-Delock HDMI Stereo / 5.1 Kanal Audio Extractor
-Logitech Z906 Sound System (connected over TOSLINK)
-Samsung LED-TV UE40F6340SS

I've set the audio settings in xbmc to "passthrough" and activated "dts capable receiver" none the less it seems that the Pi is transcoding the audio to stereo (on the audio system the "decode"-led is not activated but instead the indicators for stereo sound). Additionally the Pi is also rather slow, which is another reason to think that it's trancoding the audio instead of simply passing it.

In this article http://wiki.xbmc.org/index.php?title=PulseAudio they say you have to set the audio to 2.0 even if you want to pass 5.1 sound. I did that, it doesn't help either.

Another thing I did was adding the line "hdmi_force_edid_audio=1" to my config.txt, no effect either.

In this article http://reicheltpedia.de/index.php/Media-...spberry_Pi the author succeeded with the Delock device, so I really can't see why it's not working with my set up.

Can anybody give me a hint on this?

Thx a lot in advance!

Regards
Simon
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#2
Post a debug log file and that will show if DTS is using passthrough.
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#3
Thx for your reply! Here you go: http://xbmclogs.com/show.php?id=239940
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#4
Passthrough is not enabled:
Code:
14:48:19 T:2673865808   DEBUG: COMXAudio::Initialize device passthrough 0 hwdecode 0

because the audio is not DTS/AC3, but AAC
Code:
14:49:15 T:2763228240    INFO: ffmpeg[A4B38450]:     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 319 kb/s

AAC passthrough doesn't exist, so you'll need to find video files that use DTS or AC3, or convert them (perhaps with this
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#5
haven't checked if the PI does support it, but there is an option to convert any surround sound to AC3 which should help in your case. PI will most likely stay maxed out though. This is at least working on my Windows based HTPC with SPDIF
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#6
(2014-07-03, 18:20)da-anda Wrote: haven't checked if the PI does support it, but there is an option to convert any surround sound to AC3 which should help in your case. PI will most likely stay maxed out though. This is at least working on my Windows based HTPC with SPDIF

Decoding audio and reencoding to AC3 is going to be too much on the Pi.
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#7
Thanks a lot for this helpful answers!

I'm a linux user. So which program/command would be the most straight forward to convert the 5.1-sound of any video-file to dts? My guess is that it could work well with ffmpeg...
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DTS not working on Open ELEC 4.06 (Gotham 13.1)0