update readme

README.md

@@ -3,9 +3,15 @@
 Shaders for Avidemux with OpenGL support
 
 ## gopro_8:7 - Fisheye removal for GoPro 11+, 8:7 ratio, 60fps, HyperSmooth off
+
+![Sample image](https://blog.rozk.net/wp-content/uploads/2025/07/compare.png)
+
 - unfish_gopro_8:7.glsl  
 Shader for fisheye removal
 
+- preset_gopro_8:7_4K_youtube.py  
+Preset for mp4, 4K, high bitrate
+
 - preset_gopro_8:7_4K_2160p.py  
 Preset for mp4, 4K, constant bitrate
 
@@ -22,12 +28,16 @@ Preset for mp4, QHD, constant bitrate
 Script to compute output FOV and frame widening
 
 ### Installation for BSD/GNU-Linux systems:
+
 - Copy the presets to ~/.avidemux6/custom/
 - Copy the shader to /opt/rk/avidemux/ (or edit the preset to set the path)  
 
 Or just run the script install_gopro_8:7.sh
-_For commercial OS's, figure out the paths yourself :)_
+
+_For commercial OS's, figure out the paths yourself, then edit the presets to fix the path to the .glsl file_
+
 ### Usage:
+
 - Load and edit video(s)
 - Select "Custom/preset_gopro_8:7_..." in the menu
 - Add filters