This change adds a check for the V4L2_CAP_VIDEO_CAPTURE capability of
the video device found on devfs. This will filter out 'metadata' device
nodes that may be present on devfs at some /dev/videoN path.
Fixes#6276
Enable warnings for both. Favour casting to signed rather than casting to
unsigend for comparisons. Per isocpp's core guidelines ES.102, signed
arithmetic gives more expected results. If we need one extra bit of range,
using longer signed types achives that.
Fix#6010Fix#6012
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