diff --git a/gopro_8:7/preset_gopro_8:7.py b/gopro_8:7/preset_gopro_8:7.py
index f105ae2..e737154 100644
--- a/gopro_8:7/preset_gopro_8:7.py
+++ b/gopro_8:7/preset_gopro_8:7.py
@@ -88,12 +88,26 @@ adm.videoCodec(
 adm.addVideoFilter(
     "shaderLoader", "shaderFile=/opt/rk/avidemux/unfish_gopro_8:7.glsl")
 adm.addVideoFilter(
-    "swscale", "width=2792", "height=2160", "algo=2", "sourceAR=0", "targetAR=0", "lockAR=False", "roundup=0")
+    "crop",
+    "top=80",
+    "bottom=0",
+    "left=0",
+    "right=0",
+    "ar_select=0")
+adm.addVideoFilter(
+    "swscale",
+    "width=2880",
+    "height=2160",
+    "algo=2",
+    "sourceAR=0",
+    "targetAR=0",
+    "lockAR=False",
+    "roundup=0")
 adm.audioClearTracks()
 if adm.audioTotalTracksCount() <= 0:
     raise("Cannot add audio track 0, total tracks: " + str(adm.audioTotalTracksCount()))
 adm.audioAddTrack(0)
-adm.audioCodec(0, "LavAAC", "bitrate=128")
+adm.audioCodec(0, "LavAAC", "bitrate=192")
 adm.audioSetDrc2(0, 1, 1, 0.001, 0.2, 1, 2, -12)
 adm.audioSetEq(0, 0, 0, 0, 0, 880, 5000)
 adm.audioSetChannelGains(0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
diff --git a/gopro_8:7/unfish_gopro_8:7.glsl b/gopro_8:7/unfish_gopro_8:7.glsl
index 951be4b..a5ae2b8 100644
--- a/gopro_8:7/unfish_gopro_8:7.glsl
+++ b/gopro_8:7/unfish_gopro_8:7.glsl
@@ -35,6 +35,7 @@ uniform float pts;
 const vec2 sensor_size = vec2(5.949440, 5.205760);
 const float equidistant_focal_length = 2.970000;
 const float rectilinear_focal_length = 2.167601;
+const vec2 rectilinear_scale = vec2(1.138819, 1.0);
 
 // constants
 const int subsampling = 4;
@@ -49,7 +50,7 @@ vec2 sensor_to_texture;
 
 void initialize() {
     texture_center = myResolution * 0.5;
-    texture_to_sensor = sensor_size / myResolution;
+    texture_to_sensor = (sensor_size / myResolution) * rectilinear_scale;
 #ifdef rotate_180
     texture_to_sensor *= -1.0;
 #endif
@@ -68,7 +69,7 @@ vec3 sample_texture(const in vec2 coord) {
     vec2 y_coord = texture_center + rectilinear * sensor_to_texture;
 #ifdef debug_borders
     if (y_coord.x < 0.0 || y_coord.y < 0.0 || y_coord.x > myResolution.x || y_coord.y > myResolution.y) {
-        return vec3(16.0 / 255.0, 0.5, 0.5);
+        return vec3(235.0 / 255.0, 240.0 / 255.0, 240.0 / 255.0);
     }
 #endif
     vec2 uv_coord = y_coord * 0.5;
diff --git a/gopro_8:7/unfish_gopro_8:7.py b/gopro_8:7/unfish_gopro_8:7.py
index db39b4e..fb848e4 100644
--- a/gopro_8:7/unfish_gopro_8:7.py
+++ b/gopro_8:7/unfish_gopro_8:7.py
@@ -27,6 +27,9 @@ sensor_pixel_size = 1.12 * 0.001 # mm
 gopro_array_horizontal = 5312 # p
 gopro_array_vertical   = 4648 # p
 
