Main reason is: deltas in interframes need scaling by 3/4 before applying.
Detailed description is at:
http://sourceforge.net/tracker/index.php?func=detail&aid=1222099&group_id=16082&atid=116082
He also mentioned some samples at:
http://www.nerdgrounds.com/indeo21_test/
patch posted to ffmpeg-devel by (Kostya: kostya shishkov, gmail com)


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fixing output_example to work with current CVS libavcodec/libavformat patch by ("Andreas U. Trottmann": andreas trottmann, werft22 com)


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avoid adding duplicate global headers to the bitstream


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part of the 'libavformat/utils.c doxygen documentation' patch by (Daniel Kristjansson: danielk, cat nyu edu)


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dont open and close codec at every call of try_decode_frame() as this is not only slow but also fails if the previous frame is needed for setting some parameters correctly


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a timebase isnt an average frame rate neither can highlevel (considering edit lists) duration be mixed with lowlevel ones


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a little bit more standard, although it still seems to lack some
metadata. Anyway, recent mplayer plays these streams without problems.

It also has two globally scoped global structs changed to "static".
patch by (Erik Slagter <erik slagter name)


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