Why you should force fixed & closed GOPs (and how to do it in ffmpeg)

Today I’m going cover why you would want to use fixed & closed GOPs in HLS streaming – and how to do it using ffmpeg. Open and closed groups of pictures If you came here you probably already know that in video coding a group of pictures (GOP) is a term that defines how I, P and B frames are arranged – or more specifically, the interval between the I-frames. I frames contain full image data, while P and B frames are so-called predictive frames and only have partial data.
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