Originally committed as revision 781 to svn://svn.ffmpeg.org/ffmpeg/trunk

* Some BeOS fixes:
- errno stuff
- nanosleep() replacement
- added a doc/README.beos

* mov reader still has problems with most videos (skips many chunks),
- It should now read .mov files with zlib-compressed moov headers (aka cmov)
- added SVQ1 support.
- removed mapping 'raw ' and 'yuv2' to h263, was my mistake.
- added IMA4 support. (tested)
- fixed frame rate (it reported 0 fps or something before)
- extended file probing ('wide' and 'free' atoms)
- improved .mov/.mp4 detection (or so I think)

* adpcm
* added zlib support, with header file and lib check

Originally committed as revision 780 to svn://svn.ffmpeg.org/ffmpeg/trunk

1. errno's are negative on beos, so negating them gives positive values.
2. the -shared flag is -nostart on beos.
3. building the shared lib on beos requires -fomit-frame-pointer
4. beos doesn't have oss support

Originally committed as revision 779 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 775 to svn://svn.ffmpeg.org/ffmpeg/trunk

printing some error messages if some error occurs

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Originally committed as revision 768 to svn://svn.ffmpeg.org/ffmpeg/trunk

returning buf_size insetad of 0

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Originally committed as revision 764 to svn://svn.ffmpeg.org/ffmpeg/trunk

 MpegEncContext->opaque MUST NOT be used by the codec, its for the parent program
 using standart values for pict_type
 using (uv)linesize
 handling dropable p-frames like b-frames

Originally committed as revision 763 to svn://svn.ffmpeg.org/ffmpeg/trunk

export has_b_frames
mb_skip with more than 2 ip buffers

Originally committed as revision 762 to svn://svn.ffmpeg.org/ffmpeg/trunk

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longer needed.

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Originally committed as revision 753 to svn://svn.ffmpeg.org/ffmpeg/trunk

* Mark MC pointer arguments as restrict

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Originally committed as revision 742 to svn://svn.ffmpeg.org/ffmpeg/trunk