使用ffmepg实现多路视频流合并

--------------------------- GLEW Extension Info --------------------------- GLEW version 2.2.0 Reporting capabilities of pixelformat 3 Running on a Intel(R) HD Graphics 530 from Intel OpenGL version 4.4.0 - Build 21.20.16.5064 is supported GL_VERSION_1_1: OK --------------- GL_VERSION_1_2: OK --------------- glCopyTexSubImage3D: OK glDrawRangeElements: OK glTexImage3D: OK glTexSubImage3D: OK GL_VERSION_1_2_1: OK ----------------- GL_VERSION_1_3: OK --------------- glActiveTexture: OK glClientActiveTexture: OK glCompressedTexImage1D: OK glCompressedTexImage2D: OK glCompressedTexImage3D: OK glCompressedTexSubImage1D: OK glCompressedTexSubImage2D: OK glCompressedTexSubImage3D: OK glGetCompressedTexImage: OK glLoadTransposeMatrixd: OK glLoadTransposeMatrixf: OK glMultTransposeMatrixd: OK glMultTransposeMatrixf: OK glMultiTexCoord1d: OK glMultiTexCoord1dv: OK glMultiTexCoord1f: OK glMultiTexCoord1fv: OK glMultiTexCoord1i: OK glMultiTexCoord1iv: OK glMultiTexCoord1s: OK glMultiTexCoord1sv: OK glMultiTexCoord2d: OK glMultiTexCoord2dv: OK glMultiTexCoord2f: OK glMultiTexCoord2fv: OK glMultiTexCoord2i: OK glMultiTexCoord2iv: OK glMultiTexCoord2s: OK glMultiTexCoord2sv: OK glMultiTexCoord3d: OK glMultiTexCoord3dv: OK glMultiTexCoord3f: OK glMultiTexCoord3fv: OK glMultiTexCoord3i: OK glMultiTexCoord3iv: OK glMultiTexCoord3s: OK glMultiTexCoord3sv: OK glMultiTexCoord4d: OK glMultiTexCoord4dv: OK glMultiTexCoord4f: OK glMultiTexCoord4fv: OK glMultiTexCoord4i: OK glMultiTexCoord4iv: OK glMultiTexCoord4s: OK glMultiTexCoord4sv: OK glSampleCoverage: OK GL_VERSION_1_4: OK --------------- glBlendColor: OK glBlendEquation: OK glBlendFuncSeparate: OK glFogCoordPointer: OK glFogCoordd: OK glFogCoorddv: OK glFogCoordf: OK glFogCoordfv: OK glMultiDrawArrays: OK glMultiDrawElements: OK glPointParameterf: OK glPointParameterfv: OK glPointParameteri: OK glPointParameteriv: OK glSecondaryColor3b: OK glSecondaryColor3bv: OK glSecondaryColor3d: OK glSecondaryColor3dv: OK glSecondaryColor3f: OK glSecondaryColor3fv: OK glSecondaryColor3i: OK glSecondaryColor3iv: OK glSecondaryColor3s: OK glSecondaryColor3sv: OK glSecondaryColor3ub: OK glSecondaryColor3ubv: OK glSecondaryColor3ui: OK glSecondaryColor3uiv: OK glSecondaryColor3us: OK glSecondaryColor3usv: OK glSecondaryColorPointer: OK glWindowPos2d: OK glWindowPos2dv: OK glWindowPos2f: OK glWindowPos2fv: OK glWindowPos2i: OK glWindowPos2iv: OK glWindowPos2s: OK glWindowPos2sv: OK glWindowPos3d: OK glWindowPos3dv: OK glWindowPos3f: OK glWindowPos3fv: OK glWindowPos3i: OK glWindowPos3iv: OK glWindowPos3s: OK glWindowPos3sv: OK GL_VERSION_1_5: OK --------------- glBeginQuery: OK glBindBuffer: OK glBufferData: OK glBufferSubData: OK glDeleteBuffers: OK glDeleteQueries: OK glEndQuery: OK glGenBuffers: OK glGenQueries: OK glGetBufferParameteriv: OK glGetBufferPointerv: