Recommendation for Starting Point

I need to develop a Linux based OMAP3530 system that can do the following:

1. Capture live video (and audio) at D1 resolution (720x480)
2. Pass the live video, without a memcopy(), to the DSP to encode into H.264
3. Write the H.264 stream (and compressed audio, audio codec TBD) to an SDHC card.
4. When not recording the system power needs to drop to 10mW or less.
5. The system needs to wake up (timer or stimuli) and being recording again within 1 second of the stimulus.

What Linux should I use as a starting point?

1. "Supported" or community?
2. If Supported, whose?  Does theirs support video capture and power management adequately?
3. If Community, which kernel source?

Thanks in advance for your suggestions and comments.