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It avoids to draw to an invalid buffer. Withtout this the default frame buffer is undefined: glBindFramebuffer (GL_FRAMEBUFFER, 0) Visually you could see some white frames at the beginning when lunching videotestsrc ! glimagesink With OpenGL Profiler from XCode you could see some GL_INVALID_FRAMEBUFFER_OPERATION for the first frames |
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gst/gl |