Merged from ffmbc0.3

Originally committed as revision 20861 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20860 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20859 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by klchxbec AT freenet DOT de.

Originally committed as revision 20858 to svn://svn.ffmpeg.org/ffmpeg/trunk

between V4L2 formats and ffmpeg's formats/codecs.
Patch by klchxbec AT freenet DOT de.

Originally committed as revision 20857 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20856 to svn://svn.ffmpeg.org/ffmpeg/trunk

mmap_read_frame() takes care of ensuring that the packet size
is correct.

Originally committed as revision 20855 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20854 to svn://svn.ffmpeg.org/ffmpeg/trunk

Fixes issue #1569

Originally committed as revision 20853 to svn://svn.ffmpeg.org/ffmpeg/trunk

change from ffmbc

Originally committed as revision 20852 to svn://svn.ffmpeg.org/ffmpeg/trunk

Also more consistent with the rest of the code.

Originally committed as revision 20851 to svn://svn.ffmpeg.org/ffmpeg/trunk

be displayed. (idea from ffmbc)

Originally committed as revision 20850 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20849 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20848 to svn://svn.ffmpeg.org/ffmpeg/trunk

This looks too ugly. Idea also from ffmbc.

Originally committed as revision 20847 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20846 to svn://svn.ffmpeg.org/ffmpeg/trunk

Idea from ffmbc, code not, mine is a fraction of the size due to simpler
metadata API.

Originally committed as revision 20845 to svn://svn.ffmpeg.org/ffmpeg/trunk

Note if this breaks for some file, report it please!

Originally committed as revision 20844 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20843 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20842 to svn://svn.ffmpeg.org/ffmpeg/trunk

Merged from ffmbc.

Originally committed as revision 20841 to svn://svn.ffmpeg.org/ffmpeg/trunk

somewhat based on ffmbc

Originally committed as revision 20840 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20839 to svn://svn.ffmpeg.org/ffmpeg/trunk

from ffmbc

Originally committed as revision 20838 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20837 to svn://svn.ffmpeg.org/ffmpeg/trunk

arrays of fixed length.
Code from ffmbc with changes to adapt to our metadata API.

Originally committed as revision 20836 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20835 to svn://svn.ffmpeg.org/ffmpeg/trunk

I cannot use the same ABI as ffmbc as value 2 is already used in ffmpeg,
besides the name AV_METADATA_NONCONST* makes no sense to me.
Add av_metadata_set2() that takes flags.

Originally committed as revision 20834 to svn://svn.ffmpeg.org/ffmpeg/trunk

Without this random changes to the header inclusion can trigger
linking failures, and these are not even picked up in some environments
(some fate machines didnt catch it).

Originally committed as revision 20833 to svn://svn.ffmpeg.org/ffmpeg/trunk

This as a sideeffect fixes the linking failure of ffplay.

Originally committed as revision 20832 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20831 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20830 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20829 to svn://svn.ffmpeg.org/ffmpeg/trunk

might be usefull for others ...

Originally committed as revision 20828 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20827 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20826 to svn://svn.ffmpeg.org/ffmpeg/trunk

multi-channel correlation mode.

Originally committed as revision 20825 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20824 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20823 to svn://svn.ffmpeg.org/ffmpeg/trunk

This safes the users time to find out which of -h --help -? works.

Originally committed as revision 20822 to svn://svn.ffmpeg.org/ffmpeg/trunk