why uncompressed? So much wasted diskspace, so slow to save and load (disk drive speed is a big bottleneck). You might want to use lossless compression like Lagarith codec, compresses faster than uncompressed writes to disk. (unless perhaps you have solidstate drives ;-)

Lagarith is free and lossless. Yet similar to mp4 - it's a bit like that compression tool, ICEOWS, which is wavelet based but also lossless and thus uuseful for data