Date: Fri, 16 Sep 2011 10:52:54 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: freebsd-questions@freebsd.org Subject: Re: Need an audio multicasting solution Message-ID: <20110916035254.GC92792@admin.sibptus.tomsk.ru> In-Reply-To: <CAHieY7RQOFecrcCfSDtGjw-z1GU8RD8-%2BpkBpDkEaiu-usfppA@mail.gmail.com> References: <20110909062121.GA28440@admin.sibptus.tomsk.ru> <CAHieY7Tj-PyF52tRa8DMCdicqiOixLjSwT-QO67qT0PAirQyoQ@mail.gmail.com> <20110912055755.GA79151@admin.sibptus.tomsk.ru> <CAHieY7RQOFecrcCfSDtGjw-z1GU8RD8-%2BpkBpDkEaiu-usfppA@mail.gmail.com>
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Alejandro Imass wrote: > > > > > A quick look at Icecast showed that it does not support multicast either. > > It this true? If so, Icecast is completely useless for my scenario. > > > > AFAIK very few media streamers (or none) actually support real IPv4 > (Class D) Multicast. They support what is known as "application > multicast" akin to a multi-process/multi-threaded Web server. > > I don't know much about real IPv4 Multicast but I've heard it's not > that easy to do in the real world and would probably require > coordination with your ISP unless you're multicasting in a private > networks. I use multicasting in a corporate network. > Again, IMHO because I've never even attempted multicasting. It's fun and very pleasing aesthetically :) At least on Cisco. As to the original question. I have had some success with multimedia/ffmpeg, at least this: 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 have resulted so far in a severely distorted growl instead of normal voice. Does anybody know how to figure out the sampling rate and other parameters of the sound card? "cat /dev/sndstat" does not output anything really useful. > > Why do you need multicasting anyway? To save bandwidth mostly, and it's fun to setup :). Taking into account that I have PIM working across all our WAN links (an in-house monitoring/alarm system relies thereupon), it would be nice to use this infrastructure for sound too. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov@sibptus.tomsk.ru
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