MJPEG Tools Svn

Further speedup of the non-MMX/SSE SAD functions - shortcut the computation if
the current block has become worse than previously seen blocks.

Use inline abs() in the uv_noaccel case (saves an intermediate variable and
calculation).

Add -X to allow bypassing the SIMD (SSE/MMX) routines.
Rewrite the SAD (Luma only) routines to use pointer arithmetic and the
(builtin) abs() function. This speeds up processing almost 25% on a 1GHz G4/PPC

char -> int, seems some systems use unsigned char as the default

Typo and phrasing fixes.

Cleanup and use mjpeg_error instead of printf to stdout. Actually the callback
mechanism could be simply be inlined in lavrec_msg/lavplay_msg since the 'info'
pointer isn't passed thru to the callback routine.

Couple typos fixed. Tweek the wording in a few places so it reads better.

fix the off by 1 byte error (borrowed the stream closing code from toolame).
DVD Studio Pro now accepts mp2enc generated .mp2 files.

The frame number was never incremented - resulting in:
INFO: [mp2enc] Avg slots/frame = inf; b/smp = inf; br = inf kbps
Also, the messages were tidied up a little.

Add --with-extra-cflags to make it easy/convenient to add extra compiler
flags (such as -funroll-loops and so on).