diff --git a/src/add-ons/media/plugins/matroska/matroska_reader.cpp b/src/add-ons/media/plugins/matroska/matroska_reader.cpp
index d0b661bcbb..e468360d46 100644
--- a/src/add-ons/media/plugins/matroska/matroska_reader.cpp
+++ b/src/add-ons/media/plugins/matroska/matroska_reader.cpp
@@ -235,6 +235,14 @@ mkvReader::SetupVideoCookie(mkv_cookie *cookie)
 		TRACE("mkvReader::SetupVideoCookie: codec not recognized\n");
 		return B_ERROR;
 	}
+	
+	uint16 width_aspect_ratio;
+	uint16 height_aspect_ratio;
+	get_pixel_aspect_ratio(&width_aspect_ratio, &height_aspect_ratio,
+						   cookie->track_info->Video.PixelWidth,
+						   cookie->track_info->Video.PixelHeight,
+						   cookie->track_info->Video.DisplayWidth,
+						   cookie->track_info->Video.DisplayHeight);
 
 //	cookie->format.u.encoded_video.max_bit_rate = 
 //	cookie->format.u.encoded_video.avg_bit_rate = 
@@ -243,8 +251,8 @@ mkvReader::SetupVideoCookie(mkv_cookie *cookie)
 	cookie->format.u.encoded_video.output.first_active = 0;
 	cookie->format.u.encoded_video.output.last_active = cookie->line_count - 1;
 	cookie->format.u.encoded_video.output.orientation = B_VIDEO_TOP_LEFT_RIGHT;
-	cookie->format.u.encoded_video.output.pixel_width_aspect = get_pixel_width_aspect(cookie->track_info->Video.PixelWidth, cookie->track_info->Video.DisplayWidth);
-	cookie->format.u.encoded_video.output.pixel_height_aspect = get_pixel_height_aspect(cookie->track_info->Video.PixelHeight, cookie->track_info->Video.DisplayHeight);
+	cookie->format.u.encoded_video.output.pixel_width_aspect = width_aspect_ratio;
+	cookie->format.u.encoded_video.output.pixel_height_aspect = height_aspect_ratio;
 	// cookie->format.u.encoded_video.output.display.format = 0;
 	cookie->format.u.encoded_video.output.display.line_width = cookie->track_info->Video.PixelWidth;
 	cookie->format.u.encoded_video.output.display.line_count = cookie->track_info->Video.PixelHeight;
diff --git a/src/add-ons/media/plugins/matroska/matroska_util.cpp b/src/add-ons/media/plugins/matroska/matroska_util.cpp
index 1eb23759ed..4fe2ff4779 100644
--- a/src/add-ons/media/plugins/matroska/matroska_util.cpp
+++ b/src/add-ons/media/plugins/matroska/matroska_util.cpp
@@ -23,6 +23,7 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include <string.h>
+#include <stdio.h>
 #include "matroska_util.h"
 
 
@@ -64,16 +65,29 @@ get_frame_count_by_default_duration(uint64 duration, uint64 default_duration)
 }
 
 
-uint16
-get_pixel_width_aspect(unsigned int pixel_width, unsigned int display_width)
+void
+get_pixel_aspect_ratio(uint16 *width_aspect_ratio, uint16 *height_aspect_ratio,
+					   unsigned int pixel_width, unsigned int pixel_height,
+					   unsigned int display_width,  unsigned int display_height)
 {
-	return 1;
+	printf("get_pixel_aspect_ratio: pixel_width %u, pixel_height %u, display_width %u, display_height %u\n",
+			pixel_width, pixel_height, display_width, display_height);
+			
+	if (pixel_width == display_width && pixel_height == display_height) {
+		*width_aspect_ratio = 1;
+		*height_aspect_ratio = 1;
+		return;
+	}
+	
+	double w_aspect = display_width / (double)pixel_width;
+	double h_aspect = display_height / (double)pixel_height;
+	w_aspect /= h_aspect;
+	h_aspect = 1;
+	
+	printf("w_aspect %.6f, h_aspect %.6f\n", w_aspect, h_aspect);
+
+	*width_aspect_ratio = uint16(w_aspect * 10000 + 0.5);
+	*height_aspect_ratio = 10000;
+
+	printf("w_aspect %.6f, h_aspect %.6f, ratio %u:%u\n", w_aspect, h_aspect, *width_aspect_ratio, *height_aspect_ratio);
 }
-
-
-uint16
-get_pixel_height_aspect(unsigned int pixel_height, unsigned int display_height)
-{
-	return 1;
-}
-
diff --git a/src/add-ons/media/plugins/matroska/matroska_util.h b/src/add-ons/media/plugins/matroska/matroska_util.h
index a929827125..0481edbf6c 100644
--- a/src/add-ons/media/plugins/matroska/matroska_util.h
+++ b/src/add-ons/media/plugins/matroska/matroska_util.h
@@ -32,8 +32,9 @@ float		get_frame_rate(uint64 default_duration);
 uint64		get_frame_count_by_frame_rate(uint64 duration, float frame_rate);
 uint64		get_frame_count_by_default_duration(uint64 duration, uint64 default_duration);
 
-uint16		get_pixel_width_aspect(unsigned int pixel_width, unsigned int display_width);
-uint16		get_pixel_height_aspect(unsigned int pixel_height, unsigned int display_height);
+void		get_pixel_aspect_ratio(uint16 *width_aspect_ratio, uint16 *height_aspect_ratio,
+								   unsigned int pixel_width, unsigned int pixel_height,
+								   unsigned int display_width,  unsigned int display_height);
 
 #endif