and fix GPL/LGPL version mismatches.

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fix index less seeking

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reading even beyond it.
Therefore if the ASF file includes an index object at its end, the
reader will treat the index like data, but of course will fail since
it thinks that the data is corrupted.
When reading an asf file with an index object, ffmpeg will
complain at the end of the file that it read an invalid header.
Patch by Kohn Emil Dan, < emild A cs P technion P ac P il >
Original thead:
Date: Apr 18, 2006 4:11 PM
Subject: [Ffmpeg-devel] Two ASF related bugs and fixes

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http://avifile.sourceforge.net/asf-1.0.htm has more info about asf headers
Original thread:
Date: Oct 22, 2005 11:44 PM
Subject: [Ffmpeg-devel] [PATCH] Fix asf header decoding issue

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in libavformat to allow building (de)coders and (de)muxers independently at
some point + support for this option in configure.

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Originally committed as revision 3860 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3822 to svn://svn.ffmpeg.org/ffmpeg/trunk

pts should start at start_time

Originally committed as revision 3771 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3767 to svn://svn.ffmpeg.org/ffmpeg/trunk

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direction flag for seeking

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Originally committed as revision 3239 to svn://svn.ffmpeg.org/ffmpeg/trunk

set correct timebase for nut
merge mpeg-ts seeking with existing seeking code
10l fix in mpegts (27mhz vs. 90khz)

Originally committed as revision 3152 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3148 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3003 to svn://svn.ffmpeg.org/ffmpeg/trunk

1. Corrected packet sent time. (Packet sent time => previous packet sent
     time)
  2. Corrected payload playing time. (Payload playing time => packet sent
     time)
  3. Used different format for packets with one payload and multi payloads.

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Originally committed as revision 2850 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2840 to svn://svn.ffmpeg.org/ffmpeg/trunk

adaptively change middle position selection algo for seeking, this avoids some ugly worstcases of the interpolated variant
  avoid backward search for mpeg where possible, its 17 times slower then forward according to my benchmark

Originally committed as revision 2710 to svn://svn.ffmpeg.org/ffmpeg/trunk

asf seek fixes & use keyframe pos/timestamp cache

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