+gopro_texture_horizontal = 3840 # p
+gopro_texture_vertical   = 3360 # p
+
 gopro_size_horizontal = gopro_array_horizontal * sensor_pixel_size
 gopro_size_vertical   = gopro_array_vertical   * sensor_pixel_size
 gopro_size_diagonal   = math.hypot(gopro_size_horizontal, gopro_size_vertical)
@@ -70,12 +73,12 @@ print("linear focal: horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (mm)
     rectilinear_focal_length_vertical,
     rectilinear_focal_length_diagonal))
 
-rectilinear_radius = lambda angle,  focal_length: focal_length * math.tan(math.radians(angle))
-rectilinear_angle  = lambda radius, focal_length: math.degrees(math.atan(radius / focal_length))
+rectilinear_radius = lambda angle:  rectilinear_focal_length_vertical * math.tan(math.radians(angle))
+rectilinear_angle  = lambda radius: math.degrees(math.atan(radius / rectilinear_focal_length_vertical))
 
-rectilinear_fov_horizontal = 2.0 * rectilinear_angle(gopro_radius_horizontal, rectilinear_focal_length_vertical)
-rectilinear_fov_vertical   = 2.0 * rectilinear_angle(gopro_radius_vertical,   rectilinear_focal_length_vertical)
-rectilinear_fov_diagonal   = 2.0 * rectilinear_angle(gopro_radius_diagonal,   rectilinear_focal_length_vertical)
+rectilinear_fov_horizontal = 2.0 * rectilinear_angle(gopro_radius_horizontal)
+rectilinear_fov_vertical   = 2.0 * rectilinear_angle(gopro_radius_vertical)
+rectilinear_fov_diagonal   = 2.0 * rectilinear_angle(gopro_radius_diagonal)
 
 print("linear fov  : horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (deg)" % (
     rectilinear_fov_horizontal,
@@ -84,23 +87,41 @@ print("linear fov  : horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (deg
 
 print("\n--- shader parameters ---\n")
 
+output_size_horizontal = 2.0 * rectilinear_radius(gopro_fov_horizontal * 0.5)
+output_size_vertical   = gopro_size_vertical
+
+output_scale_horizontal = output_size_horizontal / gopro_size_horizontal
+
 print("""// parameters
 const vec2 sensor_size = vec2(%.6f, %.6f);
 const float equidistant_focal_length = %.6f;
-const float rectilinear_focal_length = %.6f;""" % (
+const float rectilinear_focal_length = %.6f;
+const vec2 rectilinear_scale = vec2(%.6F, 1.0);""" % (
     gopro_size_horizontal, gopro_size_vertical,
     gopro_focal_length,
-    rectilinear_focal_length_vertical)
+    rectilinear_focal_length_vertical,
+    output_scale_horizontal)
 )
 
-# print("\n--- filter parameters 4K ---\n")
-#
-# width_scale = rectilinear_focal_length_vertical / rectilinear_focal_length_horizontal
-#
-# output_height = 2160
-# output_width  = int(round((output_height / gopro_array_vertical) * gopro_array_horizontal * width_scale))
-#
-# print("resize: width = %d, height = %d, ratio = %f" % (
-#     output_width,
-#     output_height,
-#     output_width / output_height))
+print("\n--- filters parameters ---\n")
+
+output_ratio_horizontal = 4.0
+output_ratio_vertical   = 3.0
+
+output_crop_ratio      = output_ratio_vertical / (output_ratio_horizontal / output_scale_horizontal)
+
+output_crop_horizontal = gopro_texture_horizontal
+output_crop_vertical   = output_crop_horizontal * output_crop_ratio
+
+print("crop  : width = %d, height = %d" % (
+    output_crop_horizontal,
+    round(output_crop_vertical)))
+
+def print_output_array(array_vertical):
+    array_horizontal = (array_vertical / output_ratio_vertical) * output_ratio_horizontal
+    print("resize: width = %d, height = %d" % (
+        round(array_horizontal / 4.0) * 4,
+        array_vertical))
+
+print_output_array(2160)
+print_output_array(1080)