FF_GL_RED_COMPONENT   75 libavdevice/opengl_enc.c #define FF_GL_RED_COMPONENT GL_RED
FF_GL_RED_COMPONENT   77 libavdevice/opengl_enc.c #define FF_GL_RED_COMPONENT GL_LUMINANCE
FF_GL_RED_COMPONENT   79 libavdevice/opengl_enc.c #define FF_GL_RED_COMPONENT 0x1903; //GL_RED