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I use AVAssetWriter to record a video for 240FPS to make slow motion, but the frame rate ruduced gradually , at last the frame rate keep about 60FPS, why?How can I record a video for 240FPS with filters? The time of every frame received in AVCaptureVideoDataOutputSampleBufferDelegateas below.{136730920270041/1000000000 = 136730.920}{136730924439541/1000000000 = 136730.924}{136730928608833/1000000000 = 136730.929}{136730932778416/1000000000 = 136730.933}{136730936947791/1000000000 = 136730.937}{136730941117166/1000000000 = 136730.941}{136730945286666/1000000000 = 136730.945}{136730949456125/1000000000 = 136730.949}{136730953625416/1000000000 = 136730.954}{136730957794958/1000000000 = 136730.958}{136730961964541/1000000000 = 136730.962}{136730966133833/1000000000 = 136730.966}{136730970303416/1000000000 = 136730.970}{136730974472833/1000000000 = 136730.974}{136731191283708/1000000000 = 136731.191}{136731207961375/1000000000 = 136731.208}{136731278841791/1000000000 = 136731.279}{136731295519625/1000000000 = 136731.296}{136731316366750/1000000000 = 136731.316}{136731333044749/1000000000 = 136731.333}{136731349722290/1000000000 = 136731.350}{136731366400207/1000000000 = 136731.366}{136731383077916/1000000000 = 136731.383}{136731399755750/1000000000 = 136731.400}{136731416433374/1000000000 = 136731.416}{136731433111082/1000000000 = 136731.433}{136731449789000/1000000000 = 136731.450}{136731466466583/1000000000 = 136731.466}{136731483144540/1000000000 = 136731.483}{136731499822207/1000000000 = 136731.500}{136731516499999/1000000000 = 136731.516}{136731533177666/1000000000 = 136731.533}{136731549855500/1000000000 = 136731.550}{136731566533374/1000000000 = 136731.567}{136731583211040/1000000000 = 136731.583}{136731599888833/1000000000 = 136731.600}{136731616566500/1000000000 = 136731.617}{136731633244374/1000000000 = 136731.633}
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by Cerko.
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