diff --git a/libavfilter/tinterlace.h b/libavfilter/tinterlace.h
new file mode 100644
index 0000000000..8fc95cbc92
--- /dev/null
+++ b/libavfilter/tinterlace.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2011 Stefano Sabatini
+ * Copyright (c) 2010 Baptiste Coudurier
+ * Copyright (c) 2003 Michael Zucchi <notzed@ximian.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 General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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.
+ */
+
+/**
+ * @file
+ * temporal field interlace filter, ported from MPlayer/libmpcodecs
+ */
+#ifndef AVFILTER_TINTERLACE_H
+#define AVFILTER_TINTERLACE_H
+
+#include "libavutil/opt.h"
+#include "avfilter.h"
+
+enum TInterlaceMode {
+    MODE_MERGE = 0,
+    MODE_DROP_EVEN,
+    MODE_DROP_ODD,
+    MODE_PAD,
+    MODE_INTERLEAVE_TOP,
+    MODE_INTERLEAVE_BOTTOM,
+    MODE_INTERLACEX2,
+    MODE_NB,
+};
+
+typedef struct {
+    const AVClass *class;
+    enum TInterlaceMode mode;   ///< interlace mode selected
+    int flags;                  ///< flags affecting interlacing algorithm
+    int frame;                  ///< number of the output frame
+    int vsub;                   ///< chroma vertical subsampling
+    AVFrame *cur;
+    AVFrame *next;
+    uint8_t *black_data[4];     ///< buffer used to fill padded lines
+    int black_linesize[4];
+} TInterlaceContext;
+
+#endif /* AVFILTER_TINTERLACE_H */
diff --git a/libavfilter/vf_tinterlace.c b/libavfilter/vf_tinterlace.c
index a3cb52d361..6ef2a92c88 100644
--- a/libavfilter/vf_tinterlace.c
+++ b/libavfilter/vf_tinterlace.c
@@ -30,29 +30,7 @@
 #include "libavutil/avassert.h"
 #include "avfilter.h"
 #include "internal.h"
-
-enum TInterlaceMode {
-    MODE_MERGE = 0,
-    MODE_DROP_EVEN,
-    MODE_DROP_ODD,
-    MODE_PAD,
-    MODE_INTERLEAVE_TOP,
-    MODE_INTERLEAVE_BOTTOM,
-    MODE_INTERLACEX2,
-    MODE_NB,
-};
-
-typedef struct {
-    const AVClass *class;
-    enum TInterlaceMode mode;   ///< interlace mode selected
-    int flags;                  ///< flags affecting interlacing algorithm
-    int frame;                  ///< number of the output frame
-    int vsub;                   ///< chroma vertical subsampling
-    AVFrame *cur;
-    AVFrame *next;
-    uint8_t *black_data[4];     ///< buffer used to fill padded lines
-    int black_linesize[4];
-} TInterlaceContext;
+#include "tinterlace.h"
 
 #define OFFSET(x) offsetof(TInterlaceContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM