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diff --git a/media/ffvpx/libavcodec/pthread_internal.h b/media/ffvpx/libavcodec/pthread_internal.h
new file mode 100644
index 0000000000..d0b6a7a673
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+++ b/media/ffvpx/libavcodec/pthread_internal.h
@@ -0,0 +1,66 @@
+/*
+ * 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 AVCODEC_PTHREAD_INTERNAL_H
+#define AVCODEC_PTHREAD_INTERNAL_H
+
+#include "avcodec.h"
+
+/* H.264 slice threading seems to be buggy with more than 16 threads,
+ * limit the number of threads to 16 for automatic detection */
+#define MAX_AUTO_THREADS 16
+
+int ff_slice_thread_init(AVCodecContext *avctx);
+void ff_slice_thread_free(AVCodecContext *avctx);
+
+int ff_frame_thread_init(AVCodecContext *avctx);
+void ff_frame_thread_free(AVCodecContext *avctx, int thread_count);
+
+#define THREAD_SENTINEL 0 // This forbids putting a mutex/condition variable at the front.
+/**
+ * Initialize/destroy a list of mutexes/conditions contained in a structure.
+ * The positions of these mutexes/conditions in the structure are given by
+ * their offsets. Because it is undefined behaviour to destroy
+ * an uninitialized mutex/condition, ff_pthread_init() stores the number
+ * of successfully initialized mutexes and conditions in the object itself
+ * and ff_pthread_free() uses this number to destroy exactly the mutexes and
+ * condition variables that have been successfully initialized.
+ *
+ * @param     obj     The object containing the mutexes/conditions.
+ * @param[in] offsets An array of offsets. Its first member gives the offset
+ *                    of the variable that contains the count of successfully
+ *                    initialized mutexes/condition variables; said variable
+ *                    must be an unsigned int. Two arrays of offsets, each
+ *                    delimited by a THREAD_SENTINEL follow. The first
+ *                    contains the offsets of all the mutexes, the second
+ *                    contains the offsets of all the condition variables.
+ */
+int  ff_pthread_init(void *obj, const unsigned offsets[]);
+void ff_pthread_free(void *obj, const unsigned offsets[]);
+
+/**
+ * Macros to help creating the above lists. mutexes and conds need
+ * to be parentheses-enclosed lists of offsets in the containing structure.
+ */
+#define OFFSET_ARRAY(...) __VA_ARGS__, THREAD_SENTINEL
+#define DEFINE_OFFSET_ARRAY(type, name, cnt_variable, mutexes, conds)         \
+static const unsigned name ## _offsets[] = { offsetof(type, cnt_variable),    \
+                                             OFFSET_ARRAY mutexes,            \
+                                             OFFSET_ARRAY conds }
+
+#endif // AVCODEC_PTHREAD_INTERNAL_H