From owner-freebsd-multimedia@FreeBSD.ORG Mon Sep 19 06:12:46 2011 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B20C9106564A for ; Mon, 19 Sep 2011 06:12:46 +0000 (UTC) (envelope-from vas@mpeks.tomsk.su) Received: from relay2.tomsk.ru (relay2.tomsk.ru [212.73.124.8]) by mx1.freebsd.org (Postfix) with ESMTP id 03FFD8FC08 for ; Mon, 19 Sep 2011 06:12:45 +0000 (UTC) X-Virus-Scanned: by clamd daemon 0.93.1 for FreeBSD at relay2.tomsk.ru Received: from admin.sibptus.tomsk.ru (account sudakov@sibptus.tomsk.ru [212.73.125.240] verified) by relay2.tomsk.ru (CommuniGate Pro SMTP 5.1.13) with ESMTPSA id 20469596 for freebsd-multimedia@freebsd.org; Mon, 19 Sep 2011 13:12:43 +0700 Received: from admin.sibptus.tomsk.ru (sudakov@localhost [127.0.0.1]) by admin.sibptus.tomsk.ru (8.14.3/8.14.3) with ESMTP id p8J6CgTK051133 for ; Mon, 19 Sep 2011 13:12:42 +0700 (OMSST) (envelope-from vas@mpeks.tomsk.su) Received: (from sudakov@localhost) by admin.sibptus.tomsk.ru (8.14.3/8.14.3/Submit) id p8J6CgpP051132 for freebsd-multimedia@freebsd.org; Mon, 19 Sep 2011 13:12:42 +0700 (OMSST) (envelope-from vas@mpeks.tomsk.su) X-Authentication-Warning: admin.sibptus.tomsk.ru: sudakov set sender to vas@mpeks.tomsk.su using -f Date: Mon, 19 Sep 2011 13:12:42 +0700 From: Victor Sudakov To: freebsd-multimedia@freebsd.org Message-ID: <20110919061242.GA50407@admin.sibptus.tomsk.ru> References: <20110912074323.GA81311@admin.sibptus.tomsk.ru> <20110913193919.GQ3098@funkthat.com> <20110916045027.GA95062@admin.sibptus.tomsk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110916045027.GA95062@admin.sibptus.tomsk.ru> User-Agent: Mutt/1.4.2.3i Organization: AO "Svyaztransneft", SibPTUS X-PGP-Key: http://www.livejournal.com/pubkey.bml?user=victor_sudakov X-PGP-Fingerprint: 10E3 1171 1273 E007 C2E9 3532 0DA4 F259 9B5E C634 Subject: Re: /dev/dsp to RTP X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Sep 2011 06:12:46 -0000 Victor Sudakov wrote: > > Multicasting with ffmpeg works fine. The command line > ffmpeg -i file.mp3 -acodec copy -f rtp rtp://239.8.8.8:5000 -re > > does send a multicast stream which can be listened to with VLC (but > not mplayer for some reason) on multiple hosts. > > Now I need to figure out how to stream live sound from /dev/dsp. All > my attemps to record sound from a USB audio interface, as simple as > > ffmpeg -f oss -i /dev/dsp1 out.wav > > have resulted so far in a severely distorted growl instead of normal > voice. Do you know how to figure out the sampling rate and other > parameters of the sound card? "cat /dev/sndstat" does not output > anything really useful. > > The audio interface is not to blame because I use it all the time with > linphone for SIP calls. I have tried with a different soundcard and the following command line: ffmpeg -f oss -i /dev/dsp -acodec mp2 -f rtp rtp://239.8.8.8:5000 -re seems to work fine. However, the delay of voice is about 2-3 seconds. If I use the libmp3lame codec instead of mp2, the voice quality degrades. I don't know what the problem with the first audio interface is, so that linphone works fine but ffmpeg records distorted sounds. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov@sibptus.tomsk.ru