Add option -lev/--level to raspvid to select H264 Level (#318)
Add option -lev/--level to raspvid to select H264 Level (#318)

Enable selection of Level 4, 4.1 and 4.2 for H264 codec.
Level will be automatically increased if necessary.
Additional preview buffer will be allocated for higher framerates.
gonzoua/userland,luked99/userland-1,kraj/userland,6by9/userland,adamheinrich/userland,maroviher/userland,gonzoua/userland,JamesH65/userland,maroviher/userland,6by9/userland,adamheinrich/userland,luked99/userland-1,kraj/userland,gonzoua/userland,adamheinrich/userland,JamesH65/userland,maroviher/userland,raspberrypi/userland,raspberrypi/userland,6by9/userland,luked99/userland-1,raspberrypi/userland,kraj/userland,JamesH65/userland