Re: [ecasound] Problems with recording

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Subject: Re: [ecasound] Problems with recording
From: Jeremy Hall (jhall@uu.net)
Date: Tue Mar 20 2001 - 19:39:22 EET

I too have seen some wierd problems with emu10k1 and see better
performance for some strage reason through native alsa mode. I can set
buffersize to 256 only (smaller buffers make bad noises) 512 is better at
the expense of some latency.

_J

In the new year, Kai Vehmanen wrote:
> On Mon, 19 Mar 2001, Remco Poelstra wrote:
>
> > I recorded a song from my md to my computer.
> > I used ecasound -r -i /dev/dsp -o file.wav
> [...]
> > My system was doing nothing and my harddrive could handle it with ease.
> > Still there are glitches in the recording. How is this possible?
> > I've a SB Live! with Asus A7V motherboard and Maxtor harddrive.
>
> Unfortunately this is possible. For instance if your drive is not properly
> tuned, or you have a bad kernel version for streaming (some 2.4.0test
> kernels were pretty bad), some write() operations might take so long that
> /dev/dsp buffer overflows... This is a kernel-level problem (disk i/o
> latency), so even raising the priority -r won't help. This is precisely
> the reason why I've wasted so much time into the new disk streaming
> subsystem. I recommend you to try it:
>
> ecasound -r -i /dev/dsp -o file.wav -z:db
>
> > Is this perhaps more an alsa problem, or badly behaving hardware. I really
> > can't believe it's a problem in ecasound, because it has time enough to
> > record it.
>
> This is always a possibility. Although 0.9.x ALSA is getting more stable
> all the time, it's still beta and contains lots of recently modified code.
> As the OSS API has no mechanism for reporting buffer xruns, you should use
> the ALSA native interface and add -z:xruns to the cmd-line (requires
> ecasound 1.9dev2 or newer). So if you are using the new ALSA 0.9.x ...
>
> ecasound -r -i alsahw,0,0 -o file.wav -z:db -z:xruns
>
> This way the recording will stop if xruns occur... If you still get
> glitches (no xruns reported), then it's probably a hw-related problem.
> ... with older ALSA releases, replace "alsahw,0,0" with "alsa,0,0".
>
> --
> http://www.eca.cx
> Audio software for Linux!
>
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