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diff --git a/app/src/main/jni/include/libavutil/display.h b/app/src/main/jni/include/libavutil/display.h
deleted file mode 100644
index c0cfee3..0000000
--- a/app/src/main/jni/include/libavutil/display.h
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * Copyright (c) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef AVUTIL_DISPLAY_H
-#define AVUTIL_DISPLAY_H
-
-#include <stdint.h>
-
-/**
- * The display transformation matrix specifies an affine transformation that
- * should be applied to video frames for correct presentation. It is compatible
- * with the matrices stored in the ISO/IEC 14496-12 container format.
- *
- * The data is a 3x3 matrix represented as a 9-element array:
- *
- *                                  | a b u |
- *   (a, b, u, c, d, v, x, y, w) -> | c d v |
- *                                  | x y w |
- *
- * All numbers are stored in native endianness, as 16.16 fixed-point values,
- * except for u, v and w, which are stored as 2.30 fixed-point values.
- *
- * The transformation maps a point (p, q) in the source (pre-transformation)
- * frame to the point (p', q') in the destination (post-transformation) frame as
- * follows:
- *               | a b u |
- *   (p, q, 1) . | c d v | = z * (p', q', 1)
- *               | x y w |
- *
- * The transformation can also be more explicitly written in components as
- * follows:
- *   p' = (a * p + c * q + x) / z;
- *   q' = (b * p + d * q + y) / z;
- *   z  =  u * p + v * q + w
- */
-
-/**
- * Extract the rotation component of the transformation matrix.
- *
- * @param matrix the transformation matrix
- * @return the angle (in degrees) by which the transformation rotates the frame
- *         counterclockwise. The angle will be in range [-180.0, 180.0],
- *         or NaN if the matrix is singular.
- *
- * @note floating point numbers are inherently inexact, so callers are
- *       recommended to round the return value to nearest integer before use.
- */
-double av_display_rotation_get(const int32_t matrix[9]);
-
-/**
- * Initialize a transformation matrix describing a pure counterclockwise
- * rotation by the specified angle (in degrees).
- *
- * @param matrix an allocated transformation matrix (will be fully overwritten
- *               by this function)
- * @param angle rotation angle in degrees.
- */
-void av_display_rotation_set(int32_t matrix[9], double angle);
-
-/**
- * Flip the input matrix horizontally and/or vertically.
- *
- * @param matrix an allocated transformation matrix
- * @param hflip whether the matrix should be flipped horizontally
- * @param vflip whether the matrix should be flipped vertically
- */
-void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip);
-
-#endif /* AVUTIL_DISPLAY_H */