Timestamp drift when using dmix/dsnoop plugins with alsasrc/sink

[Alex Stefan Kaye]

It pains me to have to bring this up again, but I've had to come back to the dmix/dsnoop way of doing things, and this issue remains. However, I don't think it's got anything to do with timestamp drift as I thought previously, but some oddity with ALSA.

If I set GST_DEBUG to 5 on alsa* plugins, I get this message repeatedly:
alsa gstalsasink.c:1023:gst_alsasink_write:<alsasink0> Write error: Resource temporarily unavailable

I've attached a complete copy of the log.

On Fri, 8 Mar, 2013 at 10:42 AM, Nox Deleo <noxdeleo at googlemail.com> wrote:
Thanks for the suggestion, but I'm fairly sure I did that when messing around with the src/sink options, and it didn't seem to make any difference. Anyway, I managed to stop this issue in it's tracks today when I got rid of the dmix/dsnoop plugins (realised I didn't actually need to share my channels, just split them up) and used the route plugin instead. No problems whatsoever. So, maybe I screwed something up between the asoundrc for dmix/dshare and my GStreamer pipeline, or there's some weird issue between the two anyway.

On Mar 8, 2013 3:27 AM, "Nicolas Dufresne" <nicolas.dufresne at collabora.co.uk> wrote:
Le lundi 04 mars 2013 à 18:37 +0000, Nox Deleo a écrit :
I've tried adjusting buffer/sample sizes in my .asoundrc, messing with various options in alsasrc/sink, and even using a lowlatency kernel. These don't seem to do anything to diminish this problem. I could introduce latency problems by setting buffer/sample sizes too low, but this problem never changed at all, which makes me think it's not a straight latency issue.
Not that I have any solution here, but I'd like to mention that in this case it's not a latency issue but the audio clock speed not going the same speed as the selected clock. The distance can changed, in contrast with latency where the distance remain the same.

One question, any reason not to use the audio clock and slave the other clocks to the audio clock ?

Nicolas

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