Subject: Re: [ecasound] sync. problems on simple project
From: Jeremy Hall (jhall_AT_uu.net)
Date: Thu Nov 15 2001 - 19:17:47 EET
the sblive can't use less than 512 buffer (-b) you'll also want to make
sure you're using the ALSA drivers.
_J
In the new year, [Daniel Clark] wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Hi,
>
> I like the look of ecasound - the command-line
> interface seems pretty intuitive. Just some teething
> problems I think. I'll just list the kit I have, in
> case it's relevant to performance: I'm using Pentium
> 850 Hz / 512 MB RAM / Mandrake 8.0 / Ecasound 2.0.3 /
> Soundblaster Live Platinum (with OSS drivers).
>
> The problem
> ===========
> I'm just trying to record 2 tracks. I record the 1st,
> then record the 2nd, play both back & find a delay
> (e.g. 0.25 seconds) between them, where the 2nd track
> always sounds late.
>
> I've tried all the relevant options (and all in
> combination) I could think of from reading the
> howto/faq:
> (a) -r option
> (b) running as root
> (c) -z:db
> (d) -b:256 (reducing buffer size)
> ...but none works reliably.
>
> I've also tried shutting down to console mode only &
> monitoring the CPU and RAM, but neither seem to be
> overloaded.
>
> I can illustrate it best by running:
> ecasound -i:/dev/dsp -o:/dev/dsp
> ...then tapping the microphone sounds slightly late on
> the speakers.
>
> If I start a new shell, then try this again
> (regardless of which of the above options I choose),
> it's sometimes o.k. (i.e. no delay), but then running
> the exact same command afterwards & there's a delay
> again.
>
> Does it make a difference to run in interactive mode
> (-c) & exit cleanly, rather than exiting with
> control-C? This doesn't seem to make a reliable
> difference.
>
> Questions:
> ==========
> Is it unreasonable to expect better performance with
> the kit I have?
> Is there an easy way to sync. the tracks later (e.g.
> cut white noise off the beginning of track 2)??
> Is there temporary info. stored between invocations of
> ecasound? is there a buffer I could clear before
> running it?
>
> Any suggestions/pointers would be much appreciated.
> Thanks,
> Dan.
>
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