Re: insufficient privileges to utilize real-time scheduling (SCHED_FIFO)

Hi,

On Tue, 6 Oct 2015, Nishant Prakash wrote:

> HI, I am trying to use Ecasound on Linux system to do recording but when I run the following command:ecasound -i alsa -o somefile.wav -c
> 
> I am getting this message and then it does nothing. 
[...]
> (eca-chainsetup) NOTE: Real-time configuration, but insufficient privileges to utilize real-time scheduling (SCHED_FIFO). With
> ... small buffersizes, this may cause audible glitches during processing.

that's not a fatal error. The recording is ongoing despite this warning. 
If you cannot hear anything in the resulting file, please check your 
mixer settings.

To adjust in real-time, run "ecasound -i alsa -o null -ev -c", issue 
"start" and then everytime you issue "cop-status" you get a amplitude
analysis. Adjust the mixer until "cop-status" starts showing you a signal.

For the real-time part, that depends on your distro. Most simple is to run 
as root, but that is not recommended. For instance on Ubuntu, following
is the best practise:
https://help.ubuntu.com/community/UbuntuStudioPreparation#Real-Time_Support

This allows to get more reliable recording during high load, but for 
casual use, not necessarily needed.

Br, Kai

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