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QT Broadcaster & Formac DV on same machine: audio issues

While I'm waiting for our networking and computer support people to figure out why our multicast is not getting to all Windows clients on our LAN (either a switch/router config issue or a Windows registry issue [see: http://www.winguides.com/registry/display.php/729/]), I am trying to streamline our system for re-broadcasting our local University TV signal over our LAN.

Here's what I started with that worked fine but tied-up a lot of equipment:

1 Dual-gig G4 with Formac DV. Input from the TV cable, analog output to a Sony DVMC then to a second Dual-gig G4 running QuickTime Broadcaster 1.0.1 sending out the multicast using MPEG-4 for both audio and video. QuickTime 6.1.1 throughout.

Here's my only semi-successful attempt to use both QT Broadcaster & Formac DV on the same machine:

Using either Formac's "StudioTVR" or Mitz Pettel's "Vidi," I tune in the desired video signal and note that both audio and video are of excellent quality. Vidi has a neat little Control Panel that allows one to switch channels and make video (not audio) adjustments during a broadcast so I favor it.

Quitting the tuner software, I crank up QT Broadcaster and set it up for a high quality multicast using MPEG-4 for both audio and video. I check the video and audio (via Play Through Speaker) and note that both are excellent.

Starting the broadcast and exporting a movie to pick up the multicast on other computers, I note that, on the receiving computers in my office, the video is excellent but the the audio is frequently punctuated with a staccato blip blip blip ..... that is as if the sound is being cut out at a pretty fast rate. Needless to say that these episodes, which seem to increase in frequency over time, render speech unintelligible, thereby making the broadcast pretty useless.

Apparently, QT Broadcaster is snagging the source internally since the sound pref panel has no effect as far as I can tell. What I would like to know is why these audio "spasms" are occuring and, most importantly, how to work around this issue so that I'm not tieing up two machines and going analog to digital and back again.

Switching the audio to Qualcom's PureVoice at full rate produces a "ChipMunk" sounding audio with a cyclical pattern of static overlayed on top of that. Much worse.

So, how can I get intelligible audio with this single machine setup.
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Dr. Frank Lowney email@hidden
Director, Electronic Instructional Services, a unit of the
Office of Information and Instructional Technology,
Professional Pages: http://www.gcsu.edu/oiit/eis/
Personal Pages: http://www.faculty.de.gcsu.edu/~flowney
Voice: (478) 445-5260
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We don't make instruction effective, we make effective instruction more accessible.
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