MJPEG Tools Svn

- add 1 to mmx version as found by Stephen Beahm:

Both the C-reference and altivec versions of bsumsq_sub22_mmx() implement the
following:
v = ((p1f[i]+p1b[i]+1)>>1) - p2[i];

The mmx version does not add the one (+1).

- make twos[] static, so it doesn't have to be pushed on the stack everytime the function sumsq_mmx() is called

Stephen Beahm noticed that the mmx code had not been updated like the
C-reference and Altivec code had been (2003/10)

free() getting a bogus pointer because simd_env is modified by parse_next.
Another fine patch submitted by Stephen Beahm ;)

Missing emms() spotted by Stephen Beahm - thanks!

Couple missing '-' to turn multithread into multi-thread (so it matches the
mpeg2enc program usage).

Fix obscure threading issue due to the last frame being read
while the corresponding StreamState is being set.

By popular demand (well, ok - I got one request to add it ;)) a simple
histogram program for YUV4MPEG2 streams is added. It's a simple program
created years ago to spot colorcast problems.

Fix invalid memory access

it is slower, it is not yet ready for everyone, but it does remove noise
a lot better ...

Control it's behavior with (spatial) -Y [n] -U [n] -V [n] and (temporal) with
-y [n] -u [n] -v [n]

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