All the examples in pdp use pdp_v4l. On two of the machines I tested (with different webcams and distros: ubuntu lucid 10.04 i386 and debian wheezy amd64) these only work with v4l2 (and thus [pdp_v4l2])
I wonder now-a-days what the statistics are with v4l and v4l2 devices and which are currently more 'representative' (i.e. is v4l still very widely used?)
Anyhow - Maybe the examples for pdp should also exist with pd_v4l2. Or maybe pd_v4l and pd_v4l2 could be encapsulated into, say, an abstraction which enables to chose. Not sure which would mean most work..
What do you think? Lorenzo.