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The components needing delayed frames (sc_screen and sc_v4l2_sink) managed a sc_video_buffer instance, which itself embedded a sc_frame_buffer instance (to keep only the most recent frame). In theory, these components should not be aware of delaying: they should just receive AVFrames later, and only handle a sc_frame_buffer. Therefore, refactor sc_delay_buffer as a frame source (it consumes) frames) and a frame sink (it produces frames, after some delay), and plug an instance in the pipeline only when a delay is requested. This also removes the need for a specific sc_video_buffer. PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>