MJPEG Tools Svn

After climbing the wall trying to find one corrupt frame in a huge
.avi I was compressing to MPEG (probably due to a buffer over-run when
the file-server went off and did its own thing for a bit...) I have
now modified readpic.c to give warnings but not crash if a dud frame
is encountered. In this case mpeg2enc now simply re-uses the previous frame to
keep things reasonably invisible.

Relaxed constraints on audio buffering to allow use with less flexible
sound-cards. Code now permits only simple double-buffering (2 frags)
and bugger (frag) sizes of only 4096. The drivers for some modern PCI
cards don't like delivering the larger (8192 byte) frags and 8 buffers
demanded by the original code.
Added code to run audio capture as a X/Open real-time thread rather
than as a seperate ordinary process. This should obviate the need
for so many / such large frags.

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Additional optimisation of motion compensation search algorithm.
MMX2 routines for fast final interpolated search...

The latter could probably be optimised a little by better interleaving
of instructions.

Some additional cleanup - checked in v4l-conf and lavvideo.c

libmovtar is slowly emerging from the smoking ruins of the buz_tools,
more powerful and comfortable than ever before ...
libmovtar: read support for movtar (integrated in lavplay, quite alpha)
started to port utilities. movtar_play moved into movtar/
(and adapted to libmovtar)

This commit was manufactured by cvs2svn to create tag 'ASInitialMerge'.

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A.Stevens Initial merge (back) in of auxiliary tools in sub-dirs

This commit was manufactured by cvs2svn to create tag 'ASInitial'.