Video Quality for RTMFP on Linux

I'm developing a video chat-like application using RMTFP and Stratus.  So far, I'm having good success.  I can build from source, tweak settings, and get video and audio in both directions.
There's one glaring problem I haven't been able to solve, however -- when using a client on a Linux machine, the video received by the other end looks very poor.  It's blocky and pixellated, almost as if it's rendering 160x120 in a much larger frame.   When sending from a Mac (my other dev machine), the video looks quite good.
I've tried modifying all the settings I can think of -- frame rate, "quality", size, audio settings -- with no discernible improvement.  I've tried running it as a local file and from a remote server.  The network where I'm working is extremely fast, so that shouldn't be an issue.
Is there anything else I can try?  Any suggestions or ideas are greatly appreciated.
Many thanks!

New problem.
I changed my DV Output to DV Locked.  Plugged my camcorder back into the firewire.  Created a new project with a connection device 'DV Camcorder'.  The popup window comes up, and tells me my capturing Source is 'Microsoft DV Camera and VCR'.  I tried selecting HDV as my connection device earlier and it said I didn't have one connected.
Now, with my previous project, all I had to do was click 'Capture' and the it simply worked.  Now, I'm not getting anything to work.  It just sits there.  Do I have something configured incorrectly?
My project settings are:
Editing Mode: DV NTSC
Timebase: 29.97 fps
Frame Size: 720x480
Pixel Aspect Ratio: D1/DV NTSC Widescreen 16:9
Fields: Lower Field First
Capture format: DV
Video Rendering
File Format: MSFT AVI DV NTSC
Compressor: DV NTSC

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