FFMPEG仅设置视频间隔的比特率上限

我如何在0~1min30之间，从1分30~3分钟到2048分钟到40分钟之间定义500k到1024k的可变比特率，从3分钟到最终结束再分为500~1024？

video ffmpeg

— Lorrys Anders
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