2015-05-11, 02:51
Hi all;
(Really enjoying Kodi! Longtime XBMC user).
Having a bit of an issue with hires FLAC files. My CD's are ripped on another Linux machine (using flac through abcde) though I've got some really nice piano recordings bought from 2L.no - some are 96/24 2.0, some are 192/24 5.1.
The computer runs Ubuntu 14.04 and is connected asynchronous USB to a nice DAC. The DAC will accept a number of input frequencies. Nothing is stored on the PC, my content lives on a NAS in another room. The PC is very understressed, usually hovers well under 20% CPU utilisation and over 6GB free RAM.
Was running Pulseaudio with best quality resampling filters (src-sinc-best-quality) though I've since disabled Pulseaudio and am running ALSA direct to hardware (no mixer), which on Redbook content sounds great, and also good on 48kHz sources. Raising the source frequency higher starts to introduce sibilance, it's audibly notable on 96kHz content and awful on 192kHz. This doesen't change when I'm running ALSA direct to hardware or whether I'm running a moderately fast resampler in PulseAudio (e.g. speex-5 or speex-10).
Tearing my hair out with what this might be - my previous install (XBMC pre-Kodi) didn't do this (it also used another DAC, though the testing above would seem to exclude this as a possibility, albeit indirectly).
Could it have something to do with the way FLAC is played/uncompressed/etc in Kodi? Is there anything I can do to change it? (Have I missed some sort of 'audiophile settings'?) I note there's a resample engine in audio settings - does stopping Pulseaudio render this ineffective?
Really keen to get this working properly! The 2L.no tracks sound absolutely amazing for any audiophiles out there (totally worth the purchase). Any help appreciated.
(Really enjoying Kodi! Longtime XBMC user).
Having a bit of an issue with hires FLAC files. My CD's are ripped on another Linux machine (using flac through abcde) though I've got some really nice piano recordings bought from 2L.no - some are 96/24 2.0, some are 192/24 5.1.
The computer runs Ubuntu 14.04 and is connected asynchronous USB to a nice DAC. The DAC will accept a number of input frequencies. Nothing is stored on the PC, my content lives on a NAS in another room. The PC is very understressed, usually hovers well under 20% CPU utilisation and over 6GB free RAM.
Was running Pulseaudio with best quality resampling filters (src-sinc-best-quality) though I've since disabled Pulseaudio and am running ALSA direct to hardware (no mixer), which on Redbook content sounds great, and also good on 48kHz sources. Raising the source frequency higher starts to introduce sibilance, it's audibly notable on 96kHz content and awful on 192kHz. This doesen't change when I'm running ALSA direct to hardware or whether I'm running a moderately fast resampler in PulseAudio (e.g. speex-5 or speex-10).
Tearing my hair out with what this might be - my previous install (XBMC pre-Kodi) didn't do this (it also used another DAC, though the testing above would seem to exclude this as a possibility, albeit indirectly).
Could it have something to do with the way FLAC is played/uncompressed/etc in Kodi? Is there anything I can do to change it? (Have I missed some sort of 'audiophile settings'?) I note there's a resample engine in audio settings - does stopping Pulseaudio render this ineffective?
Really keen to get this working properly! The 2L.no tracks sound absolutely amazing for any audiophiles out there (totally worth the purchase). Any help appreciated.