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README_PIP_EN.MD

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FFmpeg Plus OpenGL(GLSL) - Picture in Picture Part

AVFilter: pipglshader

Effects show

filter shader name render
pipglshader Fragments Shader:
Plus-GL-Shader/gl_pip/pip_shader.gl
Vertex Shader:
Plus-GL-Shader/gl_pip/pip_vertex.gl

Usage

AVFilter Param

CMD - ffmpeg -h filter=pipglshader

pipglshader 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)
  start             <duration>   ..FV...... gl render start timestamp, if you set this option, must greater than zero(no trim) (default 0)
  duration          <duration>   ..FV...... gl render duration, if you set this option, must greater than zero(no trim) (default 0)
  pip_duration      <duration>   ..FV...... gl render pip picture's duration, if you set this option, must greater than zero(no trim) (default 0)
  ext_source        <string>     ..FV...... gl texture of pip 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
start Effects start time 5
duration background video's effect render duration 2
pip_duration pip(picuture in picture)'s video's effect render duration 2
ext_source pip video's path ./video2.mp4

CMD - Example

ffmpeg -v debug \
    -ss 0 -t 3 \
    -i bg.mp4 \
    -filter_complex \
    "[0:v]scale=2560:1600,setsar=sar=1/1,setdar=dar=2560/1600[scale0];
    [scale0]pipglshader=start=0:duration=3:pip_duration=3:ext_source=video2.mp4:vxsource=gl_pip/pip_vertex.gl:sdsource=gl_pip/pip_shader.gl" \
    -vcodec libx264 \
    -an \
    -pix_fmt yuv420p \
    -y output.mp4

Shader Uniform

All of uniform

uniform float playTime;
uniform float startTime;
uniform float scale_w;
uniform float scale_h;
uniform float isPIP;
uniform float mainDuration;
uniform float pipDuration;
uniform float mainWidth;
uniform float mainHeight;
uniform float pipWidth;
uniform float pipHeight;

uniform value description

Param Desc Example
playTime play timestamp 1.1(second)
startTime Effect start time 5.0
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
isPIP render is second video 0.0/1.0 = Y/N
mainDuration background video's effect duration 2.0
pipDuration pip video's effect duration 2.0
mainWidth first video's width 1280
mainHeight first video's height 720
pipWidth second video's width 1280
pipHeight second video's height 720