CrossRoads:
(24 bits/(RGB LED) * 32 RGB LEDs/meter * 5 meters)/frame * 30 FPS = 115,200 bps.You have 32 RGB LEDs per meter? ~1/inch, okay, guess that makes sense.
Gonna need one big power supply too.
Can you increase the interface speed? The IDE will do 250,000. Not sure how efficient your code is to parse the data across the streams.
Sounds like 16 MHz 8-bit processor might bea tad underpowered.
Right, 115,200 bps per strip * 24. I'm not sure I could get an atmega to work, even it I had one per strip.
Trying to position the controller(s) close to the strips. I suppose it would be feasible to use one SPI port and 24 select lines, but the SPI port would need to run at nearly 3 megabits.