MJPEG Tools Svn

Update the filter description section to use the new Y4M API

Lingering unneeded PRId64 definition.

Remove unused variables so warning errors don't appear at compile time.

Remove the PRID64_STRING_FORMAT and PRId64 stuff and simply use %lld. The
only 2 uses of PRID64 and PRId64 were two debug statements mpeg2enc/ratectl.cc,
putseq.cc). Interestingly enough all the other int64_t printing was already
done with %lld ;)

More build improvements:

o Concocted a "ACX_CONFIG_PREFIXED_HEADER" macro, to create an installable
config header (mjpegtools-config.h -- not used yet)
o Removed extraneous AC_SUBSTS (that are already created within macros).
o Re-instate "HAVE_LIBDV" ac_define, which was accidentally axed earlier.
o Changed "dv", "quicktime", "png" to be consistently "libdv", "libquicktime",
and "libpng".
o Account for those changes in 'lavtools/Makefile.am'.
o A little modernization of 'lavtools/Makefile.am'

Portability patch submitted by Jacob Meuser

Removed vestigial "-export-dynamic" from shared-library build options.

add a missing '-' in the long form of nonvideo-bitrate option

SVCD encoding/multiplexing has been working for a long time - check this item off the PLANS.

By popular demand 'a' was changed to 'A' for the sample aspect option