From owner-freebsd-multimedia@freebsd.org  Tue Aug  7 09:17:31 2018
Return-Path: <owner-freebsd-multimedia@freebsd.org>
Delivered-To: freebsd-multimedia@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id CE44A10545F1
 for <freebsd-multimedia@mailman.ysv.freebsd.org>;
 Tue,  7 Aug 2018 09:17:31 +0000 (UTC) (envelope-from hps@selasky.org)
Received: from mail.turbocat.net (turbocat.net [88.99.82.50])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 6F190856AB
 for <freebsd-multimedia@freebsd.org>; Tue,  7 Aug 2018 09:17:31 +0000 (UTC)
 (envelope-from hps@selasky.org)
Received: from hps2016.home.selasky.org (unknown [62.141.128.70])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by mail.turbocat.net (Postfix) with ESMTPSA id E688F2600DC;
 Tue,  7 Aug 2018 11:17:22 +0200 (CEST)
Subject: Re: Choppy audio using virtual_oss
To: =?UTF-8?Q?Goran_Meki=c4=87?= <meka@tilda.center>
Cc: freebsd-multimedia@freebsd.org
References: <20180807003145.7m55dlakppucpkt2@thinker.home.meka.rs>
 <57293b09-97c6-8b89-24eb-2497529f2ba5@selasky.org>
 <20180807085240.mcyaj2siqwtydjyj@hal9000.home.meka.rs>
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <95ed28ae-57a4-ede0-274c-3ae863d4eb0b@selasky.org>
Date: Tue, 7 Aug 2018 11:17:01 +0200
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101
 Thunderbird/52.8.0
MIME-Version: 1.0
In-Reply-To: <20180807085240.mcyaj2siqwtydjyj@hal9000.home.meka.rs>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 8bit
X-BeenThere: freebsd-multimedia@freebsd.org
X-Mailman-Version: 2.1.27
Precedence: list
List-Id: Multimedia discussions <freebsd-multimedia.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-multimedia>, 
 <mailto:freebsd-multimedia-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-multimedia/>
List-Post: <mailto:freebsd-multimedia@freebsd.org>
List-Help: <mailto:freebsd-multimedia-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-multimedia>, 
 <mailto:freebsd-multimedia-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 07 Aug 2018 09:17:32 -0000

On 08/07/18 10:52, Goran Mekić wrote:
> It gives best results so far, as ardour chops less, but it still does it
> few times per second, not a constant "rrrrr" sound on top of mix.

Try to use 4 ms buffering, both hardware and software.

What is the buffer settings for ardour. I've seen some silly OSS 
applications which put one and one sample by write() request to 
/dev/dsp. I will not work.


Can you ktrace ardour and see how many bytes it is writing at a time to OSS?

--HPS