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diff --git a/src/lib/ffmpeg/rational.pas b/src/lib/ffmpeg/rational.pas
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+(*
+ * Rational numbers
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *)
+ 
+(*
+ * This is a part of Pascal porting of ffmpeg.
+ * - Originally by Victor Zinetz for Delphi and Free Pascal on Windows.
+ * - For Mac OS X, some modifications were made by The Creative CAT, denoted as CAT
+ *   in the source codes.
+ * - Changes and updates by the UltraStar Deluxe Team
+ *)
+
+(*
+ * Conversion of libavutil/rational.h
+ * revision 12498, Wed Mar 19 06:17:43 2008 UTC
+ *)
+
+unit rational;
+
+{$IFDEF FPC}
+  {$MODE DELPHI}
+  {$PACKENUM 4}    (* use 4-byte enums *)
+  {$PACKRECORDS C} (* C/C++-compatible record packing *)
+{$ELSE}
+  {$MINENUMSIZE 4} (* use 4-byte enums *)
+{$ENDIF}
+
+{$I switches.inc}
+
+interface
+
+uses
+  ctypes,
+  UConfig;
+
+type
+(*
+ * Rational number num/den.
+ *)
+  PAVRational = ^TAVRational;
+  TAVRational = record
+    num: cint; ///< numerator
+    den: cint; ///< denominator
+  end;
+
+(**
+ * Compare two rationals.
+ * @param a first rational
+ * @param b second rational
+ * @return 0 if a==b, 1 if a>b and -1 if a<b.
+ *)
+function av_cmp_q(a: TAVRational; b: TAVRational): cint; {$IFDEF HasInline}inline;{$ENDIF}
+
+(**
+ * Rational to double conversion.
+ * @param a rational to convert
+ * @return (double) a
+ *)
+function av_q2d(a: TAVRational): cdouble; {$IFDEF HasInline}inline;{$ENDIF}
+
+(**
+ * Reduce a fraction.
+ * This is useful for framerate calculations.
+ * @param dst_nom destination numerator
+ * @param dst_den destination denominator
+ * @param nom source numerator
+ * @param den source denominator
+ * @param max the maximum allowed for dst_nom & dst_den
+ * @return 1 if exact, 0 otherwise
+ *)
+function av_reduce(dst_nom: PCint; dst_den: PCint; nom: cint64; den: cint64; max: cint64): cint;
+  cdecl; external av__util;
+
+(**
+ * Multiplies two rationals.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b*c.
+ *)
+function av_mul_q(b: TAVRational; c: TAVRational): TAVRational;
+  cdecl; external av__util; {av_const}
+
+(**
+ * Divides one rational by another.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b/c.
+ *)
+function av_div_q(b: TAVRational; c: TAVRational): TAVRational;
+  cdecl; external av__util; {av_const}
+
+(**
+ * Adds two rationals.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b+c.
+ *)
+function av_add_q(b: TAVRational; c: TAVRational): TAVRational;
+  cdecl; external av__util; {av_const}
+
+(**
+ * Subtracts one rational from another.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b-c.
+ *)
+function av_sub_q(b: TAVRational; c: TAVRational): TAVRational;
+  cdecl; external av__util; {av_const}
+
+(**
+ * Converts a double precision floating point number to a rational.
+ * @param d double to convert
+ * @param max the maximum allowed numerator and denominator
+ * @return (AVRational) d.
+ *)
+function av_d2q(d: cdouble; max: cint): TAVRational;
+  cdecl; external av__util; {av_const}
+
+implementation
+
+function av_cmp_q (a: TAVRational; b: TAVRational): cint;
+var
+  tmp: cint64;
+begin
+  tmp := a.num * cint64(b.den) - b.num * cint64(a.den);
+
+  if (tmp <> 0) then
+    Result := (tmp shr 63) or 1
+  else
+    Result := 0
+end;
+
+function av_q2d(a: TAVRational): cdouble;
+begin
+  Result := a.num / a.den;
+end;
+
+end.