Avidemux Shaders

Shaders for Avidemux with OpenGL support

GoPro fisheye removal v2.0

gopro_8:7 - Fisheye removal for GoPro 11+, 8:7 ratio, 4K, HyperSmooth off

What's new

• New method based on sensor size and focal length
• Accurate frame widening
• Fisheye aware subsampling
• Rec.709 colorspace conversion

Content

• avidemux.patch
  Optional patch to use GL_NEAREST instead of GL_LINEAR for the luminance channel (the shader is implementing bilinear interpolation with colorspace conversion).

• unfish_gopro_8:7.py
  Script to compute the parameters

• unfish_gopro_8:7.glsl
  Shader for fisheye removal

• preset_gopro_8:7.py
  Preset for mp4, 4K, high quality compression

Installation for BSD/GNU-Linux systems:

• Copy the preset into ~/.avidemux6/custom or ~/.local/share/avidemux6/custom
• Copy the shader into /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, then edit the preset to fix the path to the .glsl file

Usage:

• Load and edit video(s)
• Select "Custom/preset_gopro_8:7" in the menu
• Modify and/or add filters
• Save the video

Shader options

• #define color_conversion: comment out to disable gamma correction for the luminance channel
• #define texture_filtering: comment out to disable custom bilinear filtering for the luminance channel
• #define rotate_180: uncomment to rotate the image by 180 degrees