VIXY FLV Converter contains the code that based on FFmpeg. 
The following is the code and copyright notice.


/ffmpeg/libavcodec/bitstream.h

/ffmpeg/libavcodec/bitstream.c
 * Copyright (c) 2000, 2001 Fabrice Bellard.
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

/ffmpeg/libavcodec/h263.c
 * Copyright (c) 2001 Juan J. Sierralta P.
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

/ffmpeg/libavcodec/h263data.h

/ffmpeg/libavcodec/h263dec.c
 * Copyright (c) 2001 Fabrice Bellard.
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

/ffmpeg/libavcodec/mpeg4data.h

/ffmpeg/libavcodec/mpegvideo.c
 * Copyright (c) 2000,2001 Fabrice Bellard.
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 
/ffmpeg/libavcodec/mpegvideo.h
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
 * Copyright (c) 2002-2004 Michael Niedermayer
 
And see /FFMPEG_CREDITS.
Thanks.