doc: Fix syntax and logical errors in avconv stream combination example

Bug-Id: 661
CC: libav-stable@libav.org
ismindex: handle time discontinuities and nonzero start time

The input file may not have consistent start times, stream durations and
chunk durations. This patch at least removes negative durations that
make chromecast unhappy, and correctly sets starting time on chunks so
that the split (or .ismf) outputs match the manifest.

Signed-off-by: Martin Storsjö <martin@martin.st>
configure: Split adding of CFLAGS and CPPFLAGS for hardened toolchain
configure: Disable i686 for i586 and lower CPUs
dca: K&R formatting cosmetics

Signed-off-by: Diego Biurrun <diego@biurrun.de>
wip: interactive reporting

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
avdevice: Add Blackmagic Design Decklink capture
bmdenc: cleanup

Small improvement. still WIP.
bmdenc: Set the stream timebases correctly

Fix the timestamps reported.
bmd: support new api
bmd: Update to to use the timebase