Date: Mon, 25 Aug 1997 19:24:54 -0700 From: Amancio Hasty <hasty@rah.star-gate.com> To: Denis DeLaRoca <CSP1DWD@MVS.OAC.UCLA.EDU> Cc: multimedia@FreeBSD.ORG Subject: Re: guspnp17 and vat/rat Message-ID: <199708260224.TAA07033@rah.star-gate.com> In-Reply-To: Your message of "Mon, 25 Aug 1997 16:13:00 PDT." <199708252312.QAA19291@hub.freebsd.org>
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Hi, I am going to work on this problem this week . Louis has reported a similar behavior with playing continous mpeg streams. Tnks, Amancio >From The Desk Of Denis DeLaRoca : > Amancio, > > I am testing guspnp17 with both rat (v3.0.23) and vat (v4.0b2) with > today's MBONE broadcast of the Stanford channel. With vat I am using > your version of the audio-voxware.cc. > > Vat seems to get periodically into conditions where the audio is dis- > torted: what sounds like rumbling noise plus echoing or ghosting. Rat > in comparison yields consistently good audio with no audible distortion. > > What is going on? To begin with, my loss on received packets is not > excessive, typically 1%, at times and very briefly 5%. Stanford's > transmission doesn't use redundancy so rat is running in vat-mode > so to speak. I have a suspicion that the observed conditions have > to do with how vat is scheduling audio packets via audio-voxware.cc. > Since we don't have the source to rat we can't see what they are doing > right... any guesses? > > -- Denis >
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