Kodi Community Forum

It seems that their is something up or has changed with the audio, I had my set up playing digital out and the last few builds now my videos play really quickly and no audio, and then eventually barfs out with an error.

ALSA lib pcm.c:2144snd_pcm_open_noupdate) Unknown PCM IEC958:AES0=6
Segmentation fault (core dumped)

I have changed nothing but I was out at the game developers conference for a few days and just wanted to update.

You're not alone:
http://forum.xbmc.org/showthread.php?tid=31361

i'm going to revert this change now. should never require something to exist

<edit>
didn't revert, but commited an alternate approach, pleas test
</edit>

hmm I seem to be getting the same results this morning.. Sat.

ALSA lib conf.c:3949snd_config_expand) Unknown parameters AES0=6
ALSA lib pcm.c:2144snd_pcm_open_noupdate) Unknown PCM default:AES0=6
Segmentation fault (core dumped)


more info from the log


and a bit further down when playing back a movie

wonder if i managed to commit. maybe i didn't.

<edit> i hadn't, now i have, try again </edit>

Still not working, well let me rephrase that, AC3 or digital out audio doesn't work, normal 2 channel audio works.

with my .asoundrc enabled.. playing a video with ac3 audio.

with the .asoundrc removed playing a ac3 movie.


some info from the xbmc log




then a bunch of this


if i hit x to stop the video it core dumps..

this is w/o .asoundrc

with .asoundrc set same file played, no audio, hitting x also core dumps



conclusion.

2 channel audio files work, anything with digital audio ac3, dolby plays fast with no audio.

sorry for all the pastes, if you need more info i can submit all data to a pastbin

Just made a test with build 11793 and i have the exact same results as gateway69. But i tested only without .asoundrc because i don't have one...

stupid damn alsa. why are they segfaulting on invalid device string...

oh and why are you guys using default as device? it doesn't work with the default of iec958?

I should probably only apply those options if it is iec958 thou. So if you use a custom string, it won't be overridden.

Originally way back when it was recommended to use the demo-asoundrc or what ever the file was to your root, I made a small change since my digital out was on device 1 and not 0, so I just use default for both options in XBMC, I can remove it if its not needed anymore, but thats not the issue since I tried it with out both options.

was their a Ubuntu update recently with a new alsa driver or something?

let me know if you want me to test anything new.

now it only applies the AESX=XX options if your devicestring is iec958, (since that is probably the only one that can take those options)

on my ubuntu the iec958 pcm device is defined in /usr/share/alsa/pcm/iec958.conf

elupus Wrote:oh and why are you guys using default as device? it doesn't work with the default of iec958?

On my HTPC with AuzenTech X-Mystique sound card, using iec958 as the passthrough device does not work -- it results in the fast video/no sound problem. Using 'default' works fine and the sound appears to be passing through my toslink out as expected into the audio receiver.

On my HTPC with Sondigo Inferno sound card, using default as the passthrough device does not work. Using 'iec958' works fine and the sound appears to be passing my toslink out as expected into the audio receiver.

Both systems are running Ubuntu 7.10. The system with the Inferno sound card has a newer build of ALSA (1.0.16) since the one that ships with Ubuntu 7.10 (1.0.14) doesn't support the Inferno but 1.0.16 does. I'm not sure if it that or just the difference in the sound card modules that cause the discrepancy as to what device I have to use to get good sound from XBMC passthru. I just tinkered around with each box enough to get things running well and called it a day, but if you need any debug info that is specific to either of the two sound cards I run, let me know.

my problem seems to be fixed with the audio and fast playing videos that are non a3c both of my xbmc settings are set to default.

I'm not getting fast video but I do not think I'm getting full surround properly either. IMO we need a set of test sounds to check for proper playback while we're at it

Here's a test sound you can use:
http://www.lynnepublishing.com/surround/...d_test.ac3
It's my standard to make sure I'm getting sound to all the channels.

She has some neat surround sound music to download too.

Thank you!

Edit: Okay, it's coming across as Dolby Digital playing those samples so it looks like my encoding is at fault. Might try muxing one of them with a vid and see how that works out - perhaps it's just my tools. Oddly when I play the surround test as THX it's fine but as Dolby Digital it's not playing the rear channels. Probably something stupid on my part, I admit some of this sound stuff screws with my head. That sample does appear to be a good one for testing. Has to be played as "music" FWIW.