Are we testing the same sample here?
http://kodi.wiki/view/Samples --> FLAC 5.1 24-bit 192kHz audio-only sample (thanks HomerJau) -->
https://drive.google.com/file/d/0B67BGV ... hFXzA/view -->Beck - Sea Change (DTS-HDMA 24-192kHz 5.1 (45sec).flac
Plays fine at least on my setup with recent october build and Onkyo TX-NR616 AVR with a HDMI 2.0 Cable. My guess about the cable being the issue is not because of high or low quality cables, but about the used standard (HDMI 1.3, HDMI 2.0 etc.). But the issue might certainly be something else and I'm just having luck that it works on my AVR. I remember that 2 years ago OpenELEC had an issue with DTS passthrough on my AVR, but not on denons hmm... they got it fixed, so perhaps this here is similar and onkyo is on the lucky side this time.
Here's the OSD output of my Onkyo playing the above mentioned Multi Channel FLAC:
And here's the same file played on the Raspberry Pi2:
As far as I know the Raspberry Pi series is not capable of outputting 192kHz / 24Bit if multichannel. It downsamples depending on the bandwidth. Stereo should work with 192/24.
So comparison with Raspberry Pi does not really help here. Perhaps better post the settings you've changed in Kodi/Settings/Audio tab.. my be there is something different.
@
jaro_kr
You say mkv file is played fine... could you please provide the information your AVR displays about the played audio stream? I mean like I did with the OSD screenshot. What sample rate and how many channels does the AVR see there, if playing the mkv. Perhaps mkv is downsampled and although it has 192/24 inside, your AVR only gets 48kHz or so sent from the C2.
If I try the FLAC, then I have M-PCM 192/24 bit with 7.1 like screenshot shows (but media info says it is a 6ch flac, not 8ch hmm...)
If I play the mkv, then Receiver switches to DTS-HD MSTR 192kHz with 5.1 channels (matches the media info: 6ch). So this takes less bandwidth, just as an example. (I still guess, that the cable might make a difference, but who knows hm :/).