For whatever reason, mjpegtools on this system always uses '-mcpu=i686 -march=i686'. Wouldn't be that big of a deal except that this machine's processor is a VIA C3-1G, the bastard cousin of the K6. For whatever reason, the configure script has also decided that cmov support should be enabled, which isn't in the C3-1G's instruction set (cmov is an optional instruction.) This causes a number of "unexplainable" mpeg2enc/etc. crashes. Reproducible: Always Steps to Reproduce: 1. 2. 3.
I have also just seen this in the latest stable build (1.6.1.90-r1).
As far as i can see configure never actually checks for the precence of the instruction but rather just checks if --disable-cmov was given and then disables it. mpcu/march comes from checking if cmov is enable and if enable do uname -m and then based on it set mpcu/march else set it to i586. It should maybe have something like what is described in this gcc-maillinglist message (http://gcc.gnu.org/ml/gcc-patches/2003-09/msg00217.html)
In that case, it should just be a matter of grep -q cmov /proc/cpuinfo || myconf="$myconf --disable-cmov" But maybe the whole flag generation part of the configuration should be removed and replaced with the user CFLAGS...
Applied this and version bumped. Please test, and reopen if not working.
