Taking off from this old thread:
I have found similar problems for Mac OS X 10.6 Snow Leopard clients playing Wowza RTSP streams using Apple/QuickTime H.264 video.
Through Wowza RTSP, Apple H.264 content plays back extremely choppy – basically unwatchable – on Snow Leopard systems in QuickTime X, QuickTime 7, or embedded in Safari. It plays much better in VLC or embedded in Firefox. The same content plays fine in all programs through Darwin or QTSS, or through Wowza using RTMP or HTTP.
All I did was:
Export the Extremists.m4v file as baseline H.264 video in a MP4 container using QuickTime Pro
Set up a new VOD application in Wowza
Play the new file via Wowza RTSP on a Snow Leopard system (QuickTime X, QuickTime 7, or embedded in Safari)
I also see the choppiness in live RTSP H.264 streams from QuickTime Broadcaster (although I know that’s not baseline video).
The original Extremists.m4v demo file streams perfectly everywhere, but I notice its video codec is libx264, while QuickTime-exported MP4 files use the Apple H.264 codec (which is what we use, unfortunately).
I would be happy to do any further troubleshooting for this; if this gets solved, we can probably switch to Wowza exclusively and ditch Darwin/QTSS.