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README_FADE_EN.MD

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FFmpeg Plus OpenGL(GLSL) - Transition Fade Part

AVFilter: fadeglshader

Effects show

filter shader name render
fadeglshader Fragments Shader:
Plus-GL-Shader/gl_fade/fade_shader.gl
Vertex Shader:
Plus-GL-Shader/gl_fade/fade_vertex.gl

Usage

AVFilter Param

CMD - ffmpeg -h filter=fadeglshader

fadeglshader AVOptions:
  sdsource          <string>     ..FV...... gl fragment shader source path (default is render lut fragment)
  vxsource          <string>     ..FV...... gl vertex shader source path (default is render lut vertex)
  offset            <duration>   ..FV...... gl render start timestamp, if you set this option, must greater than zero(no trim) (default 0)
  fade_duration     <duration>   ..FV...... gl render fade picture's duration, if you set this option, must greater than zero(no trim) (default 0)
  ext_source        <string>     ..FV...... gl texture of second source media file (default is null)

Param description

Param Desc Example
vxsource Vertex shader file path Plus-GL-Shader/gl_fade/fade_vertex.gl
sdsource Fragment shader file path Plus-GL-Shader/gl_fade/fade_shader.gl
offset Transtion start time 5
fade_duration Transition duration 2
ext_source Second video path in transtion ./video2.mp4

CMD - Example

ffmpeg -v debug \
    -ss 0 -t 5 \
    -i first.mp4 \
    -filter_complex \
    "[0:v]scale=2560:1600[scale0];
    [scale0]fadeglshader=offset=4:fade_duration=1:ext_source=second.mp4:vxsource=gl_fade/fade_vertex.gl:sdsource=gl_fade/fade_shader.gl[effects];
    [effects]scale=1000:1000" \
    -vcodec libx264 \
    -an \
    -pix_fmt yuv420p \
    -y output.mp4

Shader Uniform

All of uniform

uniform float progress;
uniform float playTime;
uniform float scale_w;
uniform float scale_h;
uniform float isSecond;
uniform float fadeDuration;
uniform float offset;
uniform float mainWidth;
uniform float mainHeight;
uniform float secondWidth;
uniform float secondHeight;

uniform value description

Param Desc Example
progress Most import:progress of transition(percent) 0-1.0 0.5
playTime play timestamp 1.1(second)
scale_w the second video's adapte scale width(maybe dont need) 1.0
scale_h the second video's adapte scale height(maybe dont need) 1.0
isSecond render is second video 0.0/1.0 = Y/N
offset Transition start time 5.0
fadeDuration Transition duration 2.0
mainWidth first video's width 1280
mainHeight first video's height 720
secondWidth second video's width 1280
secondHeight second video's height 720