Date: Fri, 16 Sep 2011 11:50:27 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: freebsd-multimedia@freebsd.org Subject: Re: /dev/dsp to RTP Message-ID: <20110916045027.GA95062@admin.sibptus.tomsk.ru> In-Reply-To: <20110913193919.GQ3098@funkthat.com> References: <20110912074323.GA81311@admin.sibptus.tomsk.ru> <20110913193919.GQ3098@funkthat.com>
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John-Mark Gurney wrote: > > Excuse me for asking in this developers' list, but I have tried > > freebsd-questions and Google without much success. > > > > What software can I use to obtain sound from /dev/dsp and multicast it > > into the network? I need no sophisticated codecs, HTTP interfaces etc. > > A plain 8-bit PCM sound that I could listen to with some multicast RTP > > client like VLC would do. > > > > Thanks in advance for any input. > > You could look at rat: > http://mediatools.cs.ucl.ac.uk/nets/mmedia/wiki/RatWiki#RobustAudioToolRAT > > It does contain a GUI though. It's be quite a few years since I used > it though... I remember once using mbone/vic, and there were also mbone/vat and mbone/rat, but the whole mbone directory is now gone from the ports tree. I cannot find rat in the ports tree any more. > > Other possibilities are ffmpeg or vlcserver. 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. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov@sibptus.tomsk.ru
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