Hello from Chicago,
I have built ffmpeg for OS X before. You say you need it for OS X 10.5 ? One of my Macs has 10.6.8 and I can still generate 10.5 binaries for 32/64 bit. Just let me know if I understood that correctly that you really need for 10.5. Please realize, that there are come runtime compatibility issues with certain system libraries like SystemB between 10.5 and 10.6+ So be sure to indicate that you ONLY need it for 10.5. I can also built it for 10.6+ if you need.
Can you tell me your timeframe? I have two urgent project that must be completed by this Wednesday 9PM CST.
How big of a hurry are you in?
If you want to grab the git repository and zip it so that we don't waste any time with the possibility that the wrong one is built, that would be great.
Mark